YUL - SEA

$173 Find Cheap Flights from Montreal to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Montreal to Seattle departing on 9/12. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Montreal to Seattle, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Montreal to Seattle, as well as popular online travel agencies
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Flights Deals
Expert advice
Useful Info
Flights Deals

Cheap Flights from Montreal to Seattle (YUL-SEA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Montreal to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Montreal to Seattle

Fri, Sep 12 - Wed, Sep 17
WestJet Logo
7:00 am - 12:59 pmYUL-SEA
8h 59m1 stop
WestJet Logo
1:50 pm - 12:41 amSEA-YUL
7h 51m1 stop
$308WestJet
Find Deal
Fri, Sep 12 - Wed, Sep 17
WestJet Logo
5:30 pm - 8:29 pmYUL-SEA
29h 59m1 stop
WestJet Logo
1:50 pm - 12:41 amSEA-YUL
7h 51m1 stop
$334WestJet
Find Deal
Fri, Sep 12 - Wed, Sep 17
Air Canada Logo
4:45 pm - 7:31 pmYUL-SEA
5h 46mnonstop
Air Canada Logo
7:15 am - 3:28 pmSEA-YUL
5h 13mnonstop
$358Air Canada
Find Deal
Tue, Sep 9 - Fri, Sep 12
United Airlines Logo
6:00 am - 3:52 pmYUL-SEA
12h 52m2 stops
United Airlines Logo
7:34 pm - 10:40 amSEA-YUL
12h 06m2 stops
$364United Airlines
Find Deal
Tue, Sep 9 - Fri, Sep 12
Air Canada Logo
6:00 am - 10:59 amYUL-SEA
7h 59m1 stop
Air Canada Logo
7:15 am - 3:28 pmSEA-YUL
5h 13mnonstop
$365Air Canada
Find Deal
Mon, Aug 25 - Thu, Sep 4
United Airlines Logo
2:20 pm - 8:42 pmYUL-SEA
9h 22m1 stop
United Airlines Logo
5:07 am - 10:06 pmSEA-YUL
13h 59m2 stops
$380United Airlines
Find Deal
Sat, Aug 23 - Mon, Sep 1
American Airlines Logo
5:29 pm - 9:19 amYUL-SEA
18h 50m1 stop
American Airlines Logo
12:45 am - 4:41 pmSEA-YUL
12h 56m1 stop
$382American Airlines
Find Deal
Sun, Jul 27 - Mon, Aug 4
American Airlines Logo
7:47 am - 10:55 pmYUL-SEA
18h 08m2 stops
American Airlines Logo
11:32 pm - 10:44 pmSEA-YUL
20h 12m2 stops
$396American Airlines
Find Deal
Tue, Jul 22 - Tue, Jul 29
 Logo
3:10 pm - 4:25 pmYUL-SEA
28h 15m2 stops
 Logo
5:30 pm - 12:37 amSEA-YUL
28h 07m3 stops
Wed, Jul 9 - Wed, Jul 16
 Logo
3:10 pm - 4:25 pmYUL-SEA
28h 15m2 stops
 Logo
5:30 pm - 12:37 amSEA-YUL
28h 07m3 stops
Expert advice

Expert advice for your flight from Montreal to Seattle

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
United Airlines

United's Economy Plus offers up to six inches more legroom than standard economy seats.


United's Priority Boarding places you in Zone 2, avoiding overhead bin space issues.

Air Canada

Air Canada's Preferred Economy seats offer up to four extra inches of legroom.


Air Canada's Wi-Fi offers free messaging for Aeroplan members; full internet costs extra.

Read more about Air Canadaby Stefanie Waldek
Airports
YUL

At YUL, complete US customs pre-clearance before departure. Arrive early to allow extra time for this process.

Read more about YULby Brandon Schultz
SEA

Use the Link light rail for a cost-effective, 40-minute trip from SEA to downtown Seattle.

Read more about SEAby Harriet Baskas
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on United Airlines and Air Canada

Stefanie Waldek

Stefanie Waldek

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Read more
Brandon Schultz

Brandon Schultz

Expert on YUL

Brandon Schultz

Brandon Schultz

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more
Harriet Baskas

Harriet Baskas

Expert on SEA

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Useful Info

KAYAK's insights & trends for Montreal to Seattle flights

Get data-powered insights and trends into flights from Montreal to Seattle to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Montreal to Seattle?

