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Cheap flights from Seattle to Ontario from C$ 68

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 23/4. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
SEA — ONT
2 Apr — 9 Apr1
1 adult
Tue 2/4
Tue 9/4

Cheap flight deals from Seattle to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 28 March 2024.

Popular in

November

Cheapest in

September

Round-trip from

C$ 338

One-way from

C$ 107
High demand for flights, 11% potential price rise
Best time to find cheap flights, 22% potential price drop
From Seattle/Tacoma Intl to Ontario
One-way flight from Seattle/Tacoma Intl to Ontario

What is the cheapest day to fly round-trip from Seattle to Ontario?

Thursday flights are generally found to be more expensive for flights from Seattle to Ontario. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Ontario.

How far in advance should I book a flight from Seattle to Ontario?

To save on the cost of your flight from Seattle to Ontario, book at least 56 days before your planned departure. Booking around this time can save you about 87% on the cost of this flight compared to booking a flight leaving this week. We have found prices from C$ 379 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as C$ 548.

What is the cheapest month to fly from Seattle to Ontario?

September can be a great time to fly to Ontario from Seattle with a flight ticket averaging about C$ 307. Cheapflights users have found deals in the month of September for as cheap as C$ 94. The most expensive prices can be found in the month of December.

When is the cheapest time to fly from Seattle to Ontario (SEA - ONT)?

One of the essential ways to save on airfare from Seattle to Ontario is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight at noon could potentially save you up to 24% on airfare.

Cheap Frontier flights from Seattle to Ontario

Explore cheap flight options specifically provided by Frontier for the route between Seattle and Ontario. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 595,463 searches. Data last updated 28 March 2024.
Peruse some of the lowest-priced Frontier flights we've found from Seattle to Ontario. Come back soon if you're not finding the exact deal you're looking for.
Sat 1/69:00 a.m.SEA - ONT
1 stop7h 02mFrontier
Sun 2/610:34 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 27/3C$ 143
Sat 1/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Sun 2/610:34 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 27/3C$ 144
Sat 1/610:22 a.m.SEA - ONT
2 stops20h 17mFrontier
Sun 2/610:34 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 27/3C$ 236
Tue 16/49:35 p.m.SEA - ONT
1 stop8h 51mFrontier
Wed 17/412:59 a.m.ONT - SEA
1 stop20h 20mFrontier
Deal found 27/3C$ 270
Thu 29/81:53 p.m.SEA - ONT
Nonstop2h 37mFrontier
Sun 1/910:06 a.m.ONT - SEA
Nonstop2h 47mFrontier
Deal found 27/3C$ 283
Tue 2/79:37 a.m.SEA - ONT
1 stop14h 02mFrontier
Tue 9/79:35 a.m.ONT - SEA
Nonstop2h 47mFrontier
Deal found 26/3C$ 289
Fri 19/410:34 p.m.SEA - ONT
1 stop7h 52mFrontier
Sun 21/47:29 p.m.ONT - SEA
2 stops11h 51mFrontier
Deal found 27/3C$ 326
Sat 1/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Sat 1/612:59 a.m.ONT - SEA
1 stop19h 40mFrontier
Deal found 27/3C$ 351
Fri 19/48:30 p.m.SEA - ONT
1 stop25h 28mFrontier
Sat 20/412:59 a.m.ONT - SEA
1 stop20h 41mFrontier
Deal found 27/3C$ 371

