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Cheap flights from Montreal to Seattle from C$ 255

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 9/6. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — SEA
4 May — 11 May1
1 adult

Cheapflights Tip: The best prices from Montreal to Seattle/Tacoma Intl are usually found in August or October, booked 17 days in advance, depart on a Friday or Thursday and return on a Sunday

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 29 April 2025.

Round-trip from

C$ 495

One-way from

C$ 255

Popular in

December

Cheapest in

August

Average price

C$ 837

Good round-trip deal

C$ 519 or less

Good one-way deal

C$ 292 or less
11/6-16/6
  • 11/6-16/6
  • 3 total stops
  • 32h 28m total
  • Montreal to Seattle
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WestJet
  • WestJet
  • 9/6
  • 1 total stop
  • 8h 58m total
  • Montreal to Seattle
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Highest demand for flights based on searches. 1% potential increase in price (C$ 14 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 15 potential savings vs. average RT price).
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Average for round-trip flights in April 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 29 April 2025.

Tue 29/77:00 a.m.YUL - SEA
1 stop8h 58mWestJet
Thu 7/87:05 a.m.SEA - YUL
2 stops14h 32mWestJet
Deal found 28/4C$ 499
Mon 2/65:40 p.m.YUL - SEA
2 stops29h 48mMultiple Airlines
Fri 13/61:15 p.m.SEA - YUL
1 stop21h 58mMultiple Airlines
Deal found 28/4C$ 564
Mon 19/56:15 a.m.YUL - SEA
2 stops9h 15mDelta
Sun 25/57:25 a.m.SEA - YUL
2 stops12h 54mDelta
Deal found 28/4C$ 676
Mon 19/54:45 p.m.YUL - SEA
Nonstop5h 52mAir Canada
Sun 25/57:20 a.m.SEA - YUL
Nonstop5h 10mAir Canada
Deal found 28/4C$ 704
Mon 19/512:30 p.m.YUL - SEA
1 stop24h 45mAmerican Airlines
Sun 25/511:20 a.m.SEA - YUL
1 stop21h 24mAmerican Airlines
Deal found 28/4C$ 734
Mon 19/54:45 p.m.YUL - SEA
Nonstop5h 52mUnited Airlines
Sun 25/510:15 p.m.SEA - YUL
1 stop18h 30mUnited Airlines
Deal found 28/4C$ 741

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 29 April 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

Tue 29/7

7:00 a.m.-12:58 p.m.

1 stop8h 58m

Seattle/Tacoma Intl

Thu 7/8

7:05 a.m.-12:37 a.m.

2 stops14h 32m

C$ 499

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 2/6

5:40 p.m.-8:28 p.m.

2 stops29h 48m

Seattle/Tacoma Intl

Fri 13/6

1:15 p.m.-2:13 p.m.

1 stop21h 58m

C$ 564

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 19/5

6:15 a.m.-12:30 p.m.

2 stops9h 15m

Seattle/Tacoma Intl

Sun 25/5

7:25 a.m.-11:19 p.m.

2 stops12h 54m

C$ 676

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 19/5

4:45 p.m.-7:37 p.m.

Nonstop5h 52m

Seattle/Tacoma Intl

Sun 25/5

7:20 a.m.-3:30 p.m.

Nonstop5h 10m

C$ 704

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 19/5

12:30 p.m.-10:15 a.m.

1 stop24h 45m

Seattle/Tacoma Intl

Sun 25/5

11:20 a.m.-11:44 a.m.

1 stop21h 24m

C$ 734

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 19/5

4:45 p.m.-7:37 p.m.

Nonstop5h 52m

Seattle/Tacoma Intl

Sun 25/5

10:15 p.m.-7:45 p.m.

1 stop18h 30m

C$ 741

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sat 9/8

12:30 p.m.-11:50 p.m.

1 stop14h 20m

Seattle/Tacoma Intl

Thu 21/8

12:57 a.m.-2:54 p.m.

1 stop10h 57m

C$ 1,039

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sat 31/5

6:45 a.m.-11:33 a.m.

2 stops31h 48m

C$ 261

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 2/6

6:45 a.m.-12:58 p.m.

2 stops33h 13m

C$ 279

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Fri 6/6

12:44 p.m.-9:14 p.m.

2 stops11h 30m

C$ 380

Flights are sorted by cheapest round-trip flights first.

Deals found on 28/4

Showing 1-10 of 13 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 25 April 2025.

Booking 17 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$ 261). 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 29 April 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.

Rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Seattle ranges from 18.0 - 168.0 mm per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit Seattle when rainfall is around 18.0 mm.

Temperature in Seattle by month

Plan your trip to Seattle by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

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 29 April 2025.
See what other customers who have flown with Delta, United Airlines and American Airlines from Montreal to Seattle have to say. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,929 reviews
Check prices

Crew

8.5

Entertainment

7.9

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,929 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Crew

8.5

Entertainment

7.9

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,696 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Crew

8.5

Entertainment

7.9

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Crew

8.5

Entertainment

7.9

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
WestJet
7.2
Good
2,823 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Crew

8.5

Entertainment

7.9

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Air Canada
7.0
Good
9,240 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Crew

8.5

Entertainment

7.9

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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.

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

    WestJet, at C$ 496, 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 32% 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$ 255), Delta (C$ 380), and Air Canada (C$ 402).

  • What are the cheapest flights from Montreal to Seattle?

    While on average a flight from Montreal to Seattle is generally C$ 509, our data shows the cheapest flight currently is C$ 292. When looking at the most popular route, (Montreal Pierre Elliott Trudeau Intl - Seattle/Tacoma Intl), you can expect to pay C$ 467 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$ 261). 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 Montreal?

Book flights to Montreal if you plan to visit one of these locations
Tukwila
SeaTac
Tacoma
Marysville
Bothell
Olympia
Lynnwood
Leavenworth

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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 29 April 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapestC$ 259AverageC$ 719FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
WestJetCheapestC$ 362AverageC$ 563FlexibilityNo cancel feeOn-time60%
Search WestJet flights
DeltaCheapestC$ 509AverageC$ 629FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air CanadaCheapestC$ 510AverageC$ 729FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 547AverageC$ 749FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Montreal to Seattle?

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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.

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