Cheap flights from Montreal to Seattle from C$ 217
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 16/1. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — SEA
17 Dec — 24 Dec1
Round-trip
1 adult
Economy
Round-trip
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 17 November 2025.
Fri 5/127:30 a.m.YUL - SEA
1 stop10h 01mAir Canada
Thu 11/125:50 a.m.SEA - YUL
1 stop8h 10mAir Canada
Deal found 14/11C$ 391
Fri 12/127:30 a.m.YUL - SEA
1 stop10h 01mAir Canada
Mon 15/128:10 a.m.SEA - YUL
1 stop9h 12mAir Canada
Deal found 15/11C$ 400
Sat 6/122:13 p.m.YUL - SEA
1 stop9h 41mUnited Airlines
Tue 9/128:10 a.m.SEA - YUL
1 stop8h 38mUnited Airlines
Deal found 15/11C$ 412
Fri 12/126:00 a.m.YUL - SEA
2 stops20h 15mUnited Airlines
Mon 15/123:25 p.m.SEA - YUL
2 stops19h 35mUnited Airlines
Deal found 15/11C$ 417
Fri 12/1212:40 p.m.YUL - SEA
1 stop14h 18mDelta
Tue 16/127:15 a.m.SEA - YUL
2 stops13h 32mDelta
Deal found 15/11C$ 471
Thu 25/124:10 p.m.YUL - SEA
1 stop9h 06mAir Canada
Wed 31/128:10 a.m.SEA - YUL
1 stop8h 12mAir Canada
Deal found 15/11C$ 513
Thu 18/1210:10 a.m.YUL - SEA
1 stop15h 06mAir Canada
Thu 8/18:00 p.m.SEA - YUL
2 stops10h 22mAir Canada
Deal found 15/11C$ 517
Thu 18/127:00 a.m.YUL - SEA
1 stop13h 47mDelta
Thu 8/18:15 a.m.SEA - YUL
1 stop12h 35mDelta
Deal found 15/11C$ 543
Best flights from Montreal to Seattle
Discover carefully curated flight deals from Montreal to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 17 November 2025.
Fri 16/17:30 p.m.YUL - SEA
1 stop22h 08mWestJet
Fri 30/13:10 p.m.SEA - YUL
1 stop12h 55mWestJet
Deal found 15/11C$ 359
Fri 5/128:05 a.m.YUL - SEA
2 stops9h 26mAir Canada
Thu 11/125:50 a.m.SEA - YUL
1 stop8h 10mAir Canada
Deal found 14/11C$ 398
Sat 6/126:00 a.m.YUL - SEA
1 stop8h 47mUnited Airlines
Tue 9/1211:59 p.m.SEA - YUL
2 stops18h 43mUnited Airlines
Deal found 15/11C$ 417
Sat 14/26:45 a.m.YUL - SEA
2 stops34h 34mWestJet
Sun 31/57:05 a.m.SEA - YUL
2 stops14h 35mWestJet
Deal found 15/11C$ 374
Thu 11/126:00 a.m.YUL - SEA
2 stops20h 15mUnited Airlines
Mon 15/125:11 p.m.SEA - YUL
2 stops17h 49mUnited Airlines
Deal found 15/11C$ 417
Fri 12/126:00 a.m.YUL - SEA
2 stops20h 15mUnited Airlines
Mon 15/123:25 p.m.SEA - YUL
2 stops19h 35mUnited Airlines
Deal found 15/11C$ 417
Fri 16/19:00 a.m.YUL - SEA
1 stop8h 31mAir Canada
Sun 18/15:50 a.m.SEA - YUL
2 stops10h 24mAir Canada
Deal found 16/11C$ 492
Fri 12/126:00 a.m.YUL - SEA
2 stops20h 15mUnited Airlines
Tue 16/125:00 a.m.SEA - YUL
2 stops13h 42mUnited Airlines
Deal found 15/11C$ 417
Direct flights from Montreal to Seattle
Explore direct flight options from Montreal to Seattle based on user searches, and compare prices and availability for your desired travel dates. Data last updated 17 November 2025.