The average price of all round-trip flights from Montreal Pierre Elliott Trudeau Intl Airport to Seattle clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from Montreal to Seattle, look for departures on Mondays and avoid leaving on a Sunday, as it's usually the priciest day. When flying back from Seattle, Thursday is the cheapest day to fly and Wednesday is the most expensive.

What is the cheapest month to fly from Montreal Pierre Elliott Trudeau Intl Airport to Seattle?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Montreal Pierre Elliott Trudeau Intl Airport to Seattle, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Montreal Pierre Elliott Trudeau Intl Airport to Seattle is October, where tickets cost $461 (return) on average. On the other hand, the most expensive months are December and February, where the average cost of round-trip tickets is $645 and $535 respectively.

Can I save money by flying with a layover from Montreal Pierre Elliott Trudeau Intl Airport to Seattle?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $1,256, prices are generally cheapest when you fly direct.

How far in advance should I book a flight from Montreal Pierre Elliott Trudeau Intl Airport to Seattle?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Montreal Pierre Elliott Trudeau Intl Airport to Seattle, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Montreal Pierre Elliott Trudeau Intl Airport to Seattle, you should book around 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 17 weeks before departure.

Good to know

Low seasonNovember
High seasonAugust
Cheapest flight$173
Best time to beat the crowds with an average 3% drop in price.
Most popular time to fly and prices are also 7% lower on average.
Flight from Montreal to Seattle

When to book flights from Montreal to Seattle

Are your dates flexible? Find out the best times to travel from Montreal to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Montreal to Seattle flights

  • What is the cheapest flight from Montreal Pierre Elliott Trudeau Intl Airport to Seattle?

    In the last 3 days, the lowest price for a flight from Montreal Pierre Elliott Trudeau Intl Airport to Seattle was $173 for a one-way ticket and $308 for a round-trip.

  • Do I need a passport to fly between Montreal and Seattle?

    A passport is required to fly from Montreal to Seattle.

  • Which airlines offer Wi-Fi service onboard planes from Montreal to Seattle?

    Only Air Canada offers inflight Wi-Fi service on the Montreal to Seattle flight route.

  • Which aircraft models fly most regularly from Montreal to Seattle?

    The Airbus A220-300 is the aircraft model that flies most regularly on the Montreal to Seattle flight route.

  • Which airline alliances offer flights from Montreal to Seattle?

    Star Alliance is the only airline alliance operating flights between Montreal and Seattle.

  • On which days can I fly direct from Montreal to Seattle?

    There are nonstop flights from Montreal to Seattle on a daily basis.

  • Which is the best airline for flights from Montreal to Seattle, WestJet or Air Canada?

    The two airlines most popular with KAYAK users for flights from Montreal to Seattle are WestJet and Air Canada. With an average price for the route of $443 and an overall rating of 7.2, WestJet is the most popular choice. Air Canada is also a great choice for the route, with an average price of $514 and an overall rating of 7.1.

  • How does KAYAK find such low prices on flights from Montreal to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Montreal to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Montreal to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Montreal is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Montreal to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Montreal with another airline. Booking your flights between Montreal and SEA can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Montreal to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Montreal up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Montreal Pierre Elliott Trudeau Intl Airport to Seattle

  • Looking for a cheap flight? 25% of our users found flights on this route for $227 or less one-way and $337 or less round-trip.

Prefer to fly direct from Montreal to Seattle?

Find which airlines fly direct from Montreal Pierre Elliott Trudeau Intl Airport to Seattle/Tacoma Intl Airport, which days they fly and book direct flights.

