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Cheap flights from Montreal to Seattle from C$ 229

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 2/5. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — SEA
5 Mar — 12 Mar1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Montreal to Seattle/Tacoma Intl are usually found in February or August, booked 34 days in advance, depart on a Friday or Wednesday and return on a Friday

Cheap flight deals from Montreal to Seattle

Enter your travel dates to find the best prices.

Cheapest flights from Montreal to Seattle
Explore the most affordable flight options available from Montreal to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 February 2026.

Wed 13/55:30 p.m.
YUL
-
SEA
1 stop28h 15m
WestJet
Sat 23/57:35 p.m.
SEA
-
YUL
1 stop8h 25m
WestJet
Deal found 1/2C$ 356
Mon 16/37:30 p.m.
YUL
-
SEA
1 stop21h 49m
WestJet
Mon 23/33:10 p.m.
SEA
-
YUL
1 stop12h 55m
WestJet
Deal found 1/2C$ 399
Mon 9/37:30 p.m.
YUL
-
SEA
1 stop21h 49m
WestJet
Mon 16/33:10 p.m.
SEA
-
YUL
1 stop12h 55m
WestJet
Deal found 3/2C$ 400
Tue 10/34:15 p.m.
YUL
-
SEA
1 stop25h 04m
WestJet
Mon 16/33:10 p.m.
SEA
-
YUL
1 stop12h 55m
WestJet
Deal found 1/2C$ 404
Mon 16/37:30 p.m.
YUL
-
SEA
1 stop21h 49m
WestJet
Tue 24/33:10 p.m.
SEA
-
YUL
1 stop12h 55m
WestJet
Deal found 2/2C$ 406

Find flight deals from Montreal to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Montreal (YMQ) to Seattle (SEA). 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 3 February 2026.

Round-trip from

C$ 356

One-way from

C$ 229

Popular in

January

Cheapest in

February

Average price

C$ 645

Good round-trip deal

C$ 625 or less
WestJet
  • WestJet
  • 13/5-23/5
  • 2 total stops
  • 36h 40m total
  • Montreal to Seattle
Search Deals
WestJet
  • WestJet
  • 2/5
  • 1 total stop
  • 16h 40m total
  • Montreal to Seattle
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (C$ 84 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals
Price to beat on a round-trip flight from Montreal (YMQ) to Seattle/Tacoma Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Montreal to Seattle 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 3 February 2026.
Use the filters below to find and compare flights from Montreal to Seattle that are best for you.

Fly from

Montreal

Fly to

Seattle

Route

Depart

Return

Price

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 16/3

7:30 p.m.-2:19 p.m.

1 stop21h 49m

Seattle/Tacoma Intl

Mon 23/3

3:10 p.m.-7:05 a.m.

1 stop12h 55m

C$ 399

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 9/3

7:30 p.m.-2:19 p.m.

1 stop21h 49m

Seattle/Tacoma Intl

Mon 16/3

3:10 p.m.-7:05 a.m.

1 stop12h 55m

C$ 400

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Wed 13/5

7:25 p.m.-6:45 p.m.

2 stops26h 20m

Seattle/Tacoma Intl

Sat 23/5

10:30 a.m.-6:25 p.m.

2 stops28h 55m

C$ 418

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Tue 10/3

6:45 a.m.-2:19 p.m.

2 stops34h 34m

Seattle/Tacoma Intl

Mon 16/3

3:10 p.m.-12:38 a.m.

2 stops30h 28m

C$ 421

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 18/5

7:25 p.m.-6:45 p.m.

2 stops26h 20m

Seattle/Tacoma Intl

Sat 23/5

10:30 a.m.-12:40 a.m.

2 stops35h 10m

C$ 486

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 25/5

7:25 p.m.-9:40 a.m.

2 stops17h 15m

Seattle/Tacoma Intl

Fri 29/5

7:35 p.m.-7:00 a.m.

1 stop8h 25m

C$ 554

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 9/3

6:45 a.m.-10:57 p.m.

3 stops19h 12m

Seattle/Tacoma Intl

Mon 16/3

3:10 p.m.-7:05 a.m.

1 stop12h 55m

C$ 576

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 20/4

6:35 p.m.-9:46 a.m.

2 stops18h 11m

Seattle/Tacoma Intl

Fri 24/4

11:05 p.m.-1:09 p.m.

1 stop11h 04m

C$ 594

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Tue 17/3

7:00 a.m.-7:25 p.m.

2 stops15h 25m

Seattle/Tacoma Intl

Mon 23/3

11:59 p.m.-7:48 p.m.

2 stops16h 49m

C$ 594

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Wed 25/2

3:00 p.m.-11:51 p.m.

1 stop11h 51m

Seattle/Tacoma Intl

Fri 27/2

11:59 p.m.-2:00 p.m.

