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Cheap flights from Montreal to Seattle from C$ 275

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 12/9. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — SEA
17 Aug — 24 Aug1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Montreal to Seattle/Tacoma Intl are usually found in September or July, booked 20 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

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 18 July 2026.

Tue 20/106:00 p.m.
YUL
-
SEA
1 stop7h 42m
Air Canada
Wed 21/105:40 a.m.
SEA
-
YUL
1 stop8h 14m
Air Canada
Deal found 17/7C$ 534
Sun 6/95:30 p.m.
YUL
-
SEA
1 stop28h 15m
WestJet
Thu 17/97:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Deal found 16/7C$ 536
Sun 16/88:00 p.m.
YUL
-
SEA
1 stop16h 40m
WestJet
Tue 25/810:30 a.m.
SEA
-
YUL
2 stops10h 55m
WestJet
Deal found 13/7C$ 539
Sat 7/112:29 p.m.
YUL
-
SEA
2 stops13h 29m
American Airlines
Tue 10/115:54 p.m.
SEA
-
YUL
2 stops15h 21m
American Airlines
Deal found 14/7C$ 540
Sat 29/89:15 a.m.
YUL
-
SEA
1 stop9h 51m
United Airlines
Tue 1/95:13 p.m.
SEA
-
YUL
1 stop14h 27m
United Airlines
Deal found 17/7C$ 541
Thu 13/89:20 a.m.
YUL
-
SEA
2 stops12h 12m
Air Canada
Tue 18/83:00 p.m.
SEA
-
YUL
2 stops13h 10m
Air Canada
Deal found 13/7C$ 543
Wed 5/86:45 a.m.
YUL
-
SEA
2 stops29h 55m
WestJet
Mon 10/810:30 a.m.
SEA
-
YUL
2 stops10h 55m
WestJet
Deal found 15/7C$ 544
Fri 7/88:00 p.m.
YUL
-
SEA
1 stop16h 40m
WestJet
Mon 17/87:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Deal found 15/7C$ 546
Tue 20/106:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Wed 21/107:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Deal found 16/7C$ 547
Wed 29/79:45 a.m.
YUL
-
SEA
1 stop12h 21m
United Airlines
Tue 11/86:30 a.m.
SEA
-
YUL
2 stops22h 46m
United Airlines
Deal found 14/7C$ 548
Thu 6/85:30 p.m.
YUL
-
SEA
1 stop19h 10m
WestJet
Tue 11/810:30 a.m.
SEA
-
YUL
1 stop17h 35m
WestJet
Deal found 13/7C$ 550

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 18 July 2026.

Round-trip from

C$ 534

One-way from

C$ 275

Popular in

April

Cheapest in

September

Average price

C$ 597
Air Canada
  • Air Canada
  • 20/10-21/10
  • 2 total stops
  • 15h 56m total
  • Montreal to Seattle
Search Deals
American Airlines
  • American Airlines
  • 12/9
  • 1 total stop
  • 18h 07m total
  • Montreal to Seattle
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (C$ 163 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease (C$ 76 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
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 18 July 2026.
Use the filters below to find and compare flights from Montreal to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sat 31/10

2:13 p.m.-8:38 p.m.

1 stop9h 25m

Seattle/Tacoma Intl

Sat 31/10

11:03 p.m.-1:51 p.m.

1 stop12h 48m

C$ 534

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sat 29/8

9:45 a.m.-7:07 p.m.

1 stop12h 22m

Seattle/Tacoma Intl

Tue 1/9

5:20 p.m.-10:40 a.m.

2 stops14h 20m

C$ 541

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sat 5/12

2:20 p.m.-8:10 p.m.

1 stop8h 50m

Seattle/Tacoma Intl

Tue 5/1

5:07 a.m.-9:40 p.m.

2 stops13h 33m

C$ 543

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Fri 28/8

4:55 p.m.-10:43 p.m.

1 stop8h 48m

Seattle/Tacoma Intl

Tue 1/9

5:20 p.m.-10:40 a.m.

2 stops14h 20m

C$ 551

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Tue 20/10

9:45 a.m.-8:37 p.m.