Cheap Alaska Airlines flights from Seattle to Ontario

Explore cheap flight options specifically provided by Alaska Airlines for the route between Seattle and Ontario. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 595,463 searches. Data last updated 28 March 2024.
Some of the lowest-priced Alaska Airlines flights we've found at this time heading from Seattle to Ontario. Ensure the flight price, dates, time, and airline match your criteria before you book.
Tue 30/46:55 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Thu 2/56:00 a.m.ONT - SEA
Nonstop2h 45mAlaska Airlines
Deal found 27/3C$ 200
Sat 27/46:55 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Tue 30/47:00 a.m.ONT - SEA
1 stop4h 41mAlaska Airlines
Deal found 26/3C$ 226
Wed 17/47:00 a.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Wed 24/46:00 a.m.ONT - SEA
Nonstop2h 45mAlaska Airlines
Deal found 27/3C$ 227
Sat 4/57:00 a.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Tue 14/57:00 a.m.ONT - SEA
1 stop4h 41mAlaska Airlines
Deal found 27/3C$ 232
Wed 24/46:55 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Wed 1/57:00 a.m.ONT - SEA
1 stop4h 41mAlaska Airlines
Deal found 27/3C$ 239
Sat 27/41:32 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Tue 30/46:00 a.m.ONT - SEA
Nonstop2h 45mAlaska Airlines
Deal found 26/3C$ 247
Wed 8/51:32 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Tue 14/57:00 a.m.ONT - SEA
1 stop4h 41mAlaska Airlines
Deal found 27/3C$ 253
Wed 24/46:55 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Wed 1/55:00 p.m.ONT - SEA
Nonstop2h 38mAlaska Airlines
Deal found 27/3C$ 261
Sat 11/56:55 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Sat 18/58:09 p.m.ONT - SEA
Nonstop2h 41mAlaska Airlines
Deal found 27/3C$ 268

Cheap Seattle to Ontario flights in March & April 2024

Find cheap flight options from Seattle to Ontario specifically for the months of March and April 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 595,463 searches. Prices were last updated on 28 March 2024.
Scroll through some of the best deals on flights from Seattle to Ontario in 2024. For more flight deals, be sure to check back very soon.
Tue 30/46:55 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Thu 2/56:00 a.m.ONT - SEA
Nonstop2h 45mAlaska Airlines
Deal found 27/3C$ 200
Tue 23/42:20 p.m.SEA - ONT
Nonstop2h 40mDelta
Sat 27/42:00 p.m.ONT - SEA
Nonstop2h 55mDelta
Deal found 26/3C$ 213
Sat 27/46:55 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Tue 30/47:00 a.m.ONT - SEA
1 stop4h 41mAlaska Airlines
Deal found 26/3C$ 226
Wed 17/47:00 a.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Wed 24/46:00 a.m.ONT - SEA
Nonstop2h 45mAlaska Airlines
Deal found 27/3C$ 227
Thu 18/49:26 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Thu 25/47:00 a.m.ONT - SEA
1 stop5h 42mAlaska Airlines
Deal found 27/3C$ 239
Sat 27/41:32 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Tue 30/46:00 a.m.ONT - SEA
Nonstop2h 45mAlaska Airlines
Deal found 26/3C$ 247
Wed 24/46:55 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Wed 1/55:00 p.m.ONT - SEA
Nonstop2h 38mAlaska Airlines
Deal found 27/3C$ 261
Tue 16/49:35 p.m.SEA - ONT
1 stop8h 51mFrontier
Wed 17/412:59 a.m.ONT - SEA
1 stop20h 20mFrontier
Deal found 27/3C$ 270
Fri 19/47:00 a.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Thu 25/47:00 a.m.ONT - SEA
1 stop5h 42mAlaska Airlines
Deal found 27/3C$ 273

Seattle to Ontario 2024 flight deals

Discover exclusive flight deals for travel between Seattle and Ontario in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 595,463 searches. Data last updated 28 March 2024.
Scroll through some of the best deals on flights from Seattle to Ontario in 2024. For more flight deals, be sure to check back very soon.
Sat 18/51:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Tue 21/510:04 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 27/3C$ 92
Thu 16/52:32 p.m.SEA - ONT
Nonstop2h 44mFrontier
Tue 21/510:04 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 27/3C$ 106
Sat 18/51:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Sun 19/510:32 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 27/3C$ 111
Thu 16/52:32 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 20/510:14 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 27/3C$ 121
Thu 16/52:32 p.m.SEA - ONT
Nonstop2h 44mFrontier
Sun 19/510:32 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 27/3C$ 126
Sat 18/59:00 a.m.SEA - ONT
1 stop7h 02mFrontier
Sun 19/510:32 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 27/3C$ 137
Sat 1/69:00 a.m.SEA - ONT
1 stop7h 02mFrontier
Sun 2/610:34 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 27/3C$ 143
Sat 1/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Sun 2/610:34 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 27/3C$ 144
Wed 15/59:55 a.m.SEA - ONT
1 stop12h 05mFrontier
Tue 21/510:04 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 27/3C$ 152

