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Cheap flights from Seattle to Toronto from C$ 148

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 18/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YTO
17 Jun — 24 Jun1
1 adult

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Toronto are usually found in January or February, booked 87 days in advance, depart on a Thursday or Sunday and return on a Thursday

Cheap flight deals from Seattle to Toronto

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Toronto (YTO). 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 12 June 2025.

Round-trip from

C$ 324

One-way from

C$ 148

Popular in

June

Cheapest in

January

Average price

C$ 718

Good round-trip deal

C$ 511 or less

Good one-way deal

C$ 275 or less
WestJet
  • WestJet
  • 3/8-18/8
  • 2 total stops
  • 17h 34m total
  • Seattle to Toronto
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WestJet
  • WestJet
  • 18/7
  • 1 total stop
  • 7h 51m total
  • Seattle to Toronto
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Highest demand for flights based on searches. 13% potential increase in price (C$ 122 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 20 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to Toronto (YTO).
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Price to beat on a one-way flight from Seattle/Tacoma Intl to Toronto (YTO).
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Find flight deals from Seattle to Toronto

Cheapest flights from Seattle to Toronto
Explore the most affordable flight options available from Seattle to Toronto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 June 2025.

Sun 3/82:05 p.m.SEA - YHM
1 stop7h 36mWestJet
Mon 18/86:00 a.m.YHM - SEA
1 stop9h 58mWestJet
Deal found 10/6C$ 324
Fri 25/78:40 a.m.SEA - YYZ
2 stops12h 53mWestJet
Tue 29/79:00 a.m.YYZ - SEA
2 stops13h 14mWestJet
Deal found 10/6C$ 383
Thu 31/71:50 p.m.SEA - YKF
1 stop7h 56mWestJet
Thu 7/87:45 p.m.YKF - SEA
2 stops19h 46mWestJet
Deal found 11/6C$ 383
Tue 15/77:17 a.m.SEA - YYZ
Nonstop4h 43mAlaska Airlines
Fri 18/74:45 p.m.YYZ - SEA
Nonstop5h 24mAlaska Airlines
Deal found 10/6C$ 391
Fri 26/97:15 a.m.SEA - YTZ
1 stop9h 34mAir Canada
Tue 30/912:25 p.m.YTZ - SEA
1 stop10h 06mAir Canada
Deal found 12/6C$ 396
Fri 7/112:07 p.m.SEA - YYZ
1 stop6h 52mUnited Airlines
Fri 14/115:55 p.m.YYZ - SEA
1 stop10h 04mUnited Airlines
Deal found 10/6C$ 412
Mon 4/82:55 p.m.SEA - YYZ
2 stops12h 14mAir Canada
Mon 18/86:15 a.m.YYZ - SEA
2 stops11h 01mAir Canada
Deal found 12/6C$ 413
Fri 17/103:39 p.m.SEA - YKF
2 stops10h 36mMultiple Airlines
Mon 20/106:00 a.m.YKF - SEA
1 stop9h 59mMultiple Airlines
Deal found 10/6C$ 413
Mon 4/87:05 a.m.SEA - YYZ
1 stop7h 17mMultiple Airlines
Tue 19/84:45 p.m.YYZ - SEA
Nonstop5h 24mMultiple Airlines
Deal found 10/6C$ 416
Mon 3/111:24 a.m.SEA - YYZ
1 stop7h 56mAmerican Airlines
Wed 12/116:20 p.m.YYZ - SEA
1 stop7h 55mAmerican Airlines
Deal found 11/6C$ 428
Mon 7/711:30 p.m.SEA - YYZ
1 stop9h 35mDelta
Sat 12/71:04 p.m.YYZ - SEA
1 stop10h 29mDelta
Deal found 11/6C$ 438
Wed 16/71:50 p.m.SEA - YHM
1 stop7h 51mMultiple Airlines
Tue 22/78:55 p.m.YHM - SEA
1 stop19h 03mMultiple Airlines
Deal found 11/6C$ 484

Cheapflights Fare Finder

Customize your flight search to find flights from Seattle to Toronto 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 629,999 searches. Data last updated 12 June 2025.
Use the filters below to find and compare flights from Seattle to Toronto that are best for you.

Fly from

Seattle

Fly to

Toronto

Route

Depart

Return

Price

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sun 3/8

2:05 p.m.-12:41 a.m.

1 stop7h 36m

Hamilton

Mon 18/8

6:00 a.m.-12:58 p.m.

1 stop9h 58m

C$ 324

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 25/7

8:40 a.m.-12:33 a.m.

2 stops12h 53m

Toronto Pearson Intl

Tue 29/7

9:00 a.m.-7:14 p.m.

2 stops13h 14m

C$ 383

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 31/7

1:50 p.m.-12:46 a.m.

1 stop7h 56m

Toronto Region of Waterloo Intl

Thu 7/8

7:45 p.m.-12:31 p.m.

2 stops19h 46m

C$ 383

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 15/7

7:17 a.m.-3:00 p.m.

Nonstop4h 43m

Toronto Pearson Intl

Fri 18/7

4:45 p.m.-7:09 p.m.

Nonstop5h 24m

C$ 391

SeattleToronto

SEA - YTZ

SEAYTZ

Seattle/Tacoma Intl

Fri 5/9

7:15 a.m.-7:49 p.m.

