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Cheap flights from Montreal to Seattle from C$ 197
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 23/10. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — SEA
17 Oct — 24 Oct1
Cheapflights Tip: The best prices from Montreal to Seattle/Tacoma Intl are usually found in August or October, booked 34 days in advance, depart on a Friday or Wednesday 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 17 September 2025.
Find flight deals from Montreal to Seattle
Cheapest flights from Montreal to SeattleExplore 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 17 September 2025.
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 17 September 2025.
Tue 21/106:45 a.m.YUL - SEA
2 stops33h 14mWestJet
Wed 29/103:10 p.m.SEA - YUL
2 stops30h 33mWestJet
Deal found 14/9C$ 457
Sat 11/105:30 p.m.YUL - SEA
2 stops22h 05mMultiple Airlines
Thu 30/103:10 p.m.SEA - YUL
1 stop19h 22mMultiple Airlines
Deal found 14/9C$ 459
Sun 23/117:30 a.m.YUL - SEA
1 stop17h 40mAmerican Airlines
Tue 2/1212:41 a.m.SEA - YUL
2 stops11h 29mAmerican Airlines
Deal found 16/9C$ 461
Sat 11/105:30 p.m.YUL - SEA
2 stops22h 05mMultiple Airlines
Mon 27/1011:10 p.m.SEA - YUL
1 stop14h 17mMultiple Airlines
Deal found 15/9C$ 462
Sat 4/108:00 a.m.YUL - SEA
2 stops13h 36mAir Canada
Tue 14/102:55 p.m.SEA - YUL
2 stops13h 15mAir Canada
Deal found 16/9C$ 464
Thu 2/106:00 a.m.YUL - SEA
1 stop7h 59mAir Canada
Mon 6/107:15 p.m.SEA - YUL
2 stops11h 37mAir Canada
Deal found 15/9C$ 472
Sat 11/106:00 a.m.YUL - SEA
1 stop11h 35mDelta
Thu 30/106:00 a.m.SEA - YUL
1 stop6h 49mDelta
Deal found 15/9C$ 473
Tue 30/98:40 a.m.YUL - SEA
2 stops16h 36mAir Canada
Tue 14/102:55 p.m.SEA - YUL
2 stops13h 15mAir Canada
Deal found 16/9C$ 477
Mon 6/109:50 p.m.YUL - SEA
1 stop16h 09mAir Canada
Tue 14/107:15 a.m.SEA - YUL
Nonstop5h 13mAir Canada
Deal found 16/9C$ 479
Sat 11/108:00 a.m.YUL - SEA
2 stops17h 31mAir Canada
Wed 29/1010:05 a.m.SEA - YUL
2 stops12h 48mAir Canada
Deal found 15/9C$ 483
Sun 12/105:30 p.m.YUL - SEA
2 stops16h 41mMultiple Airlines
Mon 20/102:05 p.m.SEA - YUL
1 stop7h 36mMultiple Airlines
Deal found 15/9C$ 484
Tue 30/94:45 p.m.YUL - SEA
Nonstop5h 46mAir Canada
Mon 13/102:55 p.m.SEA - YUL
2 stops13h 15mAir Canada
Deal found 15/9C$ 486
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 17 September 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 14/10
6:00 a.m.-2:35 p.m.
1 stop11h 35m
Seattle/Tacoma Intl
Tue 21/10
11:15 p.m.-12:02 p.m.
1 stop9h 47m
C$ 462
MontrealSeattle
YUL - SEA
YULSEA
Montreal Pierre Elliott Trudeau Intl
Thu 2/10
6:00 a.m.-10:59 a.m.
1 stop7h 59m
Seattle/Tacoma Intl
Mon 6/10
7:15 p.m.-9:52 a.m.
2 stops11h 37m
C$ 472
MontrealSeattle
YUL - SEA
YULSEA
Montreal Pierre Elliott Trudeau Intl
Mon 20/10
7:40 p.m.-12:59 p.m.
1 stop20h 19m
Seattle/Tacoma Intl
Fri 24/10
1:50 p.m.-12:41 a.m.
