$228 Cheap Flights from Montreal (YUL) to Seattle (SEA)

View $228 flight on Sun, Oct 19, 2025Opens in a new window

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

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Cheap Flights from Montreal to Seattle (YUL-SEA)

Prices were available within the past 7 days and start at $228 for one-way flights and $400 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

WestJet
Tue, Oct 14 - Fri, Oct 24
YUL
Montreal
SEA
Seattle
$400 Roundtrip, just found
$400
Roundtrip
just found
Select WestJet flight, departing Tue, Oct 14 from Montreal to Seattle, returning Fri, Oct 24, priced at $400 just found
Air Canada
Thu, Sep 11 - Sun, Sep 14
YUL
Montreal
SEA
Seattle
$409 Roundtrip, found 2 days ago
$409
Roundtrip
found 2 days ago
Select Air Canada flight, departing Thu, Sep 11 from Montreal to Seattle, returning Sun, Sep 14, priced at $409 found 2 days ago
WestJet
Tue, Aug 26 - Tue, Sep 16
YUL
Montreal
SEA
Seattle
$409 Roundtrip, found 4 days ago
$409
Roundtrip
found 4 days ago
Select WestJet flight, departing Tue, Aug 26 from Montreal to Seattle, returning Tue, Sep 16, priced at $409 found 4 days ago
Air Canada
Fri, Oct 3 - Tue, Oct 7
YUL
Montreal
SEA
Seattle
$410 Roundtrip, found 22 hours ago
$410
Roundtrip
found 22 hours ago
Select Air Canada flight, departing Fri, Oct 3 from Montreal to Seattle, returning Tue, Oct 7, priced at $410 found 22 hours ago
WestJet
Wed, Aug 27 - Sun, Sep 7
YUL
Montreal
SEA
Seattle
$413 Roundtrip, found 5 days ago
$413
Roundtrip
found 5 days ago
Select WestJet flight, departing Wed, Aug 27 from Montreal to Seattle, returning Sun, Sep 7, priced at $413 found 5 days ago
Air Canada
Thu, Sep 11 - Thu, Sep 18
YUL
Montreal
SEA
Seattle
$414 Roundtrip, found 2 days ago
$414
Roundtrip
found 2 days ago
Select Air Canada flight, departing Thu, Sep 11 from Montreal to Seattle, returning Thu, Sep 18, priced at $414 found 2 days ago
Air Canada
Thu, Sep 18 - Tue, Sep 23
YUL
Montreal
SEA
Seattle
$419 Roundtrip, found 2 days ago
$419
Roundtrip
found 2 days ago
Select Air Canada flight, departing Thu, Sep 18 from Montreal to Seattle, returning Tue, Sep 23, priced at $419 found 2 days ago
United
Wed, Sep 3 - Sun, Sep 14
YUL
Montreal
SEA
Seattle
$424 Roundtrip, found 2 days ago
$424
Roundtrip
found 2 days ago
Select United flight, departing Wed, Sep 3 from Montreal to Seattle, returning Sun, Sep 14, priced at $424 found 2 days ago
American Airlines
Wed, Sep 3 - Wed, Sep 10
YUL
Montreal
SEA
Seattle
$434 Roundtrip, found 2 days ago
$434
Roundtrip
found 2 days ago
Select American Airlines flight, departing Wed, Sep 3 from Montreal to Seattle, returning Wed, Sep 10, priced at $434 found 2 days ago
Delta
Wed, Sep 3 - Wed, Sep 10
YUL
Montreal
SEA
Seattle
$434 Roundtrip, found 2 days ago
$434
Roundtrip
found 2 days ago
Select Delta flight, departing Wed, Sep 3 from Montreal to Seattle, returning Wed, Sep 10, priced at $434 found 2 days ago

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

May is typically the cheapest month to fly

From $279 - $588 per traveler.

Graph displaying average flight prices per month

Flights from Montreal (YUL) to Seattle (SEA)
Origin airport
Pierre Elliott Trudeau Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Air Canada, American Airlines, Delta, United, WestJet
Roundtrip price
$400
Distance
2277 mi
Average flight time
5 hours 56 mins

Montreal to Seattle Flights

The cheapest times to fly from Montreal to Seattle

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 Montreal to Seattle are during the month of October. You can find some of the cheapest flights from Montreal to Seattle with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Montreal to Seattle

Sunday is one of the best days to book for cheap flights from Montreal to Seattle: 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 Montreal to Seattle

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 Montreal to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $228 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 Montreal to Seattle 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 Montreal to Seattle 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 Pierre Elliott Trudeau Intl. Airport (YUL) to Seattle - Tacoma Intl. Airport (SEA) cost?
Cheap round-trip flights from Pierre Elliott Trudeau Intl. Airport (YUL) to Seattle - Tacoma Intl. Airport (SEA) start from $451. 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 United flight leaving YUL on July 23 2025 and touching down at SEA. The price was last updated on July 3 2025 and has not changed since.
What is the cheapest month to fly from YUL to SEA?
The cheapest flights from YUL to SEA 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 YUL to SEA?
Right now, the cheapest airline operating one-way flights from YUL to SEA is Air Canada. You can take off on this route from $232. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from YUL on September 6 2025. Prices were last updated on July 3 2025 and have not changed since.
How many flights per day from Pierre Elliott Trudeau Intl. Airport (YUL) to Seattle - Tacoma Intl. Airport (SEA)?
Direct flights from Pierre Elliott Trudeau Intl. Airport (YUL) to Seattle - Tacoma Intl. Airport (SEA) aren't available daily, so you'll need 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 YUL to SEA?
Typically you'll find the widest variety of flight choices on a Friday. Tuesdays are often the quietest.* But this can change depending on the airline, season and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Pierre Elliott Trudeau Intl. Airport (YUL) to Seattle - Tacoma Intl. Airport (SEA)?
To land at Seattle - Tacoma Intl. Airport (SEA) on time, choose a flight that takes off from Pierre Elliott Trudeau Intl. Airport (YUL) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**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 Pierre Elliott Trudeau Intl. Airport (YUL) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Last-minute bookings from YUL to SEA are usually more expensive. For the lowest rates, start searching for flights as soon as possible. That said, if you can play around with your travel dates, you may find a cheap fare right before your trip.
Is it cheaper to book a YUL to SEA flight and hotel package?
Compared with arranging flights and hotels separately, booking a YUL to SEA flight and hotel package with Expedia could lead to significant savings. Better yet, having everything in one place takes the hassle out of planning your trip. Simply pick your flights and choose from our extensive range of stays, then tailor your trip with extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from Pierre Elliott Trudeau Intl. Airport (YUL) to Seattle - Tacoma Intl. Airport (SEA)?
In most cases, you can cancel or modify your YUL to SEA flight. However, there may be additional fees, especially if you made your booking over 24 hours ago. Check your itinerary for the airline's fees and policies on flight changes, or if you'd like more details, visit our Customer Service portal.

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*Available to One Key members.