Direct flights to Ontario from Seattle

Discover non-stop flight options from Seattle to Ontario. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 595,463 searches. Data last updated 28 March 2024.
Take a look at some of the direct flights travelling from Seattle to Ontario in the near future. Search for alternative flights from Seattle to Ontario by utilizing the search form above.
Thu 16/52:32 p.m.SEA - ONT
Nonstop2h 44mFrontier
Tue 21/510:04 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 27/3C$ 106
Sat 18/51:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Sun 19/510:32 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 27/3C$ 111
Thu 16/52:32 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 20/510:14 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 27/3C$ 121
Thu 16/52:32 p.m.SEA - ONT
Nonstop2h 44mFrontier
Sun 19/510:32 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 27/3C$ 126
Sat 1/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Sun 2/610:34 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 27/3C$ 144
Tue 30/46:55 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Thu 2/56:00 a.m.ONT - SEA
Nonstop2h 45mAlaska Airlines
Deal found 27/3C$ 200
Tue 23/47:55 a.m.SEA - ONT
Nonstop2h 45mDelta
Sat 27/45:40 p.m.ONT - SEA
Nonstop2h 53mDelta
Deal found 28/3C$ 213
Sat 4/57:55 a.m.SEA - ONT
Nonstop2h 44mDelta
Tue 14/56:50 a.m.ONT - SEA
Nonstop3h 00mDelta
Deal found 27/3C$ 220
Wed 17/46:55 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Wed 24/46:00 a.m.ONT - SEA
Nonstop2h 45mAlaska Airlines
Deal found 27/3C$ 227

Seattle to Ontario flights leaving soon

Find last-minute flight options from Seattle to Ontario for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 595,463 searches. Data last updated 28 March 2024.
Users seeking a last-minute flight from Seattle to Ontario should consider booking one of these fares. Users should be sure to double check the price, date, and time of their last-minute flight.
Thu 4/42:55 p.m.SEA - ONT
1 stop6h 57mAlaska Airlines
Wed 17/46:00 a.m.ONT - SEA
Nonstop2h 45mAlaska Airlines
Deal found 27/3C$ 334
Wed 3/46:47 a.m.SEA - ONT
Nonstop2h 38mAlaska Airlines
Wed 10/46:00 a.m.ONT - SEA
Nonstop2h 50mAlaska Airlines
Deal found 27/3C$ 390
Wed 3/46:47 a.m.SEA - ONT
Nonstop2h 38mAlaska Airlines
Wed 10/46:30 a.m.ONT - SEA
1 stop3h 52mAlaska Airlines
Deal found 27/3C$ 402
Wed 3/411:22 a.m.SEA - ONT
1 stop6h 20mAlaska Airlines
Wed 10/46:30 a.m.ONT - SEA
1 stop3h 52mAlaska Airlines
Deal found 27/3C$ 416
Thu 4/42:55 p.m.SEA - ONT
1 stop6h 57mAlaska Airlines
Mon 8/47:59 p.m.ONT - SEA
Nonstop2h 49mAlaska Airlines
Deal found 27/3C$ 429
Thu 4/49:25 p.m.SEA - ONT
Nonstop2h 34mAlaska Airlines
Wed 10/45:32 p.m.ONT - SEA
Nonstop2h 49mAlaska Airlines
Deal found 27/3C$ 438
Thu 4/42:55 p.m.SEA - ONT
1 stop6h 57mAlaska Airlines
Mon 8/46:30 a.m.ONT - SEA
1 stop6h 12mAlaska Airlines
Deal found 27/3C$ 443
Thu 4/49:25 p.m.SEA - ONT
Nonstop2h 34mAlaska Airlines
Wed 10/46:30 a.m.ONT - SEA
1 stop3h 52mAlaska Airlines
Deal found 27/3C$ 450
Thu 4/49:25 p.m.SEA - ONT
Nonstop2h 34mAlaska Airlines
Mon 8/45:32 p.m.ONT - SEA
Nonstop2h 49mAlaska Airlines
Deal found 27/3C$ 465