Sat 2/54:45 p.m.YUL - SEA
Nonstop5h 56mAir Canada
Sat 9/58:20 a.m.SEA - YUL
Nonstop5h 09mAir Canada
Deal found 17/11C$ 673
Last-minute flights from Montreal to Seattle
Discover last-minute flight deals from Montreal to Seattle. Data last updated 17 November 2025 and is based on user searches.
Fri 5/127:30 a.m.YUL - SEA
1 stop10h 01mAir Canada
Thu 11/125:50 a.m.SEA - YUL
1 stop8h 10mAir Canada
Deal found 14/11C$ 391
Sat 6/122:13 p.m.YUL - SEA
1 stop9h 41mUnited Airlines
Tue 9/128:10 a.m.SEA - YUL
1 stop8h 38mUnited Airlines
Deal found 15/11C$ 412
Fri 12/127:30 a.m.YUL - SEA
1 stop10h 01mAir Canada
Tue 16/128:10 a.m.SEA - YUL
1 stop8h 12mAir Canada
Deal found 15/11C$ 400
Fri 12/126:00 a.m.YUL - SEA
2 stops20h 15mUnited Airlines
Mon 15/127:00 a.m.SEA - YUL
1 stop11h 17mUnited Airlines
Deal found 15/11C$ 417
Fri 12/1212:40 p.m.YUL - SEA
1 stop14h 18mDelta
Tue 16/127:15 a.m.SEA - YUL
2 stops13h 32mDelta
Deal found 15/11C$ 471
Thu 18/1210:10 a.m.YUL - SEA
1 stop15h 06mAir Canada
Thu 8/18:00 p.m.SEA - YUL
2 stops10h 22mAir Canada
Deal found 15/11C$ 517
Thu 18/127:00 a.m.YUL - SEA
1 stop13h 47mDelta
Thu 8/18:15 a.m.SEA - YUL
1 stop12h 35mDelta
Deal found 15/11C$ 543
Thu 25/124:10 p.m.YUL - SEA
1 stop9h 06mAir Canada
Wed 31/128:10 a.m.SEA - YUL
1 stop8h 12mAir Canada
Deal found 15/11C$ 513
One-way flights from Montreal to Seattle
Search for one-way flight options from Montreal to Seattle. Find affordable one-way fares based on user searches. Data last updated 17 November 2025.
Fri 16/17:30 p.m.YUL - SEA
1 stop22h 08mWestJet
Deal found 15/11C$ 217
Wed 14/17:30 p.m.YUL - SEA
1 stop21h 50mWestJet
Deal found 16/11C$ 223
Fri 12/127:30 a.m.YUL - SEA
1 stop10h 01mAir Canada
Deal found 15/11C$ 233
Tue 13/14:15 p.m.YUL - SEA
1 stop25h 05mWestJet
Deal found 15/11C$ 237
Thu 11/127:30 a.m.YUL - SEA
1 stop10h 01mAir Canada
Deal found 15/11C$ 241
Mon 15/123:10 p.m.YUL - SEA
1 stop10h 06mAir Canada
Deal found 15/11C$ 243
Thu 11/1212:40 p.m.YUL - SEA
1 stop14h 18mDelta
Deal found 17/11C$ 250
Tue 16/123:10 p.m.YUL - SEA
1 stop10h 06mAir Canada
Deal found 16/11C$ 251
Thu 11/127:00 a.m.YUL - SEA
2 stops17h 46mUnited Airlines
Deal found 17/11C$ 258
Wed 17/1211:10 a.m.YUL - SEA
1 stop14h 06mAir Canada
Deal found 17/11C$ 275
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 November 2025.
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 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
Fri 16/1
7:30 p.m.-2:38 p.m.
1 stop22h 08m
Seattle/Tacoma Intl
Fri 30/1
3:10 p.m.-7:05 a.m.
1 stop12h 55m
C$ 359
MontrealSeattle
YUL - SEA
YULSEA
Montreal Pierre Elliott Trudeau Intl
Sat 14/2
6:45 a.m.-2:19 p.m.
