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Cheap flights from Seattle to Ontario from C$ 58

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 24/12. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ONT
13 Oct — 20 Oct1
1 adult

The best prices from Seattle/Tacoma Intl to Ontario are usually found in September or August, booked 72 days in advance, depart on a Monday or Friday and return on a Monday

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 8 October 2024.

Round-trip from

C$ 126

One-way from

C$ 58

Popular in

December

Cheapest in

September
Frontier
  • Frontier
  • 14/11-16/11
  • 1 total stop
  • 12h 16m total
  • Seattle to Ontario
Search Deals
Frontier
  • Frontier
  • 24/12
  • Nonstop
  • 2h 38m total
  • Seattle to Ontario
Search Deals
High demand for flights, 25% potential price rise
Search Deals
Best time to find cheap flights, 34% potential price drop
Search Deals

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 539,253 searches. Data last updated 8 October 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.
Thu 14/1110:11 p.m.SEA - ONT
1 stop9h 20mFrontier
Sat 16/1112:38 p.m.ONT - SEA
Nonstop2h 56mFrontier
Deal found 8/10C$ 126
Fri 11/107:27 p.m.SEA - ONT
Nonstop2h 42mFrontier
Mon 14/1011:00 a.m.ONT - SEA
Nonstop2h 43mFrontier
Deal found 7/10C$ 436

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 539,253 searches. Data last updated 8 October 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.
Sat 9/115:30 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Wed 13/114:15 p.m.ONT - SEA
Nonstop2h 45mAlaska Airlines
Deal found 7/10C$ 185
Mon 21/109:26 p.m.SEA - ONT
Nonstop2h 32mAlaska Airlines
Tue 22/107:30 a.m.ONT - SEA
Nonstop2h 48mAlaska Airlines
Deal found 7/10C$ 343

Cheap Seattle to Ontario flights in October & November 2024

Find cheap flight options from Seattle to Ontario specifically for the months of October and November 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 539,253 searches. Prices were last updated on 8 October 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.
Thu 14/1110:11 p.m.SEA - ONT
1 stop9h 20mFrontier
Sat 16/1112:38 p.m.ONT - SEA
Nonstop2h 56mFrontier
Deal found 8/10C$ 126
Sat 9/115:30 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Wed 13/114:15 p.m.ONT - SEA
Nonstop2h 45mAlaska Airlines
Deal found 7/10C$ 185
Sat 9/117:55 p.m.SEA - ONT
Nonstop2h 44mDelta
Wed 13/115:25 p.m.ONT - SEA
Nonstop3h 02mDelta
Deal found 8/10C$ 186
Fri 29/115:36 a.m.SEA - ONT
1 stop4h 17mUnited Airlines
Tue 3/126:00 a.m.ONT - SEA
1 stop6h 58mUnited Airlines
Deal found 8/10C$ 253
Sat 9/111:00 p.m.SEA - ONT
2 stops7h 45mSouthwest
Mon 11/115:45 a.m.ONT - SEA
1 stop4h 45mSouthwest
Deal found 7/10C$ 423

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 539,253 searches. Data last updated 8 October 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.
Thu 14/1110:11 p.m.SEA - ONT
1 stop9h 20mFrontier
Sat 16/1112:38 p.m.ONT - SEA
Nonstop2h 56mFrontier
Deal found 8/10C$ 126
Sat 9/115:30 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Wed 13/114:15 p.m.ONT - SEA
Nonstop2h 45mAlaska Airlines
Deal found 7/10C$ 185
Sat 2/117:55 p.m.SEA - ONT
Nonstop2h 44mDelta
Sun 3/115:15 a.m.ONT - SEA
Nonstop2h 55mDelta
Deal found 7/10C$ 227
Fri 29/115:36 a.m.SEA - ONT
1 stop4h 17mUnited Airlines
Tue 3/126:00 a.m.ONT - SEA
1 stop6h 58mUnited Airlines
Deal found 8/10C$ 253
Sat 9/111:00 p.m.SEA - ONT
2 stops7h 45mSouthwest
Mon 11/115:45 a.m.ONT - SEA
1 stop4h 45mSouthwest
Deal found 7/10C$ 423