1 stop11h 01m

C$ 594

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/2

Showing 1-10 of 18 results
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Best time to book a flight from Montreal to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Montreal 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 Montreal to Seattle

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

Use this chart to determine the optimal time to book a round-trip flight from Montreal to Seattle. Price data was last updated on 30 January 2026.

Booking 29 days in advance of your planned departure date is, on average, the best time to get cheap flights from Montreal to Seattle. 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 Montreal to Seattle?

Currently, April is the cheapest month in which you can book a flight from Montreal to Seattle (average of C$ 270). Flying from Montreal to Seattle in January is currently the most expensive (average of C$ 500). 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.

How much does it cost to fly round-trip from Montreal to Seattle?

What’s the top layover airport for flights from Montreal to Seattle?

Share of one-stop round-trip flights from Montreal to Seattle chosen by Cheapflights users in the past 12 months, using the same layover each way.

Calgary (YYC) – chosen by Cheapflights users on 53% of one-stop itineraries from Montreal to Seattle on Cheapflights.

What’s the cheapest layover airport for flights from Montreal to Seattle?

Average round-trip fare for 1-stop flights from Montreal to Seattle, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Calgary (YYC) is the most affordable 1-stop option, with an average round-trip price of C$ 522.

What’s the fastest layover option from Montreal to Seattle?

Shortest average travel time for 1-stop one-way flights from Montreal to Seattle, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Vancouver (YVR) have the shortest average one-way travel time for 1-stop routes: 8h 12m.

Which airport typically offers the quickest layover for flights from Montreal to Seattle?

Average layover duration for 1-stop one-way flights from Montreal to Seattle, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Vancouver (YVR) offer the fastest connection on this route, with an average layover time of 1h 43m.

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated 3 February 2026.
Read through reviews of airlines operating flights from Montreal to Seattle, such as United Airlines,WestJet, andAir Canada. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,236 reviews
Check prices

Comfort

7.3

Overall

7.4

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
United Airlines
7.4
Good
9,236 reviews
United Airlines
7.4
Good
9,236 reviews
Check prices

Comfort

7.3

Overall

7.4

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
WestJet
7.2
Good
3,255 reviews
United Airlines
7.4
Good
9,236 reviews
Check prices

Comfort

7.3

Overall

7.4

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
Air Canada
7.1
Good
10,684 reviews
United Airlines
7.4
Good
9,236 reviews
Check prices

Comfort

7.3

Overall

7.4

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats

Related info for your journey

Find useful and relevant information for your journey from Montreal to Seattle. 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 into for flights to Seattle from Montreal?

    Located just 18.4 km from the city centre, Seattle/Tacoma Intl is the airport most travellers will use when flying to Seattle from Montreal. Booking flights from Montreal to Seattle/Tacoma Intl (SEA) should be relatively easy as there are 0 daily inbound flights from Montreal from 5 different airlines.

  • How long is the flight from Montreal to Seattle?

    Departing from Montreal to Seattle will take you 21h 49m. The distance from Montreal to Seattle is about 3663 km.

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

    American Airlines, at C$ 255, was found to be the cheapest airline from Montreal to Seattle.Alternate airlines to your destination round-trip include Delta and WestJet. American Airlines is 64% cheaper than the average price of flights available within the next 90 days to this destination.

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

    The cheapest airlines for a one-way flight from Montreal to Seattle are WestJet (C$ 213), Air Canada (C$ 259), and United Airlines (C$ 283).

  • What are the cheapest flights from Montreal to Seattle?

    While on average a flight from Montreal to Seattle is generally C$ 696, our data shows the cheapest flight currently is C$ 625. When looking at the most popular route, (Montreal Pierre Elliott Trudeau Intl - Seattle/Tacoma Intl), you can expect to pay C$ 483 for that flight.

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

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

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

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

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

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

    Currently, April is the cheapest month in which you can book a flight from Montreal to Seattle (average of C$ 270). Flying from Montreal to Seattle in January is currently the most expensive (average of C$ 500). 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

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
SeaTac
Mukilteo
Tacoma
Kent
Bothell
Cashmere
Tukwila
Olympia
Renton
Marysville
Lynnwood
Kirkland

Browse thousands of different options on Cheapflights for your next trip

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Top 5 airlines flying from Montreal to Seattle

Discover the top 5 airlines that operate flights from Montreal to Seattle. 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 3 February 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapestC$ 255AverageC$ 463FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
DeltaCheapestC$ 278AverageC$ 610FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
WestJetCheapestC$ 353AverageC$ 518FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 491AverageC$ 677FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 511AverageC$ 703FlexibilityNo cancel feeOn-time69%
Search United 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 Montreal to Seattle?

Cheapflights helps you search for flights from Montreal to Seattle via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

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 Montreal to Seattle.

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

Need flexible booking options for your flight to Seattle from Montreal? 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 Montreal to Seattle 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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