YUL - SEA

$188 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 6/9. 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, 0 bags

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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$305
Typical prices: $537-$400
WestJet
Tue 6/2Sat 6/6
YUL - SEA • 2 stops
Cheapest one-way
$188
Typical prices: $253-$363
WestJet
Tue 6/9
YUL - SEA • 2 stops
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
United's Economy Plus offers six extra inches of legroom.
Complete US customs pre-clearance at YUL before departure.
Expert advice
Expert advice
Expert advice
Expert advice
Top layover airports
Cheapest • Avg $615 (round-trip)
Shortest trip • 8h 34m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 32% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 12% price drop
Most popular
Good to know
Good to know
+1
+1
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Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Seattle!
Flight Deals
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Expert advice
Flight 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

Tue, Jun 2 - Sat, Jun 6
WestJet Logo
6:45 am - 6:45 pm
YUL
-
SEA
15h 00m
2 stops
WestJet Logo
7:35 pm - 7:05 am
SEA
-
YUL
8h 30m
1 stop
$305WestJet
Wed, Jun 10 - Fri, Jun 12
WestJet Logo
6:45 am - 6:45 pm
YUL
-
SEA
15h 00m
2 stops
WestJet Logo
7:35 pm - 7:05 am
SEA
-
YUL
8h 30m
1 stop
$307WestJet
Wed, Jun 17 - Mon, Jun 22
WestJet Logo
6:45 am - 6:45 pm
YUL
-
SEA
15h 00m
2 stops
WestJet Logo
7:35 pm - 7:05 am
SEA
-
YUL
8h 30m
1 stop
$308WestJet
Wed, Jun 17 - Sun, Jun 21
WestJet Logo
6:45 am - 6:45 pm
YUL
-
SEA
15h 00m
2 stops
WestJet Logo
10:30 am - 12:25 am
SEA
-
YUL
10h 55m
2 stops
$311WestJet
Thu, Jun 18 - Tue, Jun 23
WestJet Logo
6:45 am - 6:45 pm
YUL
-
SEA
15h 00m
2 stops
WestJet Logo
10:30 am - 12:25 am
SEA
-
YUL
10h 55m
2 stops
$313WestJet
Fri, Jun 5 - Sat, Jun 13
WestJet Logo
6:45 am - 6:45 pm
YUL
-
SEA
15h 00m
2 stops
WestJet Logo
7:35 pm - 7:05 am
SEA
-
YUL
8h 30m
1 stop
$314WestJet
Thu, Jun 18 - Sun, Jun 21
WestJet Logo
6:45 am - 6:45 pm
YUL
-
SEA
15h 00m
2 stops
WestJet Logo
10:30 am - 12:25 am
SEA
-
YUL
10h 55m
2 stops
$323WestJet
Wed, Jun 10 - Fri, Jun 12
WestJet Logo
6:45 am - 6:45 pm
YUL
-
SEA
15h 00m
2 stops
WestJet Logo
10:30 am - 12:25 am
SEA
-
YUL
10h 55m
2 stops
$324WestJet
Mon, May 4 - Mon, May 11
WestJet Logo
8:00 pm - 9:40 am
YUL
-
SEA
16h 40m
1 stop
WestJet Logo
7:35 pm - 7:05 am
SEA
-
YUL
8h 30m
1 stop
$329WestJet
Wed, Apr 29 - Thu, Apr 30
WestJet Logo
7:15 am - 6:45 pm
YUL
-
SEA
14h 30m
1 stop
WestJet Logo
7:35 pm - 7:05 am
SEA
-
YUL
8h 30m
1 stop
$332WestJet
Booking Insights

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.

How much is a round-trip flight from Montreal Pierre Elliott Trudeau Intl Airport to Seattle?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Montreal Pierre Elliott Trudeau Intl Airport to Seattle departing in June.

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 Wednesday, as it's usually the priciest day. When flying back from Seattle, Monday is the cheapest day to fly and Friday 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 February, where tickets cost $417 (return) on average. On the other hand, the most expensive months are December and March, where the average cost of round-trip tickets is $538 and $528 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.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $523 on average.

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, which saves you about 32% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 13 weeks before departure.

Expert advice

Expert advice for your flight from Montreal to Seattle

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on United Airlines and Air Canada

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.

Brandon Schultz

Brandon Schultz

Expert on YUL

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.

Harriet Baskas

Harriet Baskas

Expert on SEA

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.