2 stops13h 52m

Seattle/Tacoma Intl

Wed 21/10

8:10 a.m.-7:45 p.m.

1 stop8h 35m

C$ 553

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Thu 30/7

7:00 a.m.-4:49 p.m.

1 stop12h 49m

Seattle/Tacoma Intl

Tue 4/8

9:53 a.m.-11:30 p.m.

1 stop10h 37m

C$ 596

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Tue 4/8

12:47 p.m.-10:05 p.m.

1 stop12h 18m

Seattle/Tacoma Intl

Sat 8/8

8:59 a.m.-11:40 p.m.

1 stop11h 41m

C$ 614

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Tue 25/8

12:47 p.m.-10:05 p.m.

1 stop12h 18m

Seattle/Tacoma Intl

Mon 7/9

8:59 a.m.-11:40 p.m.

1 stop11h 41m

C$ 648

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sat 15/8

8:10 a.m.-8:43 p.m.

1 stop15h 33m

Seattle/Tacoma Intl

Tue 18/8

4:45 p.m.-6:48 a.m.

1 stop11h 03m

C$ 652
Cheapest one-way

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Tue 8/9

6:00 a.m.-2:49 p.m.

1 stop11h 49m

C$ 276

Flights are sorted by cheapest round-trip flights first.

Deals found on 18/7

Showing 1-10 of 18 resultsSorted by cheapest first
1
2

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

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

Currently, March is the cheapest month in which you can book a flight from Montreal to Seattle (average of C$ 641). Flying from Montreal to Seattle in June is currently the most expensive (average of C$ 847). 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 41% 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$ 501.

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 19m.

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 Chicago (ORD) offer the fastest connection on this route, with an average layover time of 1h 06m.

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

Booking 45 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.

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 18 July 2026.
Read through reviews of airlines operating flights from Montreal to Seattle, such as Delta,United Airlines, andWestJet. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.8
Good
8,476 reviews
Check prices

Overall

7.8

Crew

8.5

Comfort

7.8

Food

7.2

Boarding

8.1

Entertainment

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
Delta
7.8
Good
8,476 reviews
Delta
7.8
Good
8,476 reviews
Check prices

Overall

7.8

Crew

8.5

Comfort

7.8

Food

7.2

Boarding

8.1

Entertainment

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
United Airlines
7.4
Good
10,006 reviews
Delta
7.8
Good
8,476 reviews
Check prices

Overall

7.8

Crew

8.5

Comfort

7.8

Food

7.2

Boarding

8.1

Entertainment

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
WestJet
7.2
Good
3,409 reviews
Delta
7.8
Good
8,476 reviews
Check prices

Overall

7.8

Crew

8.5

Comfort

7.8

Food

7.2

Boarding

8.1

Entertainment

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
Air Canada
7.1
Good
11,352 reviews
Delta
7.8
Good
8,476 reviews
Check prices

Overall

7.8

Crew

8.5

Comfort

7.8

Food

7.2

Boarding

8.1

Entertainment

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,

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 9h 25m. The distance from Montreal to Seattle is about 3663 km.

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

    Delta, at C$ 285, was found to be the cheapest airline from Montreal to Seattle.Alternate airlines to your destination round-trip include WestJet and American Airlines. Delta is 63% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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, March is the cheapest month in which you can book a flight from Montreal to Seattle (average of C$ 641). Flying from Montreal to Seattle in June is currently the most expensive (average of C$ 847). 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
SeaTac
Kent
Leavenworth
Mukilteo
Tacoma
Renton
Cashmere
Lynnwood
Tukwila
Olympia
Marysville
Federal Way
Kirkland
Ellensburg

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 18 July 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 285AverageC$ 711FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
WestJetCheapestC$ 415AverageC$ 532FlexibilityNo cancel feeOn-time60%
Search WestJet flights
American AirlinesCheapestC$ 426AverageC$ 633FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapestC$ 504AverageC$ 874FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 544AverageC$ 729FlexibilityNo cancel feeOn-time67%
Search Air Canada 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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