Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Montreal to Seattle from C$ 222

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 14/1. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — SEA
10 Dec — 17 Dec1
1 adult
1 adult, Economy, 0 bags

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

Find 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 10 November 2025.

Wed 24/126:45 a.m.YUL - SEA
2 stops17h 13mMultiple Airlines
Sun 11/13:10 p.m.SEA - YUL
1 stop12h 55mMultiple Airlines
Deal found 10/11C$ 507
Mon 1/127:30 p.m.YUL - SEA
1 stop21h 50mWestJet
Mon 8/123:10 p.m.SEA - YUL
1 stop12h 55mWestJet
Deal found 9/11C$ 510
Wed 24/126:45 a.m.YUL - SEA
2 stops17h 13mMultiple Airlines
Wed 14/13:10 p.m.SEA - YUL
1 stop12h 55mMultiple Airlines
Deal found 9/11C$ 525
Sat 6/127:10 a.m.YUL - SEA
2 stops11h 25mDelta
Mon 8/129:35 p.m.SEA - YUL
2 stops11h 25mDelta
Deal found 9/11C$ 528
Wed 24/126:45 a.m.YUL - SEA
2 stops17h 13mMultiple Airlines
Mon 12/13:10 p.m.SEA - YUL
1 stop12h 55mMultiple Airlines
Deal found 9/11C$ 529
Sat 6/126:45 a.m.YUL - SEA
2 stops34h 35mWestJet
Mon 8/123:10 p.m.SEA - YUL
1 stop12h 55mWestJet
Deal found 9/11C$ 536
Fri 5/127:30 p.m.YUL - SEA
1 stop22h 10mWestJet
Tue 16/123:10 p.m.SEA - YUL
1 stop12h 55mWestJet
Deal found 8/11C$ 544
Sat 6/126:00 p.m.YUL - SEA
1 stop23h 20mMultiple Airlines
Mon 8/123:10 p.m.SEA - YUL
1 stop19h 22mMultiple Airlines
Deal found 9/11C$ 552
Tue 23/1211:25 a.m.YUL - SEA
2 stops24h 20mMultiple Airlines
Sun 11/13:10 p.m.SEA - YUL
1 stop12h 55mMultiple Airlines
Deal found 9/11C$ 553

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 10 November 2025.

Round-trip from

C$ 320

One-way from

C$ 222

Popular in

November

Cheapest in

September

Average price

C$ 994

Good round-trip deal

C$ 1,327 or less
WestJet
  • WestJet
  • 8/5-17/5
  • 2 total stops
  • 24h 00m total
  • Montreal to Seattle
Search Deals
WestJet
  • WestJet
  • 14/1
  • 1 total stop
  • 21h 50m total
  • Montreal to Seattle
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (C$ 126 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals
Price to beat on a round-trip flight from Montreal (YMQ) to Seattle/Tacoma Intl.
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 10 November 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

Mon 5/1

6:45 a.m.-8:45 a.m.

2 stops29h 00m

Seattle/Tacoma Intl

Sun 11/1

3:10 p.m.-7:05 a.m.

1 stop12h 55m

C$ 462

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Wed 24/12

6:45 a.m.-8:58 p.m.

2 stops17h 13m

Seattle/Tacoma Intl

Sun 11/1

3:10 p.m.-7:05 a.m.

1 stop12h 55m

C$ 507

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Fri 5/12

7:30 p.m.-2:40 p.m.

1 stop22h 10m

Seattle/Tacoma Intl

Tue 16/12

3:10 p.m.-7:05 a.m.

1 stop12h 55m

C$ 544

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Fri 12/12

6:45 a.m.-4:46 p.m.

2 stops13h 01m

Seattle/Tacoma Intl

Sun 14/12

3:10 p.m.-7:05 a.m.

1 stop12h 55m

C$ 569

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Fri 5/12

12:40 p.m.-11:59 p.m.