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 539,253 searches. Data last updated 8 October 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 14/117:20 p.m.SEA - ONT
Nonstop2h 40mFrontier
Sat 16/1112:38 p.m.ONT - SEA
Nonstop2h 56mFrontier
Deal found 8/10C$ 131
Sat 9/115:30 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Wed 13/114:15 p.m.ONT - SEA
Nonstop2h 45mAlaska Airlines
Deal found 7/10C$ 185
Sat 2/117:55 p.m.SEA - ONT
Nonstop2h 44mDelta
Sun 3/115:15 a.m.ONT - SEA
Nonstop2h 55mDelta
Deal found 7/10C$ 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 539,253 searches. Data last updated 8 October 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.
Tue 22/107:40 a.m.SEA - ONT
Nonstop2h 51mDelta
Wed 23/105:26 p.m.ONT - SEA
Nonstop2h 57mDelta
Deal found 7/10C$ 322
Mon 21/109:26 p.m.SEA - ONT
Nonstop2h 32mAlaska Airlines
Tue 22/107:30 a.m.ONT - SEA
Nonstop2h 48mAlaska Airlines
Deal found 7/10C$ 343
Fri 11/107:27 p.m.SEA - ONT
Nonstop2h 42mFrontier
Mon 14/1011:00 a.m.ONT - SEA
Nonstop2h 43mFrontier
Deal found 7/10C$ 436
Tue 15/104:26 p.m.SEA - ONT
1 stop6h 30mUnited Airlines
Wed 16/107:18 a.m.ONT - SEA
1 stop4h 24mUnited Airlines
Deal found 7/10C$ 465
Thu 17/106:15 a.m.SEA - ONT
1 stop10h 30mSouthwest
Sun 20/1012:20 p.m.ONT - SEA
1 stop7h 55mSouthwest
Deal found 7/10C$ 491

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 539,253 searches. Data last updated 8 October 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 24/127:01 p.m.SEA - ONT
Nonstop2h 38mFrontier
Deal found 6/10C$ 58
Sat 1/33:45 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Deal found 7/10C$ 94
Wed 6/117:40 a.m.SEA - ONT
Nonstop2h 51mDelta
Deal found 7/10C$ 107
Sat 23/114:35 p.m.SEA - ONT
1 stop5h 48mUnited Airlines
Deal found 8/10C$ 120
Sat 7/125:30 a.m.SEA - ONT
1 stop6h 45mSouthwest
Deal found 7/10C$ 174

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 539,253 searches. Data last updated 8 October 2024.

Fly from

Any airport

Fly to

Any airport

Budget

C$ 126 - C$ 416

Route

Depart

Return

Price

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Thu 14/11

1 stop9h 20m

Ontario

Sat 16/11

Nonstop2h 56m

C$ 126

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 9/11

Nonstop2h 33m

Ontario

Wed 13/11

Nonstop2h 45m

C$ 185

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Wed 30/10

Nonstop2h 51m

Ontario

Wed 6/11

Nonstop2h 55m

C$ 207

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Wed 30/10

1 stop4h 27m

Ontario

Wed 30/10

1 stop5h 16m

C$ 321

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Mon 23/12

1 stop6h 35m

Ontario

Sun 29/12

1 stop9h 50m

C$ 416

Flights are sorted by cheapest first

Deals found on 8/10

Best time to book a flight from Seattle to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Seattle to Ontario

Get recent, data-driven insights about flights from Seattle to Ontario including ideal travel times, pricing trends, and more.

How far ahead should I 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 4 October 2024.

Booking 72 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.

Find deals

What is the cheapest month to book a flight from Seattle to Ontario?