2 stops34h 34m
Seattle/Tacoma Intl
Sun 31/5
7:05 a.m.-12:40 a.m.
2 stops14h 35m
C$ 374
MontrealSeattle
YUL - SEA
YULSEA
Montreal Pierre Elliott Trudeau Intl
Fri 5/12
8:05 a.m.-2:31 p.m.
2 stops9h 26m
Seattle/Tacoma Intl
Thu 11/12
5:50 a.m.-5:00 p.m.
1 stop8h 10m
C$ 398
MontrealSeattle
YUL - SEA
YULSEA
Montreal Pierre Elliott Trudeau Intl
Sat 6/12
6:00 a.m.-11:47 a.m.
1 stop8h 47m
Seattle/Tacoma Intl
Tue 9/12
11:59 p.m.-9:42 p.m.
2 stops18h 43m
C$ 417
MontrealSeattle
YUL - SEA
YULSEA
Montreal Pierre Elliott Trudeau Intl
Thu 11/12
6:00 a.m.-11:15 p.m.
2 stops20h 15m
Seattle/Tacoma Intl
Mon 15/12
5:11 p.m.-2:00 p.m.
2 stops17h 49m
C$ 417
MontrealSeattle
YUL - SEA
YULSEA
Montreal Pierre Elliott Trudeau Intl
Fri 12/12
6:00 a.m.-11:15 p.m.
2 stops20h 15m
Seattle/Tacoma Intl
Mon 15/12
3:25 p.m.-2:00 p.m.
2 stops19h 35m
C$ 417
MontrealSeattle
YUL - SEA
YULSEA
Montreal Pierre Elliott Trudeau Intl
Fri 12/12
6:00 a.m.-11:15 p.m.
2 stops20h 15m
Seattle/Tacoma Intl
Tue 16/12
5:00 a.m.-9:42 p.m.
2 stops13h 42m
C$ 417
MontrealSeattle
YUL - SEA
YULSEA
Montreal Pierre Elliott Trudeau Intl
Fri 16/1
9:00 a.m.-2:31 p.m.
1 stop8h 31m
Seattle/Tacoma Intl
Sun 18/1
5:50 a.m.-7:14 p.m.
2 stops10h 24m
C$ 492
MontrealSeattle
YUL - SEA
YULSEA
Montreal Pierre Elliott Trudeau Intl
Fri 16/1
7:30 p.m.-2:38 p.m.
1 stop22h 08m
C$ 217
MontrealSeattle
YUL - SEA
YULSEA
Montreal Pierre Elliott Trudeau Intl
Wed 14/1
7:30 p.m.-2:20 p.m.
1 stop21h 50m
C$ 233
Flights are sorted by cheapest round-trip flights first.
Deals found on 15/11
Showing 1-10 of 16 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 14 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$ 703). 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 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 17 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.
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
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
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
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
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 8h 47m. 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$ 285, 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$ 1,325, our data shows the cheapest flight currently is C$ 1,059. When looking at the most popular route, (Montreal Pierre Elliott Trudeau Intl - Seattle/Tacoma Intl), you can expect to pay C$ 405 for that flight.
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$ 703). 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.
Browse through other flights departing from Montreal. Flights are based on user searches made on Cheapflights and were last updated on 17 November 2025.
Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 17 November 2025.
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 November 2025.
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.
We value your privacy
Cheapflights and its partners wish to use cookies or similar technologies to store and/or access information on and about your device and process personal data such as your IP address, device identifiers etc., in order to improve your experience on the site, to analyze navigation, to offer and measure personalized advertising, and to facilitate sharing on social networks. We also allow the use of third-party cookies (including those from our advertising partners) on our sites.
By clicking 'Accept', you consent to your data being processed by 0 vendors on this web site for the purposes described in this notice. You can review the vendors and their individual processing purposes on the .
To review individual processing purposes and cookie categories, please click ’Select individual purposes’. You can review and update your choices anytime by clicking the ’Privacy Preferences’ link in the page side navigation.