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Cheap flights from Montreal to Seattle from C$ 238

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 16/9. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — SEA
23 Aug — 30 Aug1
1 adult

Cheapflights Tip: The best prices from Montreal to Seattle/Tacoma Intl are usually found in October or August, booked 34 days in advance, depart on a Friday or Tuesday and return on a Friday

Cheap 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 August 2025.

Round-trip from

C$ 529

One-way from

C$ 238

Popular in

December

Cheapest in

October

Average price

C$ 674

Good round-trip deal

C$ 553 or less

Good one-way deal

C$ 300 or less
WestJet
  • WestJet
  • 1/10-14/10
  • 2 total stops
  • 18h 35m total
  • Montreal to Seattle
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WestJet
  • WestJet
  • 16/9
  • 1 total stop
  • 8h 59m total
  • Montreal to Seattle
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Highest demand for flights based on searches. 4% potential increase in price (C$ 43 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 21 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Montreal (YMQ) to Seattle/Tacoma Intl.
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Price to beat on a one-way flight from Montreal (YMQ) to Seattle/Tacoma Intl.
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Find flight deals from Montreal to Seattle

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 August 2025.

Wed 1/107:00 a.m.YUL - SEA
1 stop10h 59mMultiple Airlines
Tue 14/102:05 p.m.SEA - YUL
1 stop7h 36mMultiple Airlines
Deal found 17/8C$ 529
Wed 24/97:00 a.m.YUL - SEA
1 stop10h 59mMultiple Airlines
Wed 8/101:50 p.m.SEA - YUL
1 stop7h 51mMultiple Airlines
Deal found 16/8C$ 531
Fri 26/98:10 a.m.YUL - SEA
1 stop9h 49mMultiple Airlines
Sun 12/102:05 p.m.SEA - YUL
1 stop7h 36mMultiple Airlines
Deal found 16/8C$ 532
Fri 26/94:45 p.m.YUL - SEA
Nonstop5h 46mAir Canada
Sat 4/107:15 a.m.SEA - YUL
Nonstop5h 13mAir Canada
Deal found 16/8C$ 533
Fri 26/98:10 a.m.YUL - SEA
2 stops13h 02mMultiple Airlines
Wed 8/101:50 p.m.SEA - YUL
1 stop7h 51mMultiple Airlines
Deal found 16/8C$ 535
Sun 5/107:00 a.m.YUL - SEA
1 stop10h 55mMultiple Airlines
Tue 14/102:05 p.m.SEA - YUL
2 stops21h 04mMultiple Airlines
Deal found 17/8C$ 536
Sun 31/89:45 a.m.YUL - SEA
1 stop8h 47mMultiple Airlines
Sun 7/97:15 a.m.SEA - YUL
Nonstop5h 13mMultiple Airlines
Deal found 17/8C$ 539
Sat 6/94:45 p.m.YUL - SEA
Nonstop5h 46mAir Canada
Sat 18/1010:00 a.m.SEA - YUL
1 stop7h 50mAir Canada
Deal found 16/8C$ 540
Thu 2/105:30 p.m.YUL - SEA
2 stops22h 03mWestJet
Tue 14/107:05 a.m.SEA - YUL
2 stops14h 22mWestJet
Deal found 17/8C$ 542
Wed 1/106:45 a.m.YUL - SEA
2 stops33h 14mWestJet
Wed 8/101:50 p.m.SEA - YUL
2 stops31h 37mWestJet
Deal found 16/8C$ 544
Thu 25/96:00 p.m.YUL - SEA
2 stops16h 16mMultiple Airlines
Sun 12/102:05 p.m.SEA - YUL
1 stop7h 36mMultiple Airlines
Deal found 16/8C$ 546

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 August 2025.
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

Wed 1/10

7:00 a.m.-2:59 p.m.

1 stop10h 59m

Seattle/Tacoma Intl

Tue 14/10

2:05 p.m.-12:41 a.m.

1 stop7h 36m

C$ 529

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Tue 9/9

6:45 a.m.-12:59 p.m.

2 stops33h 14m

Seattle/Tacoma Intl

Wed 17/9

1:50 p.m.-12:27 a.m.

2 stops31h 37m

C$ 531

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 15/9

6:35 p.m.-10:20 a.m.

1 stop18h 45m

Seattle/Tacoma Intl

Mon 22/9

7:55 a.m.-2:09 p.m.

1 stop27h 14m

C$ 531

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Wed 1/10

7:00 a.m.-2:59 p.m.

1 stop10h 59m

Seattle/Tacoma Intl

Mon 13/10

2:05 p.m.-12:41 a.m.

1 stop7h 36m

C$ 531

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Wed 24/9

7:00 a.m.-2:59 p.m.

1 stop10h 59m

Seattle/Tacoma Intl

Sat 11/10

1:50 p.m.-12:41 a.m.

1 stop7h 51m

C$ 531

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Thu 2/10

6:45 a.m.-7:14 p.m.

2 stops15h 29m

Seattle/Tacoma Intl

Tue 14/10

7:05 a.m.-12:27 a.m.

2 stops14h 22m

C$ 532

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Fri 26/9

8:10 a.m.-2:59 p.m.

1 stop9h 49m

Seattle/Tacoma Intl

Tue 7/10

2:05 p.m.-12:41 a.m.