1 stop9h 34m

Toronto Island

Sun 7/9

12:25 p.m.-7:31 p.m.

1 stop10h 06m

C$ 396

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 7/11

2:07 p.m.-11:59 p.m.

1 stop6h 52m

Toronto Pearson Intl

Fri 14/11

5:55 p.m.-12:59 a.m.

1 stop10h 04m

C$ 412

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 4/8

2:55 p.m.-6:09 a.m.

2 stops12h 14m

Toronto Pearson Intl

Mon 18/8

6:15 a.m.-2:16 p.m.

2 stops11h 01m

C$ 413

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 4/8

7:35 p.m.-6:52 a.m.

1 stop8h 17m

Toronto Pearson Intl

Tue 19/8

4:45 p.m.-7:09 p.m.

Nonstop5h 24m

C$ 416

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sat 16/8

4:50 p.m.-5:15 a.m.

1 stop9h 25m

Toronto Region of Waterloo Intl

Sun 24/8

6:00 a.m.-12:58 p.m.

1 stop9h 58m

C$ 416

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 3/11

1:24 a.m.-12:20 p.m.

1 stop7h 56m

Toronto Pearson Intl

Wed 12/11

6:20 p.m.-11:15 p.m.

1 stop7h 55m

C$ 428

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/6

Showing 1-10 of 27 results
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Best time to book a flight from Seattle to Toronto

Have a flexible travel schedule? Discover the best time to fly to Toronto 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.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Toronto

How far ahead should I book a flight from Seattle to Toronto?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Toronto. Price data was last updated on 9 June 2025.

Booking 87 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Toronto. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, January is the cheapest month in which you can book a flight from Seattle to Toronto (average of C$ 167). Flying from Seattle to Toronto in July is currently the most expensive (average of C$ 255). 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 YTO?

Find hourly flight availability from Seattle to Toronto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 12 June 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 54% on flights from Seattle to Toronto by exploring options for tickets in the afternoon.

Weekly flight availability from Seattle to Toronto

Explore weekly flight availability from Seattle to Toronto. 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 12 June 2025.

The most flights from SEA to YTO are scheduled on a Tuesday (6 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (4 on average).

Rainfall in Toronto by month

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

In terms of precipitation, rainfall in Toronto ranges from 51.0 - 83.0 mm per month. June is typically the wettest month, when rainfall can reach 83.0 mm. February is typically the driest time to visit Toronto when rainfall is around 51.0 mm.

Temperature in Toronto by month

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

If weather is an important factor for your trip to Toronto, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 21.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -6.0 C).

Reviews of airlines servicing Toronto

Get insights into the airlines that provide service to Toronto. 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 Toronto. Reviews last updated 12 June 2025.
See what other customers who have flown with Alaska Airlines, Delta and United Airlines from Seattle to Toronto have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Delta
8.0
Very good
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
WestJet
7.2
Good
2,868 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Toronto. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Seattle to Toronto?

    Seattle/Tacoma Intl (SEA), located 18.4 km from the city centre, is the airport you fly out of when you book flights from Seattle to Toronto. 3 airlines have flights from Seattle/Tacoma Intl to Toronto on a regular basis. Booking flights from Seattle/Tacoma Intl to Toronto should not be difficult; the airport handles an average of 5 outbound flights to Toronto per day.

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

    According to our current data, WestJet (C$ 324), Alaska Airlines (C$ 391), and Air Canada (C$ 396) offers the cheapest pricing from Seattle to Toronto. You may be able to fly from Seattle to Toronto for 43% less than the average price by searching for these airlines.

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

    For one-way options, check prices for WestJet. According to our data, you can fly for as low as C$ 148. Users have also found prices from C$ 189 and C$ 202 on United Airlines and Air Canada, respectively.

  • What are the most popular routes from Seattle to Toronto?

    Most travellers choose Seattle/Tacoma Intl - Toronto Pearson Intl, Seattle/Tacoma Intl - Toronto Island or Seattle/Tacoma Intl - Toronto Region of Waterloo Intl when deciding on the best route from Seattle to Toronto.

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

    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 Toronto on time: Qatar Airways (93%), Alaska Airlines (92%), Hawaiian Airlines (92%).

  • What are the cheapest flights from Seattle to Toronto?

    On average you can expect to pay C$ 511 for a flight from Seattle to Toronto. The cheapest flight overall is C$ 183 while the most popular route, (Seattle/Tacoma Intl - Toronto Pearson Intl) is currently priced at C$ 335.

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

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

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

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Toronto.

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

    Yes. Cheapflights offers flight deals from Seattle to Toronto 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 Toronto?

    Currently, January is the cheapest month in which you can book a flight from Seattle to Toronto (average of C$ 167). Flying from Seattle to Toronto in July is currently the most expensive (average of C$ 255). 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

Browse thousands of different options on Cheapflights for your next trip

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Top 3 airlines flying from Seattle to Toronto

Discover the top 3 airlines that operate flights from Seattle to Toronto. 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 629,999 searches. Data last updated 12 June 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 189AverageC$ 701FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
WestJetCheapestC$ 294AverageC$ 490FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Alaska AirlinesCheapestC$ 388AverageC$ 681FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines 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 Toronto?

Deals for Seattle to Toronto flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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

Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Toronto for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

Need flexible booking options for your flight to Toronto from Seattle? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Toronto from Seattle today and book when prices fit your budget.

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