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Cheap flights from Montreal to Seattle from C$ 273

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 15/9. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — SEA
8 Jul — 15 Jul1
1 adult

Cheapflights Tip: The best prices from Montreal to Seattle/Tacoma Intl are usually found in August or October, booked 30 days in advance, depart on a Friday or Tuesday and return on a Wednesday

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 3 July 2025.

Round-trip from

C$ 538

One-way from

C$ 273

Popular in

December

Cheapest in

August

Average price

C$ 759

Good round-trip deal

C$ 617 or less

Good one-way deal

C$ 380 or less
WestJet
  • WestJet
  • 25/7-29/7
  • 2 total stops
  • 16h 36m total
  • Montreal to Seattle
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15/9
  • 15/9
  • 2 total stops
  • 22h 42m total
  • Montreal to Seattle
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Highest demand for flights based on searches. 3% potential increase in price (C$ 32 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 19 potential savings vs. average RT price).
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Average for round-trip flights in July 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 3 July 2025.

Fri 25/77:00 a.m.YUL - SEA
1 stop8h 58mWestJet
Tue 29/72:05 p.m.SEA - YUL
1 stop7h 38mWestJet
Deal found 1/7C$ 538
Wed 3/98:25 a.m.YUL - SEA
1 stop8h 51mAir Canada
Wed 10/97:15 a.m.SEA - YUL
Nonstop5h 13mAir Canada
Deal found 3/7C$ 544
Sun 19/107:00 a.m.YUL - SEA
1 stop8h 59mMultiple Airlines
Fri 31/103:20 p.m.SEA - YUL
1 stop19h 09mMultiple Airlines
Deal found 3/7C$ 555
Sat 25/109:45 a.m.YUL - SEA
1 stop9h 00mUnited Airlines
Thu 30/105:05 a.m.SEA - YUL
2 stops13h 25mUnited Airlines
Deal found 3/7C$ 578
Tue 21/1010:30 a.m.YUL - SEA
2 stops16h 57mAmerican Airlines
Wed 29/1012:34 a.m.SEA - YUL
1 stop8h 01mAmerican Airlines
Deal found 3/7C$ 587

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 July 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

Fri 25/7

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

1 stop8h 58m

Seattle/Tacoma Intl

Tue 29/7

2:05 p.m.-12:43 a.m.

1 stop7h 38m

C$ 538

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Wed 3/9

8:25 a.m.-2:16 p.m.

1 stop8h 51m

Seattle/Tacoma Intl

Wed 10/9

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

Nonstop5h 13m

C$ 544

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Thu 4/9

6:45 a.m.-4:58 p.m.

2 stops13h 13m

Seattle/Tacoma Intl

Tue 9/9

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

1 stop7h 36m

C$ 566

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Thu 4/9

11:23 a.m.-9:22 p.m.

2 stops12h 59m

Seattle/Tacoma Intl

Tue 9/9

7:10 a.m.-10:06 p.m.

2 stops11h 56m

C$ 586

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Tue 12/8

5:29 p.m.-9:19 a.m.

1 stop18h 50m

Seattle/Tacoma Intl

Fri 15/8

12:46 a.m.-10:59 p.m.

2 stops19h 13m

C$ 609

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 15/9

1:10 p.m.-8:52 a.m.

2 stops22h 42m

C$ 273

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Wed 3/9

7:00 a.m.-12:59 p.m.

1 stop8h 59m

C$ 283

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Wed 3/9

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

Nonstop5h 46m

C$ 316

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sun 28/9

9:45 a.m.-4:31 p.m.

1 stop9h 46m

C$ 322

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sat 27/9

9:45 a.m.-3:45 p.m.

1 stop9h 00m

C$ 326

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/7

Showing 1-10 of 11 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 27 June 2025.

Booking 30 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 3 July 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 27% 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 3 July 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).

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 July 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
8,861 reviews
Check prices

Boarding

7.7

Food

6.6

Crew

8.1

Comfort

7.3

Entertainment

7.0

Overall

7.4

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
8,861 reviews
United Airlines
7.4
Good
8,861 reviews
Check prices

Boarding

7.7

Food

6.6

Crew

8.1

Comfort

7.3

Entertainment

7.0

Overall

7.4

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
8,861 reviews
Check prices

Boarding

7.7

Food

6.6

Crew

8.1

Comfort

7.3

Entertainment

7.0

Overall

7.4

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
2,917 reviews
United Airlines
7.4
Good
8,861 reviews
Check prices

Boarding

7.7

Food

6.6

Crew

8.1

Comfort

7.3

Entertainment

7.0

Overall

7.4

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
9,681 reviews
United Airlines
7.4
Good
8,861 reviews
Check prices

Boarding

7.7

Food

6.6

Crew

8.1

Comfort

7.3

Entertainment

7.0

Overall

7.4

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.
Sun Country Air
6.9
Okay
339 reviews
United Airlines
7.4
Good
8,861 reviews
Check prices

Boarding

7.7

Food

6.6

Crew

8.1

Comfort

7.3

Entertainment

7.0

Overall

7.4

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$ 538, was found to be the cheapest airline from Montreal to Seattle.Alternate airlines to your destination round-trip include Air Canada and United Airlines. WestJet is 25% 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$ 283), Air Canada (C$ 307), and Sun Country Air (C$ 322).

  • What are the cheapest flights from Montreal to Seattle?

    While on average a flight from Montreal to Seattle is generally C$ 531, our data shows the cheapest flight currently is C$ 307. When looking at the most popular route, (Montreal Pierre Elliott Trudeau Intl - Seattle/Tacoma Intl), you can expect to pay C$ 512 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 Montreal?

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

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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 July 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 356AverageC$ 548FlexibilityNo cancel feeOn-time60%
Search WestJet flights
DeltaCheapestC$ 490AverageC$ 619FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air CanadaCheapestC$ 502AverageC$ 696FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapestC$ 522AverageC$ 689FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapestC$ 528AverageC$ 719FlexibilityNo 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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