$156 Cheap Flights from Seattle (SEA) to Montreal (YUL)

View $156 flight on Thu, Sep 25, 2025Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Montreal–Trudeau Intl. Airport (YUL)

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Cheap Flights from Seattle to Montreal (SEA-YUL)

Prices were available within the past 7 days and start at $156 for one-way flights and $287 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Sun, Sep 14 - Mon, Sep 15
SEA
Seattle
YUL
Montreal
$287 Roundtrip, found 23 hours ago
$287
Roundtrip
found 23 hours ago
Select Air Canada flight, departing Sun, Sep 14 from Seattle to Montreal, returning Mon, Sep 15, priced at $287 found 23 hours ago
Air Canada
Wed, Sep 24 - Thu, Sep 25
SEA
Seattle
YUL
Montreal
$291 Roundtrip, found 1 day ago
$291
Roundtrip
found 1 day ago
Select Air Canada flight, departing Wed, Sep 24 from Seattle to Montreal, returning Thu, Sep 25, priced at $291 found 1 day ago
Air Canada
Wed, Oct 29 - Thu, Oct 30
SEA
Seattle
YUL
Montreal
$315 Roundtrip, found 2 days ago
$315
Roundtrip
found 2 days ago
Select Air Canada flight, departing Wed, Oct 29 from Seattle to Montreal, returning Thu, Oct 30, priced at $315 found 2 days ago
Air Canada
Mon, Aug 25 - Tue, Aug 26
SEA
Seattle
YUL
Montreal
$338 Roundtrip, just found
$338
Roundtrip
just found
Select Air Canada flight, departing Mon, Aug 25 from Seattle to Montreal, returning Tue, Aug 26, priced at $338 just found
Air Canada
Thu, Sep 25 - Tue, Sep 30
SEA
Seattle
YUL
Montreal
$339 Roundtrip, just found
$339
Roundtrip
just found
Select Air Canada flight, departing Thu, Sep 25 from Seattle to Montreal, returning Tue, Sep 30, priced at $339 just found
Air Canada
Fri, Oct 10 - Fri, Oct 17
SEA
Seattle
YUL
Montreal
$339 Roundtrip, found 21 hours ago
$339
Roundtrip
found 21 hours ago
Select Air Canada flight, departing Fri, Oct 10 from Seattle to Montreal, returning Fri, Oct 17, priced at $339 found 21 hours ago
United
Mon, Sep 15 - Tue, Sep 16
SEA
Seattle
YUL
Montreal
$340 Roundtrip, found 2 hours ago
$340
Roundtrip
found 2 hours ago
Select United flight, departing Mon, Sep 15 from Seattle to Montreal, returning Tue, Sep 16, priced at $340 found 2 hours ago
WestJet
Fri, Oct 10 - Fri, Oct 17
SEA
Seattle
YUL
Montreal
$354 Roundtrip, found 21 hours ago
$354
Roundtrip
found 21 hours ago
Select WestJet flight, departing Fri, Oct 10 from Seattle to Montreal, returning Fri, Oct 17, priced at $354 found 21 hours ago
American Airlines
Thu, Oct 16 - Sun, Oct 19
SEA
Seattle
YUL
Montreal
$358 Roundtrip, found 4 days ago
$358
Roundtrip
found 4 days ago
Select American Airlines flight, departing Thu, Oct 16 from Seattle to Montreal, returning Sun, Oct 19, priced at $358 found 4 days ago
Delta
Sun, Nov 2 - Wed, Nov 5
SEA
Seattle
YUL
Montreal
$389 Roundtrip, just found
$389
Roundtrip
just found
Select Delta flight, departing Sun, Nov 2 from Seattle to Montreal, returning Wed, Nov 5, priced at $389 just found

Find the cheapest month to fly from Seattle (SEA) to Montreal (YUL)

June is typically the cheapest month to fly

From $329 - $572 per traveler.

Graph displaying average flight prices per month

Flights from Seattle (SEA) to Montreal (YUL)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Pierre Elliott Trudeau Intl.
Airlines serving
Air Canada, American Airlines, Delta, United, WestJet
Roundtrip price
$286
Distance
2277 mi
Average flight time
5 hours 9 mins

Seattle to Montreal Flights

The cheapest times to fly from Seattle to Montreal

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seattle to Montreal are during the month of September. You can find some of the cheapest flights from Seattle to Montreal with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to Montreal

Sunday is one of the best days to book for cheap flights from Seattle to Montreal: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Seattle to Montreal

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seattle to Montreal in 2025. You can also book with separate airlines for your outbound and return journeys, from $156 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seattle to Montreal flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seattle to Montreal airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Pierre Elliott Trudeau Intl. Airport (YUL) cost?
Find cheap return fares from Seattle - Tacoma Intl. Airport (SEA) to Pierre Elliott Trudeau Intl. Airport (YUL) starting at $384. Grab your seat and be on your way. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Air Canada flight leaving SEA on August 8 2025 and touching down at YUL. The price was last updated on July 13 2025 and has not changed since.
What is the cheapest month to fly from SEA to YUL?
The cheapest flights from SEA to YUL are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from SEA to YUL?
With prices starting from $165 for a one-way journey from SEA to YUL, Air Canada is currently the cheapest carrier on this route. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from SEA on October 8 2025. Prices were last updated on July 13 2025 and have not changed since.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Pierre Elliott Trudeau Intl. Airport (YUL)?
Nonstop flights from Seattle - Tacoma Intl. Airport (SEA) to Pierre Elliott Trudeau Intl. Airport (YUL) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your dates and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SEA to YUL?
Friday is generally the busiest day for flights, while Tuesday tends to be the quietest.* Just remember that flight schedules can vary depending on a number of factors, including the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to Pierre Elliott Trudeau Intl. Airport (YUL)?
Opt for a flight from Seattle - Tacoma Intl. Airport (SEA) to Pierre Elliott Trudeau Intl. Airport (YUL) that leaves before 3 PM to reduce the likelihood of delays. Departures later than this have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Seattle - Tacoma Intl. Airport (SEA) to Pierre Elliott Trudeau Intl. Airport (YUL) last-minute?
Waiting until just before your departure to book your flight from SEA to YUL generally means paying more. While you may come across some last-minute discounts, there's no guarantee. Keep your travel plans flexible to maximize your chances of scoring a bargain.
Is it cheaper to book a SEA to YUL flight and hotel package?
Booking a SEA to YUL flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of hotels and then add flights, car rentals and activities to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Pierre Elliott Trudeau Intl. Airport (YUL)?
Typically, you can cancel or reschedule your SEA to YUL flight. However, there may be additional fees, especially if you made your booking more than 24 hours ago. Check your itinerary for the airline's fees and guidelines on flight changes, or if you want more information, head to our Customer Service portal.

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*Available to One Key members.