One-way flights to Ontario from Seattle

Search for one-way flight options from Seattle to Ontario. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 595,463 searches. Data last updated 28 March 2024.
Take a look at some of the best available options we've come across on one-way flights from Seattle to Ontario. Users needing a return flight from Seattle to Ontario should utilize the search form above.
Tue 23/49:35 p.m.SEA - ONT
1 stop8h 51mFrontier
Deal found 27/3C$ 68
Sat 27/47:55 a.m.SEA - ONT
Nonstop2h 45mDelta
Deal found 27/3C$ 101
Thu 25/410:04 p.m.SEA - ONT
1 stop8h 22mFrontier
Deal found 27/3C$ 107
Mon 22/49:26 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Deal found 27/3C$ 114
Wed 8/57:00 a.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Deal found 26/3C$ 121
Thu 25/47:00 a.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Deal found 27/3C$ 148
Mon 27/59:26 p.m.SEA - ONT
Nonstop2h 32mAlaska Airlines
Deal found 27/3C$ 162
Sun 26/54:25 p.m.SEA - ONT
1 stop5h 30mAlaska Airlines
Deal found 27/3C$ 174
Wed 10/410:30 a.m.SEA - ONT
Nonstop2h 42mDelta
Deal found 27/3C$ 182

Find flights from Seattle to Ontario within your budget

Customize your flight search to find flights from Seattle to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 595,463 searches. Data last updated 28 March 2024.

Fly from

Any airport

Fly to

Any airport

Budget

C$ 143 - C$ 241

Route

Depart

Return

Price

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 1/6

1 stop7h 02m

Ontario

Sun 2/6

Nonstop2h 53m

C$ 143

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 1/6

Nonstop2h 44m

Ontario

Sun 2/6

Nonstop2h 53m

C$ 144

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 30/4

Nonstop2h 33m

Ontario

Thu 2/5

Nonstop2h 45m

C$ 200

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 23/4

Nonstop2h 45m

Ontario

Thu 2/5

Nonstop2h 54m

C$ 213

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 4/5

Nonstop2h 44m

Ontario

Tue 14/5

Nonstop3h 00m

C$ 220

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 27/4

Nonstop2h 33m

Ontario

Tue 30/4

1 stop4h 41m

C$ 226

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Wed 17/4

Nonstop2h 33m

Ontario

Wed 24/4

Nonstop2h 45m

C$ 227

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 1/6

2 stops20h 17m

Ontario

Sun 2/6

Nonstop2h 53m

C$ 236

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 11/5

Nonstop2h 39m

Ontario

Sat 18/5

Nonstop3h 02m

C$ 241

Flights are sorted by cheapest first

Deals found on 27/3

When is the best time to book a flight from Seattle to Ontario?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Ontario. Price data was last updated on 28 January 2024.
Booking 53 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Search Deals

When is the cheapest time to fly from Seattle to Ontario?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Ontario. Price data was last updated on 24 March 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Seattle to Ontario flight should consider departing on Saturday mornings when fares are most often at their lowest. Friday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Average price of flights to Ontario by month

Plan your trip from Seattle to Ontario by taking into account the cheapest months to travel. The average price of a one-way flight from Seattle to Ontario is currently C$ 131 while a round-trip flight costs C$ 205. Price data was last updated on 24 March 2024.

Currently, September is the cheapest month in which you can book a flight from Seattle to Ontario (average of C$ 241). Flying from Seattle to Ontario in August is currently the most expensive (average of C$ 539). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

January

C$ 412

February

C$ 466

March

C$ 497

April

C$ 558

May

C$ 715

June

C$ 670

July

C$ 632

August

C$ 732

September

C$ 327

October

C$ 515

November

C$ 651

December

C$ 519

Temperature and rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average temperature and rainfall totals by month.