1 stop7h 51m
C$ 486
MontrealSeattle
YUL - SEA
YULSEA
Montreal Pierre Elliott Trudeau Intl
Fri 3/10
9:45 a.m.-3:45 p.m.
1 stop9h 00m
Seattle/Tacoma Intl
Mon 13/10
7:15 a.m.-3:28 p.m.
Nonstop5h 13m
C$ 491
MontrealSeattle
YUL - SEA
YULSEA
Montreal Pierre Elliott Trudeau Intl
Tue 30/9
5:00 a.m.-10:59 a.m.
1 stop8h 59m
Seattle/Tacoma Intl
Mon 13/10
7:15 a.m.-3:28 p.m.
Nonstop5h 13m
C$ 501
MontrealSeattle
YUL - SEA
YULSEA
Montreal Pierre Elliott Trudeau Intl
Fri 3/10
6:00 a.m.-10:59 a.m.
1 stop7h 59m
Seattle/Tacoma Intl
Mon 13/10
7:15 a.m.-3:28 p.m.
Nonstop5h 13m
C$ 501
MontrealSeattle
YUL - SEA
YULSEA
Montreal Pierre Elliott Trudeau Intl
Fri 3/10
9:45 a.m.-3:45 p.m.
1 stop9h 00m
Seattle/Tacoma Intl
Sun 5/10
6:35 a.m.-8:28 p.m.
1 stop10h 53m
C$ 503
MontrealSeattle
YUL - SEA
YULSEA
Montreal Pierre Elliott Trudeau Intl
Sat 4/10
6:00 a.m.-10:59 a.m.
1 stop7h 59m
Seattle/Tacoma Intl
Mon 13/10
12:00 p.m.-12:40 a.m.
1 stop9h 40m
C$ 509
MontrealSeattle
YUL - SEA
YULSEA
Montreal Pierre Elliott Trudeau Intl
Fri 3/10
9:45 a.m.-6:49 p.m.
1 stop12h 04m
Seattle/Tacoma Intl
Tue 14/10
7:15 a.m.-3:28 p.m.
Nonstop5h 13m
C$ 512
MontrealSeattle
YUL - SEA
YULSEA
Montreal Pierre Elliott Trudeau Intl
Thu 19/2
6:45 a.m.-8:02 p.m.
2 stops16h 17m
Seattle/Tacoma Intl
Sun 1/3
3:10 p.m.-7:05 a.m.
1 stop12h 55m
C$ 530
Showing 1-10 of 19 results
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 12 September 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 17 September 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 17 September 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).
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 45% 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 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 17 September 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.
Crew
8.1
Boarding
7.7
Overall
7.4
Comfort
7.3
Entertainment
7.1
Food
6.6
Reviews
1 / 20
10.0
ExcellentJulia,Sep 2025
BUF - DEN
Crew
8.1
Boarding
7.7
Overall
7.4
Comfort
7.3
Entertainment
7.1
Food
6.6
Reviews
1 / 20
10.0
ExcellentJulia,Sep 2025
BUF - DEN
Crew
8.1
Boarding
7.7
Overall
7.4
Comfort
7.3
Entertainment
7.1
Food
6.6
Reviews
1 / 20
10.0
ExcellentJulia,Sep 2025
BUF - DEN
Crew
8.1
Boarding
7.7
Overall
7.4
Comfort
7.3
Entertainment
7.1
Food
6.6
Reviews
1 / 20
10.0
ExcellentJulia,Sep 2025
BUF - DEN
Crew
8.1
Boarding
7.7
Overall
7.4
Comfort
7.3
Entertainment
7.1
Food
6.6
Reviews
1 / 20
10.0
ExcellentJulia,Sep 2025
BUF - DEN
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.
Travelling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsLeavenworth
SeaTac
Tukwila
Tacoma
Bothell
Cashmere
Renton
Olympia
Marysville
Lynnwood
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Montreal to Seattle
See prices for flight routes from nearby airports that may be better suited for you.
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 17 September 2025.
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!