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Cheap flights from Montreal to Seattle from C$ 228

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 29/7. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — SEA
18 Jun — 25 Jun1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Montreal to Seattle/Tacoma Intl are usually found in March or February, booked 68 days in advance, depart on a Wednesday or Friday 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 19 May 2026.

Thu 16/76:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Sun 19/77:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Deal found 14/5C$ 371
Thu 20/86:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Fri 28/87:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Deal found 16/5C$ 375
Thu 9/76:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Mon 13/77:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Deal found 15/5C$ 377
Wed 8/76:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Mon 20/710:30 a.m.
SEA
-
YUL
2 stops10h 55m
WestJet
Deal found 18/5C$ 379
Wed 8/76:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Wed 15/710:30 a.m.
SEA
-
YUL
2 stops10h 55m
WestJet
Deal found 18/5C$ 382
Thu 3/96:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Sat 12/97:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Deal found 14/5C$ 394
Wed 5/85:30 p.m.
YUL
-
SEA
1 stop28h 15m
WestJet
Mon 10/87:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Deal found 18/5C$ 401
Thu 23/75:45 p.m.
YUL
-
SEA
2 stops28h 00m
WestJet
Sun 26/77:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Deal found 14/5C$ 407

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 19 May 2026.

Round-trip from

C$ 371

One-way from

C$ 228

Popular in

April

Cheapest in

March

Average price

C$ 671
WestJet
  • WestJet
  • 16/7-19/7
  • 3 total stops
  • 23h 30m total
  • Montreal to Seattle
Search Deals
WestJet
  • WestJet
  • 29/7
  • 2 total stops
  • 15h 00m total
  • Montreal to Seattle
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (C$ 135 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease (C$ 72 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 19 May 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

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Wed 12/8

8:00 p.m.-6:45 p.m.

1 stop25h 45m

Seattle/Tacoma Intl

Mon 24/8

7:35 p.m.-7:05 a.m.

1 stop8h 30m

C$ 411

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Thu 16/7

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

2 stops15h 00m

Seattle/Tacoma Intl

Sun 19/7

7:35 p.m.-12:25 a.m.

2 stops25h 50m

C$ 414
Quickest round-trip

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Wed 3/6

9:45 a.m.-4:09 p.m.

1 stop9h 24m

Seattle/Tacoma Intl

Wed 10/6

1:00 p.m.-12:13 a.m.

1 stop8h 13m

C$ 693

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Thu 4/6

3:25 p.m.-11:44 p.m.

1 stop11h 19m

Seattle/Tacoma Intl

Wed 10/6

1:00 p.m.-12:13 a.m.

1 stop8h 13m

C$ 693

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Wed 3/6

9:45 a.m.-4:09 p.m.

1 stop9h 24m

Seattle/Tacoma Intl

Mon 8/6

11:00 p.m.-4:10 p.m.

1 stop14h 10m

C$ 693

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sat 13/6

5:45 p.m.-6:45 p.m.

2 stops28h 00m

Seattle/Tacoma Intl

Sat 20/6

7:00 a.m.-12:25 a.m.

2 stops14h 25m

C$ 775

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 15/6

7:00 a.m.-10:08 p.m.

1 stop18h 08m

Seattle/Tacoma Intl

Fri 19/6

8:05 p.m.-5:10 p.m.

1 stop18h 05m

C$ 783

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 8/6

4:30 p.m.-8:00 a.m.

1 stop18h 30m

Seattle/Tacoma Intl

Thu 11/6

7:54 p.m.-4:10 p.m.

2 stops17h 16m

C$ 785

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sun 24/5

9:15 a.m.-4:00 p.m.

1 stop9h 45m

Seattle/Tacoma Intl

Sun 31/5

11:20 p.m.-7:45 p.m.

1 stop17h 25m

C$ 793

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Thu 28/5

9:45 a.m.-11:32 p.m.

2 stops16h 47m

Seattle/Tacoma Intl

Thu 4/6

8:00 a.m.-7:45 p.m.

1 stop8h 45m

C$ 793

Flights are sorted by cheapest round-trip flights first.

Deals found on 14/5

Showing 1-10 of 20 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

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

Booking 76 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, June is the cheapest month in which you can book a flight from Montreal to Seattle (average of C$ 228). Flying from Montreal to Seattle in February is currently the most expensive (average of C$ 443). 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 47% 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$ 481.

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 26m.

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 16m.

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 19 May 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
9,732 reviews
Check prices

Boarding

7.7

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Crew

8.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
United Airlines
7.4
Good
9,732 reviews
United Airlines
7.4
Good
9,732 reviews
Check prices

Boarding

7.7

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Crew

8.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
WestJet
7.2
Good
3,339 reviews
United Airlines
7.4
Good
9,732 reviews
Check prices

Boarding

7.7

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Crew

8.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
Air Canada
7.1
Good
11,062 reviews
United Airlines
7.4
Good
9,732 reviews
Check prices

Boarding

7.7

Overall

7.4

Comfort

7.3

Entertainment

7.1

Food

6.6

Crew

8.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.

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 4 different airlines.

  • How long is the flight from Montreal to Seattle?

    Departing from Montreal to Seattle will take you 9h 24m. The distance from Montreal to Seattle is about 3663 km. Both multi-stop and direct flights can be found to your destination and back.

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

    Delta, at C$ 279, was found to be the cheapest airline from Montreal to Seattle.Alternate airlines to your destination round-trip include WestJet and United 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, June is the cheapest month in which you can book a flight from Montreal to Seattle (average of C$ 228). Flying from Montreal to Seattle in February is currently the most expensive (average of C$ 443). 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
Leavenworth
Kent
Mukilteo
Renton
Tacoma
Bothell
Cashmere
Olympia
Marysville
Kirkland
Tukwila

Browse thousands of different options on Cheapflights for your next trip

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Top 4 airlines flying from Montreal to Seattle

Discover the top 4 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 19 May 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 279AverageC$ 662FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
WestJetCheapestC$ 411AverageC$ 519FlexibilityNo cancel feeOn-time60%
Search WestJet flights
United AirlinesCheapestC$ 463AverageC$ 716FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 523AverageC$ 689FlexibilityNo 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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