LAX

Temperature

14 - 23 °C

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated 28 March 2024.
Read reviews from past customers who have flown Frontier, Alaska Airlines and Delta from Seattle to Ontario. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
8.1
Very good
9,127 reviews

Comfort

7.9

Crew

8.6

Boarding

8.2

Food

7.3

Entertainment

7.4

Overall

8.1

Reviews

1 / 10

I paid for an aisle seat and found I was bumped to the middle seat. No entertainment at all, bathroom was so tiny, a woman had a hard time in there. Seems it was considered for men only. This was my first time on Alaska airlines. I don’t think I want to fly on Alaska Airlines again.

8.1
Very good
9,127 reviews
8.1
Very good
9,127 reviews

Comfort

7.9

Crew

8.6

Boarding

8.2

Food

7.3

Entertainment

7.4

Overall

8.1

Reviews

1 / 10

I paid for an aisle seat and found I was bumped to the middle seat. No entertainment at all, bathroom was so tiny, a woman had a hard time in there. Seems it was considered for men only. This was my first time on Alaska airlines. I don’t think I want to fly on Alaska Airlines again.

8.1
Very good
11,418 reviews
8.1
Very good
9,127 reviews

Comfort

7.9

Crew

8.6

Boarding

8.2

Food

7.3

Entertainment

7.4

Overall

8.1

Reviews

1 / 10

I paid for an aisle seat and found I was bumped to the middle seat. No entertainment at all, bathroom was so tiny, a woman had a hard time in there. Seems it was considered for men only. This was my first time on Alaska airlines. I don’t think I want to fly on Alaska Airlines again.

7.4
Good
11,481 reviews
8.1
Very good
9,127 reviews

Comfort

7.9

Crew

8.6

Boarding

8.2

Food

7.3

Entertainment

7.4

Overall

8.1

Reviews

1 / 10

I paid for an aisle seat and found I was bumped to the middle seat. No entertainment at all, bathroom was so tiny, a woman had a hard time in there. Seems it was considered for men only. This was my first time on Alaska airlines. I don’t think I want to fly on Alaska Airlines again.

6.3
Okay
4,267 reviews
8.1
Very good
9,127 reviews

Comfort

7.9

Crew

8.6

Boarding

8.2

Food

7.3

Entertainment

7.4

Overall

8.1

Reviews

1 / 10

I paid for an aisle seat and found I was bumped to the middle seat. No entertainment at all, bathroom was so tiny, a woman had a hard time in there. Seems it was considered for men only. This was my first time on Alaska airlines. I don’t think I want to fly on Alaska Airlines again.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • What airports do I use to fly from Seattle to Ontario?

    To fly from Seattle to Ontario, you need to book a flight from Seattle/Tacoma Intl (SEA) to Ontario (ONT). Nonstop flights to Ontario from Seattle/Tacoma Intl take 2h 27m on average. When it comes time to book airfare, you have a few options: there are 13 outbound flights from Seattle/Tacoma Intl to Ontario offered by 2 different airlines.

  • Can I find flights from Seattle to Ontario for under C$ 200 on Cheapflights?

    Yes, there are multiple flights from Seattle to Ontario for under C$ 200. The cheapest flight booked recently is on Frontier for just C$ 143, but on average you can expect to pay C$ 236.

  • Are there direct flights from Seattle to Ontario for under C$ 200 on Cheapflights?

    Cheapflights has 20 direct flights from Seattle to Ontario under C$ 200. A good price for a direct flight from Seattle to Ontario is less than C$ 227.

  • Are there last-minute flights available from Seattle to Ontario for under C$ 400?

    There are currently 20+ open flights from Seattle to Ontario within the next 7 days for less than C$ 400.

  • What days are direct flights available from Seattle to Ontario?

    Direct flights can be found on the following days: Sunday, Monday, Tuesday, Thursday, Friday.

  • How popular is this Seattle to Ontario flight route?