Direct departures

Montreal Pierre Elliott Trudeau Intl to Seattle/Tacoma Intl

Monday

Air Canada, United Airlines

Air Canada, United Airlines

Tuesday

Air Canada, United Airlines

Air Canada, United Airlines

Wednesday

Air Canada, United Airlines

Air Canada, United Airlines

Thursday

Air Canada, United Airlines

Air Canada, United Airlines

Friday

Air Canada, United Airlines

Air Canada, United Airlines

Saturday

Air Canada, United Airlines

Air Canada, United Airlines

Sunday

Air Canada, United Airlines

Air Canada, United Airlines

See more direct flights

Direct returns

Seattle/Tacoma Intl to Montreal Pierre Elliott Trudeau Intl

Monday

Air Canada, United Airlines

Air Canada, United Airlines

Tuesday

Air Canada, United Airlines

Air Canada, United Airlines

Wednesday

Air Canada, United Airlines

Air Canada, United Airlines

Thursday

Air Canada, United Airlines

Air Canada, United Airlines

Friday

Air Canada, United Airlines

Air Canada, United Airlines

Saturday

Air Canada, United Airlines

Air Canada, United Airlines

Sunday

Air Canada, United Airlines

Air Canada, United Airlines

See more direct flights
See more direct flights

Top airlines flying from Montreal to Seattle

 
See real verified KAYAK customer reviews for airlines flying from Montreal to Seattle. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Montreal to Seattle? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.2
WestJetOverall score based on 2868 reviews
7.9Crew
6.2Food
7.1Comfort
6.1Entertainment
7.4Boarding
Airline reviews

Late departure, so I missed connection in Detroit. But Delta gave me a great hotel & breakfast. Just sorry I could not get anything from my checked baggage.

8.0 ExcellentAnonymous, May 2025YVR - DTW
Read more WestJet reviews

Late departure, so I missed connection in Detroit. But Delta gave me a great hotel & breakfast. Just sorry I could not get anything from my checked baggage.

Crew was friendly. Lost our luggage and told us it’d be in later in the evening of the day we returned. It was not. Still after 5 days have not received it.

Internet on both flights was sketchy. Thus in flight entertainment was non- existent on MN - Balrimote leg.

It took 30 minutes to check in with the Westjet rep. They didn’t have enough seats and she needed to make a call… I am always “randomly” selected to be checked at security. Their “randomly “ selection system may need some updating. They treat people like criminals. It is not appropriate behavior.

Will never book through you again. Very disappointed in the notices and action taken or provided when planes are rescheduled, enough to cause missed connections

Lost my luggage. Filed a report and there is no response. Received a phone call from another airline that said they had the bag and they did not know what to do with it

Very good over all , would have been nice to have entertainment on the flight

Absolutely the worst airline I have ever taken. They lost my baggage and told me my bag tags had been cancelled. When my bags arrived days later I had to pick them up at 3:15 am. My return flight was delayed another 6 hours and they broke my bag. Westjet does nothing to try and make it a better customer experience and all the customers services representatives I spoke with were useless and incompetent. Never flying westjet again.

it's all good nothing you can do make better 😌

Very old planes. Seats were not comfortable. Air was not on during the flight leading to incredibly stuffy conditions.

Received email saying that there won’t be a seat back entertainment screen and inflight WiFi would be available. But no WiFi both ways. Say it in the email.

Good, only discomfort was consistent turbulence through the 3 hour flight. Not sure if in companies control though.

Terrible. Flight was delayed for hours and we ended up arriving at our home at 4am after 20+ hours flying.

Flight was cancelled around 45 -1hr minutes before scheduled take off time due to mechanical issues we hadn’t even boarded yet. Had to reroute to Orlando so someone had to drive 2 1/2 to come and get me… the alternative was go through Toronto and get a later flight which didn’t work for my schedule. The flight attendants barely gave anyone a smile…not the same as flying when a client/passenger was important. Very disappointed. By the way I have never ever made a complaint online about any company with feedback…even when I probably should have. The only good experience was the boarding desk associates who were very professional and got me on another flight with my checked bags…very nice team.

Actually as my experience with air Canada from Canada to Newark it was crazy for me because it was a lot of delays which for me it shouldn’t be like that, but I was able to coup with it so that was my experience I hope next time they will do good on that thanks.

Boarding was challenging as we had to use the stairs from the tarmac. Stairs are okay but a roller bag makes it challenging.

Mixed experienced. Nice staff. Spacious 787 better than cramped Airbus, though my seat was broken. The bad: Way overpriced ticket and charged for food despite 6 hr flight.

Very smooth flight and the crew members were very welcoming.

My one complaint was that while we boarded using the standard enclosed gangway, when we arrived at SEATAC, the ground crew were slow to hook up the stairs. After reaching the tarmac we had to walk up a long ramp all outside in 35° weather. We just came from Bali and did not have warm weather clothes. This was in addition to having to collect our bags in Vancouver, take them through security again and then having to show our passports 4 more times all within the Air Canada section.

Super. Planes were clean. Flights were on time. boarding was smooth. Flight attendants were professional.

Everything you need to know for your flight from Montreal to Seattle

Information on your arrival and departure airports

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