1 stop7h 36m

C$ 532

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Fri 26/9

8:10 a.m.-2:59 p.m.

1 stop9h 49m

Seattle/Tacoma Intl

Sun 12/10

2:05 p.m.-12:41 a.m.

1 stop7h 36m

C$ 532

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Fri 26/9

4:45 p.m.-7:31 p.m.

Nonstop5h 46m

Seattle/Tacoma Intl

Sat 4/10

7:15 a.m.-3:28 p.m.

Nonstop5h 13m

C$ 533

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Tue 23/9

4:45 p.m.-7:31 p.m.

Nonstop5h 46m

Seattle/Tacoma Intl

Tue 30/9

7:15 a.m.-3:28 p.m.

Nonstop5h 13m

C$ 533

Flights are sorted by cheapest round-trip flights first.

Deals found on 17/8

Showing 1-10 of 18 results
1
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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 8 August 2025.

Booking 34 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, January is the cheapest month in which you can book a flight from Montreal to Seattle (average of C$ 262). Flying from Montreal to Seattle in December is currently the most expensive (average of C$ 353). 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.

What is the cheapest time of day to fly from YMQ to SEA?

Find hourly flight availability from Montreal to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 18 August 2025.

A simple way to save on the total cost of your ticket is to fly from Montreal to Seattle in the evening. If you’re flexible enough to do this you can expect to save up to 26% on your trip compared to booking a flight at noon.

Weekly flight availability from Montreal to Seattle

Explore weekly flight availability from Montreal to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 18 August 2025.

The most flights from YMQ to SEA are scheduled on a Monday (2 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).

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 46% 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$ 582.

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 24m.

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 19m.

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 August 2025.
Read through reviews of airlines operating flights from Montreal to Seattle, such as United Airlines,American Airlines, andWestJet. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,925 reviews
Check prices

Crew

8.1

Food

6.6

Comfort

7.3

Entertainment

7.1

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Apr 2025

TPE - SFO

The boarding experience was okay. The dietary food choices were limited, the midway snacks were hard and dry. The seat was uncomfortable - stiff seat cushion, seat back kept springing back to the upright position, narrow seat width. Love the app and the ability to track my luggage. Flight crew was efficient.
United Airlines
7.4
Good
8,925 reviews
United Airlines
7.4
Good
8,925 reviews
Check prices

Crew

8.1

Food

6.6

Comfort

7.3

Entertainment

7.1

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Apr 2025

TPE - SFO

The boarding experience was okay. The dietary food choices were limited, the midway snacks were hard and dry. The seat was uncomfortable - stiff seat cushion, seat back kept springing back to the upright position, narrow seat width. Love the app and the ability to track my luggage. Flight crew was efficient.
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,925 reviews
Check prices

Crew

8.1

Food

6.6

Comfort

7.3

Entertainment

7.1

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Apr 2025

TPE - SFO

The boarding experience was okay. The dietary food choices were limited, the midway snacks were hard and dry. The seat was uncomfortable - stiff seat cushion, seat back kept springing back to the upright position, narrow seat width. Love the app and the ability to track my luggage. Flight crew was efficient.
WestJet
7.2
Good
3,018 reviews
United Airlines
7.4
Good
8,925 reviews
Check prices

Crew

8.1

Food

6.6

Comfort

7.3

Entertainment

7.1

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Apr 2025

TPE - SFO

The boarding experience was okay. The dietary food choices were limited, the midway snacks were hard and dry. The seat was uncomfortable - stiff seat cushion, seat back kept springing back to the upright position, narrow seat width. Love the app and the ability to track my luggage. Flight crew was efficient.
Air Canada
7.1
Good
9,992 reviews
United Airlines
7.4
Good
8,925 reviews
Check prices

Crew

8.1

Food

6.6

Comfort

7.3

Entertainment

7.1

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Apr 2025

TPE - SFO

The boarding experience was okay. The dietary food choices were limited, the midway snacks were hard and dry. The seat was uncomfortable - stiff seat cushion, seat back kept springing back to the upright position, narrow seat width. Love the app and the ability to track my luggage. Flight crew was efficient.

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 2 daily inbound flights from Montreal from 5 different airlines.

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

    WestJet, at C$ 368, was found to be the cheapest airline from Montreal to Seattle.Alternate airlines to your destination round-trip include Delta and Air Canada. WestJet is 49% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest flights from Montreal to Seattle?

    While on average a flight from Montreal to Seattle is generally C$ 443, our data shows the cheapest flight currently is C$ 298. When looking at the most popular route, (Montreal Pierre Elliott Trudeau Intl - Seattle/Tacoma Intl), you can expect to pay C$ 439 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, January is the cheapest month in which you can book a flight from Montreal to Seattle (average of C$ 262). Flying from Montreal to Seattle in December is currently the most expensive (average of C$ 353). 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
Tukwila
Tacoma
Bothell
Renton
Olympia
Marysville
Lynnwood

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 18 August 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 368AverageC$ 561FlexibilityNo cancel feeOn-time60%
Search WestJet flights
DeltaCheapestC$ 497AverageC$ 624FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air CanadaCheapestC$ 509AverageC$ 708FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapestC$ 530AverageC$ 699FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapestC$ 535AverageC$ 729FlexibilityNo 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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