  • How many flights depart from Seattle to Ontario on average per day?

    Per day, 13 flights depart from Seattle to Ontario on average.
    Morning (6am - Midday) - 8% of flight departures
    Afternoon (Noon - 6pm) - 31% of flight departures
    Evening (6pm - Midnight) - 62% of flight departures

  • How long is the flight from Seattle to Ontario?

    For as low as C$ 143, Frontier can have you in Ontario from Seattle in 2h 33m. Seattle and Ontario are separated by a distance of 1548 km. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Seattle to Ontario round-trip?

    Cheapflights users have booked flights from Seattle to Ontario round-trip from C$ 143. Other airlines that can offer you cheap pricing are Alaska Airlines, from C$ 200, and Delta, from C$ 213. Frontier is currently priced 50% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from Seattle to Ontario one-way?

    C$ 68 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Delta and Alaska Airlines, with prices starting from C$ 101 and C$ 114, respectively.

  • What are the most reliable airlines from Seattle to Ontario?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Seattle to Ontario on time: WestJet (100%), Korean Air (96%), Virgin Atlantic (89%).

  • What are the cheapest flights from Seattle to Ontario?

    Looking for the cheapest flight from Seattle to Ontario? While on average our users pay C$ 296, our data indicates the cheapest price to be C$ 98. The most popular route (Seattle/Tacoma Intl - Ontario), is priced around C$ 174.

  • What does SEA to ONT mean?

    This is defined as Seattle/Tacoma Intl Airport (SEA) and Ontario Airport (ONT). Codes like Ontario Airport are often used to just call airports uniquely.

  • Can I find deals for flights from Seattle to Ontario that include extra baggage allowance?

    The amount of baggage you can bring depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Seattle to Ontario with specific airlines?

    Yes, Cheapflights allows you to browse and filter flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Seattle to Ontario that include hotel bookings?

    Yes. In addition to deals on Seattle to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to see available direct flights.

  • Can I find deals for business class flights from Seattle to Ontario?

    Yes. Cheapflights offers flight deals from Seattle to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Seattle to Ontario that allow pets onboard?

    Many airlines do offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • How recently were the Seattle to Ontario flight deals updated?

    The Seattle to Ontario flight deals you see on this page were last updated on 27/3.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from Seattle to Ontario

Discover the top 2 airlines that operate flights from Seattle to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 595,463 searches. Data last updated 28 March 2024.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 117AverageC$ 284FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapestC$ 160AverageC$ 271FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

Search flights from Seattle to Ontario by cabin class

Find flights from Seattle to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Hourly flight availability from Seattle to Ontario

Find hourly flight availability from Seattle to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 28 March 2024.
6%of flight departuresEarly morningMidnight to 6 am
20%of flight departuresMorning6 am to noon
32%of flight departuresAfternoonNoon to 6 pm
42%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from Seattle to Ontario

Explore weekly flight availability from Seattle to Ontario. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 28 March 2024.
Sunday15daily flights
Monday16daily flights
Tuesday11daily flights
Wednesday10daily flights
Thursday14daily flights
Friday16daily flights
Saturday13daily flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Seattle to Ontario?

When you search for this flight from Seattle to Ontario, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Ontario?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Seattle to Ontario.

Can Cheapflights find flights from Seattle to Ontario with no change fees?

Yes! Cheapflights helps users easily find flights from Seattle to Ontario with no change fees.

Can Cheapflights notify me if prices for flights from Seattle to Ontario become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

Can I find deals on last-minute flights from Seattle to Ontario?

Yes, you can often find last-minute deals on Seattle to Ontario flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

How can I compare prices from different travel booking sites for flights from Seattle to Ontario?

Cheapflights aggregates prices from various travel booking sites. This allows you to compare prices and choose the best deal.

Can I find deals for flights from Seattle to Ontario that offer flexible cancellation policies?

Cancellation policies vary by airline and fare type. After entering your flight details, you can view the cancellation policies for each deal in the search results. Some deals may offer flexibility in terms of cancellation and changes.

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