1 stop14h 19m

Seattle/Tacoma Intl

Tue 16/12

9:45 a.m.-11:47 p.m.

2 stops11h 02m

C$ 570

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Fri 19/12

6:45 a.m.-6:16 p.m.

2 stops14h 31m

Seattle/Tacoma Intl

Sun 11/1

3:10 p.m.-7:05 a.m.

1 stop12h 55m

C$ 624

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Wed 17/12

7:00 a.m.-5:47 p.m.

1 stop13h 47m

Seattle/Tacoma Intl

Tue 13/1

7:25 a.m.-11:50 p.m.

2 stops13h 25m

C$ 677

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Wed 26/11

12:45 p.m.-8:50 p.m.

1 stop11h 05m

Seattle/Tacoma Intl

Mon 1/12

7:15 a.m.-11:42 p.m.

2 stops13h 27m

C$ 690

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Thu 25/12

2:40 p.m.-11:31 p.m.

1 stop11h 51m

Seattle/Tacoma Intl

Tue 13/1

12:00 p.m.-11:50 p.m.

1 stop8h 50m

C$ 697

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Thu 25/12

2:40 p.m.-11:31 p.m.

1 stop11h 51m

Seattle/Tacoma Intl

Fri 9/1

12:00 p.m.-11:50 p.m.

1 stop8h 50m

C$ 697

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/11

Showing 1-10 of 14 results
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?

Use this chart to determine the optimal time to book a round-trip flight from Montreal to Seattle. Price data was last updated on 7 November 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, November is the cheapest month in which you can book a flight from Montreal to Seattle (average of C$ 285). Flying from Montreal to Seattle in December is currently the most expensive (average of C$ 705). 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 10 November 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 52% on your trip compared to booking a flight at noon.

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 53% 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$ 580.

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 28m.

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 Vancouver (YVR) offer the fastest connection on this route, with an average layover time of 1h 47m.

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 10 November 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
9,011 reviews
Check prices

Entertainment

7.1

Overall

7.4

Comfort

7.3

Food

6.6

Boarding

7.7

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
United Airlines
7.4
Good
9,011 reviews
United Airlines
7.4
Good
9,011 reviews
Check prices

Entertainment

7.1

Overall

7.4

Comfort

7.3

Food

6.6

Boarding

7.7

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
American Airlines
7.2
Good
11,047 reviews
United Airlines
7.4
Good
9,011 reviews
Check prices

Entertainment

7.1

Overall

7.4

Comfort

7.3

Food

6.6

Boarding

7.7

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
WestJet
7.2
Good
3,156 reviews
United Airlines
7.4
Good
9,011 reviews
Check prices

Entertainment

7.1

Overall

7.4

Comfort

7.3

Food

6.6

Boarding

7.7

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
Air Canada
7.1
Good
10,429 reviews
United Airlines
7.4
Good
9,011 reviews
Check prices

Entertainment

7.1

Overall

7.4

Comfort

7.3

Food

6.6

Boarding

7.7

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

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 14h 19m. 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$ 286, 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 62% 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$ 1,327, our data shows the cheapest flight currently is C$ 1,061. When looking at the most popular route, (Montreal Pierre Elliott Trudeau Intl - Seattle/Tacoma Intl), you can expect to pay C$ 528 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, November is the cheapest month in which you can book a flight from Montreal to Seattle (average of C$ 285). Flying from Montreal to Seattle in December is currently the most expensive (average of C$ 705). 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
Mukilteo
Bothell
Cashmere
Olympia
Renton
Marysville
Lynnwood

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 10 November 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 286AverageC$ 576FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
WestJetCheapestC$ 374AverageC$ 561FlexibilityNo cancel feeOn-time60%
Search WestJet flights
American AirlinesCheapestC$ 464AverageC$ 569FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Air CanadaCheapestC$ 509AverageC$ 707FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 544AverageC$ 740FlexibilityNo 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!

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.