Currently, September is the cheapest month in which you can book a flight from Seattle to Ontario (average of C$ 290). Flying from Seattle to Ontario in May is currently the most expensive (average of C$ 569). 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.

What is the cheapest time of day to fly from SEA to ONT?

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 8 October 2024.

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 61% on airfare.

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 8 October 2024.

The most flights from SEA to ONT are scheduled on a Monday (12 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 on average).

Rainfall in Ontario by month

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

In terms of precipitation, rainfall in Ontario ranges from 3.0 - 86.0 mm per month. February is typically the wettest month, when rainfall can reach 86.0 mm. June is typically the driest time to visit Ontario when rainfall is around 3.0 mm.

Temperature in Ontario by month

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

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 26.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 12.0 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 8 October 2024.
Read reviews from past customers who have flown Frontier, Alaska Airlines and United Airlines 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.
Southwest
8.2
Very good
5,223 reviews
Check prices

Boarding

8.3

Crew

8.7

Comfort

8.1

Overall

8.2

Entertainment

7.7

Food

7.2

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Southwest
8.2
Very good
5,223 reviews
Southwest
8.2
Very good
5,223 reviews
Check prices

Boarding

8.3

Crew

8.7

Comfort

8.1

Overall

8.2

Entertainment

7.7

Food

7.2

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Alaska Airlines
8.0
Very good
9,388 reviews
Southwest
8.2
Very good
5,223 reviews
Check prices

Boarding

8.3

Crew

8.7

Comfort

8.1

Overall

8.2

Entertainment

7.7

Food

7.2

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Delta
8.0
Very good
8,972 reviews
Southwest
8.2
Very good
5,223 reviews
Check prices

Boarding

8.3

Crew

8.7

Comfort

8.1

Overall

8.2

Entertainment

7.7

Food

7.2

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

United Airlines
7.4
Good
9,370 reviews
Southwest
8.2
Very good
5,223 reviews
Check prices

Boarding

8.3

Crew

8.7

Comfort

8.1

Overall

8.2

Entertainment

7.7

Food

7.2

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Frontier
6.1
Okay
3,651 reviews
Southwest
8.2
Very good
5,223 reviews
Check prices

Boarding

8.3

Crew

8.7

Comfort

8.1

Overall

8.2

Entertainment

7.7

Food

7.2

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

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 28m on average. When it comes time to book airfare, you have a few options: there are 9 outbound flights from Seattle/Tacoma Intl to Ontario offered by 3 different airlines.

  • How popular is this Seattle to Ontario flight route?

    Within the past month, 41 users have taken a look at flights from Seattle/Tacoma Intl to Ontario.

  • 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$ 126. Other airlines that can offer you cheap pricing are Alaska Airlines, from C$ 185, and Delta, from C$ 207. Frontier is currently priced 54% below the average price you’ll pay for this route.

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

    C$ 58 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Alaska Airlines and Delta, with prices starting from C$ 94 and C$ 107, 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: Horizon Air (100%), Virgin Atlantic (94%), KLM (92%).

  • 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$ 164, our data indicates the cheapest price to be C$ 79. The most popular route (Seattle/Tacoma Intl - Ontario), is priced around C$ 155.

  • 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 find direct flights from Seattle to Ontario.

  • 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.

  • What is the cheapest month to book a flight from Seattle to Ontario?

    Currently, September is the cheapest month in which you can book a flight from Seattle to Ontario (average of C$ 290). Flying from Seattle to Ontario in May is currently the most expensive (average of C$ 569). 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.

See more FAQs

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Top 3 airlines flying from Seattle to Ontario

Discover the top 3 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 539,253 searches. Data last updated 8 October 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapestC$ 78AverageC$ 133FlexibilityNo cancel feeOn-time62%
Search Frontier flights
Alaska AirlinesCheapestC$ 160AverageC$ 261FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
DeltaCheapestC$ 185AverageC$ 294FlexibilityNo cancel feeOn-timeN/A
Search Delta 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!

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