Good to know

Low seasonFebruary
Cheapest flight$188
Best time to beat the crowds with an average 13% drop in price.
Most popular time to fly and prices are also 4% 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 $188 for a one-way ticket and $305 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 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.

  • 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 $397 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 $489 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.

Reviews of the 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 3316 reviews
6.1Entertainment
7.4Boarding
7.0Comfort
6.2Food
7.9Crew
Airline reviews

The agents at the Kelowna YLW airport were really grumpy. Same with oversized baggage person. Staff on the plane were great.

10.0 ExcellentAnonymous, Mar 2026
YLW - SEA
Read more WestJet reviews

The agents at the Kelowna YLW airport were really grumpy. Same with oversized baggage person. Staff on the plane were great.

Flight was early. That’s the only positive I can share. I paid for wifi on the flight and it didn’t allow me to use any streaming services so it was a waste of $20. West Jet also lost my ski equipment on my way to a ski vacation. They told me it would be delivered to the hotel as soon as it arrived at the airport. It was never delivered. I had to pick it up at the airport on my way home. I am completely disgusted with my experience on west jet

The window seat on the emergency row was too small. I had a different seat booked and they moved me. My seat remained open. It was very uncomfortable.

Experience was good, the wifi hook up is somewhat tough

Great flight, great landing, nice staff. Our seats were a little cramped.

I will not be flying with westjet again. I was uncomfortable in my seat. The position made my back hurt so bad. My wife was able to fit the seatbelt around her with out an extension but was unable to put the tray table down or fit in the seat for that matter. Our bag was smashed and I spent two hours trying to fill out the application for a damaged bag before I gave up. The 80 photos I took would not work and nothing telling me the format to upload them as.. I made the mistake of unpacking the bag before taking photos so no claim for me. Next trip to Canada I will have to use air Canada.

Overall good experience. The wait for baggage at our destination was quite long, but other than that everything was good as expected

They lost my bag. Hopefully it will be here tomorrow.

Airplane is too small. Crew, especially the flight attendant who looked after our area, was not at all friendly and a touch authoratative. She may have been the most gruff flight attendant i've come across in 40 years of business travel

I selected "carry-on" for a round trip on Kayak, but my return flight on WestJet did not include a carry-on and they would not allow me to add one. My only option was to add a "checked bag" which I had to wait for on the luggage carousel after landing. Not a good experience.

After 3 hours of delays, they ended up cancelling my flight. And although I could purchase one-way tickets to get to my destination, they would not offer me these flights as compensation for the cancelled flight, and I didn't end up making it home until 13 hours after I was originally supposed to arrive. It made for an extremely strenuous end to an otherwise good trip.

Be careful about the bad policy and when purchasing seats

Very disappointed with premier lounge. Food selection very poor, both coffee machines out of order. For the price you charge for an upgrade, the seats don’t fully recline, movie selection is old. Not very good value. Asian airlines are light years ahead at a more affordable price.

Got denied my flight was told on Google that Air Canada was supposed to book me a flight back home because I never was able to go to my destination. They did not help me whatsoever. I had to book a whole new flight for that reason I would write this is zero

We left over 2 hours late and they didn't even give us a complimentary snack, when getting to the desk I asked if I could be put in a row with only 1 other person or an empt y one I was told the flight was full when the last two rows were empty. All around over it

Air Canada’s problems are not staff related by and large, no. The problem is tiny jets between the U.S. and Canada - yes, believe it or not they are still “international” (just ask our own Mango Maniac in power in the U.S.). The little aisle is compounded by a design flaw of a “dog leg” starting at seat 12. Woe be unto you if you sit here as passengers and attendants do not have sufficient room to not hit you in the face with backpacks. One thing I will say very positively about Air Canada is you still provide pillows and blankets on transcontinental flights to all, not just the elites. Your tiny improperly designed jets are also a problem flying city to city within Canada also. One can only say you remind us of a “Jet Blue” or “Spirit” experience. Also your luggage space is downright Byzantine! We will endeavor to avoid you and use other U.S. carriers, albeit charging more.

Terrible canceled flight and lost my luggage. Flew me to Halifax. Tgat flight was delayed, had to spend night in airport chair.

My seat was not comfortable. Flight was smooth. Regretfully we had two delays before takeoff

They are very proactive and made our boarding easy and always notified us about any changes well in advance.

The staff could not have been any friendlier. Lots of usb ports on our aircraft.

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

Information on your arrival and departure airports