$123 Cheap Flights from Seattle (SEA) to Montreal (YUL)

View $123 flight on Fri, Oct 17, 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 $123 for one-way flights and $295 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Tue, Oct 7 - Wed, Oct 8
SEA
Seattle
YUL
Montreal
$295 Roundtrip, found 22 hours ago
$295
Roundtrip
found 22 hours ago
Select Air Canada flight, departing Tue, Oct 7 from Seattle to Montreal, returning Wed, Oct 8, priced at $295 found 22 hours ago
WestJet
Fri, Oct 17 - Thu, Oct 23
SEA
Seattle
YUL
Montreal
$299 Roundtrip, just found
$299
Roundtrip
just found
Select WestJet flight, departing Fri, Oct 17 from Seattle to Montreal, returning Thu, Oct 23, priced at $299 just found
United
Tue, Oct 21 - Wed, Oct 22
SEA
Seattle
YUL
Montreal
$305 Roundtrip, found 2 days ago
$305
Roundtrip
found 2 days ago
Select United flight, departing Tue, Oct 21 from Seattle to Montreal, returning Wed, Oct 22, priced at $305 found 2 days ago
WestJet
Wed, Oct 8 - Mon, Oct 20
SEA
Seattle
YUL
Montreal
$311 Roundtrip, found 1 day ago
$311
Roundtrip
found 1 day ago
Select WestJet flight, departing Wed, Oct 8 from Seattle to Montreal, returning Mon, Oct 20, priced at $311 found 1 day ago
WestJet
Thu, Oct 23 - Tue, Oct 28
SEA
Seattle
YUL
Montreal
$312 Roundtrip, found 16 hours ago
$312
Roundtrip
found 16 hours ago
Select WestJet flight, departing Thu, Oct 23 from Seattle to Montreal, returning Tue, Oct 28, priced at $312 found 16 hours ago
WestJet
Wed, Oct 1 - Wed, Oct 15
SEA
Seattle
YUL
Montreal
$313 Roundtrip, found 1 day ago
$313
Roundtrip
found 1 day ago
Select WestJet flight, departing Wed, Oct 1 from Seattle to Montreal, returning Wed, Oct 15, priced at $313 found 1 day ago
Air Canada
Tue, Oct 7 - Wed, Oct 8
SEA
Seattle
YUL
Montreal
$314 Roundtrip, found 22 hours ago
$314
Roundtrip
found 22 hours ago
Select Air Canada flight, departing Tue, Oct 7 from Seattle to Montreal, returning Wed, Oct 8, priced at $314 found 22 hours ago
WestJet
Sun, Oct 12 - Wed, Oct 15
SEA
Seattle
YUL
Montreal
$318 Roundtrip, found 12 hours ago
$318
Roundtrip
found 12 hours ago
Select WestJet flight, departing Sun, Oct 12 from Seattle to Montreal, returning Wed, Oct 15, priced at $318 found 12 hours ago
American Airlines
Thu, Sep 25 - Tue, Oct 7
SEA
Seattle
YUL
Montreal
$324 Roundtrip, found 1 day ago
$324
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Sep 25 from Seattle to Montreal, returning Tue, Oct 7, priced at $324 found 1 day ago
Delta
Wed, Dec 31 - Thu, Jan 1
SEA
Seattle
YUL
Montreal
$338 Roundtrip, found 2 days ago
$338
Roundtrip
found 2 days ago
Select Delta flight, departing Wed, Dec 31 from Seattle to Montreal, returning Thu, Jan 1, priced at $338 found 2 days ago

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

October is typically the cheapest month to fly

From $299 - $615 per traveler.

Alternative airports near Montreal

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Pierre Elliott Trudeau Intl. YUL. Cheapest and Closest option available. Average driving time to city center is 17 minutes. Flights from $452
YUL
Pierre Elliott Trudeau Intl.
CheapestClosest
Average driving time to city center17 min
Flights from $452
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
$295
Distance
2277 mi
Average flight time
5 hours 13 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 October. 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 $123 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?
Secure a cheap one-way flight from $123 or cheap return flight from $295 from Seattle - Tacoma Intl. Airport (SEA) to Pierre Elliott Trudeau Intl. Airport (YUL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to Pierre Elliott Trudeau Intl. Airport (YUL)?
October is the least expensive month to fly from SEA to YUL. Traveling during quieter months is often the key to scoring lower fares.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Pierre Elliott Trudeau Intl. Airport (YUL)?
Expedia's filter tool lets you easily compare different airlines, travel time and fares all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to find the carrier with the cheapest SEA to YUL flight.
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.