SEA - YUL

$125 Find Cheap Flights from Seattle to Montreal

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Montreal departing on 6/5. 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 Montreal Pierre Elliott Trudeau Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Montreal, 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 Seattle to Montreal, as well as popular online travel agencies
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41 299 237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$313
Overall average: $682
WestJet
Mon 3/2Mon 3/9
SEA - YUL • 1 stop
Cheapest non-stop
$504
Air Canada
Fri 7/17Sun 7/19
SEA - YUL • Non-stop
Our travelers' advice
AI-powered summary based on content written by travel experts. AI can make mistakes.
United's Economy Plus offers six extra inches of legroom.
Use SEA Spot Saver for faster security at Seattle.
Expert advice
Expert advice
Expert advice
Expert advice
Video guide: How to find cheap flights to Montreal
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Top airlines
WestJet
Cheapest • from $313 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
6 weeks
in advance
Our data shows that travelers who book at least 6 weeks in advance save around 45% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
May
Cheapest • 42% price drop
May
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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Flight Deals
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Expert advice
Flight Deals

Cheap Flights from Seattle to Montreal (SEA-YUL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Montreal 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 Seattle to Montreal

Mon, Mar 2 - Mon, Mar 9
WestJet Logo
3:10 pm - 7:05 am
SEA
-
YUL
12h 55m
1 stop
WestJet Logo
7:30 pm - 2:19 pm
YUL
-
SEA
21h 49m
1 stop
$313WestJet
Tue, Apr 28 - Sun, May 3
WestJet Logo
7:35 pm - 7:05 am
SEA
-
YUL
8h 30m
1 stop
WestJet Logo
8:00 pm - 9:40 am
YUL
-
SEA
16h 40m
1 stop
$314WestJet
Mon, Mar 16 - Mon, Mar 23
WestJet Logo
3:10 pm - 12:38 am
SEA
-
YUL
30h 28m
2 stops
WestJet Logo
7:30 pm - 2:19 pm
YUL
-
SEA
21h 49m
1 stop
$317WestJet
Fri, May 29 - Mon, Jun 1
WestJet Logo
7:35 pm - 7:05 am
SEA
-
YUL
8h 30m
1 stop
WestJet Logo
7:20 pm - 6:45 pm
YUL
-
SEA
26h 25m
2 stops
$320WestJet
Fri, May 29 - Mon, Jun 1
WestJet Logo
7:35 pm - 6:20 pm
SEA
-
YUL
19h 45m
2 stops
WestJet Logo
7:20 pm - 6:45 pm
YUL
-
SEA
26h 25m
2 stops
$323WestJet
Wed, Mar 4 - Mon, Mar 9
WestJet Logo
3:10 pm - 7:05 am
SEA
-
YUL
12h 55m
1 stop
WestJet Logo
7:30 pm - 2:19 pm
YUL
-
SEA
21h 49m
1 stop
$325WestJet
Fri, May 29 - Mon, Jun 1
WestJet Logo
7:35 pm - 7:00 am
SEA
-
YUL
8h 25m
1 stop
WestJet Logo
8:00 pm - 9:40 am
YUL
-
SEA
16h 40m
1 stop
$326WestJet
Fri, May 29 - Mon, Jun 1
WestJet Logo
7:35 pm - 7:05 am
SEA
-
YUL
8h 30m
1 stop
WestJet Logo
8:00 pm - 9:40 am
YUL
-
SEA
16h 40m
1 stop
$327WestJet
Mon, Mar 16 - Mon, Mar 23
WestJet Logo
3:10 pm - 7:05 am
SEA
-
YUL
12h 55m
1 stop
WestJet Logo
7:30 pm - 2:19 pm
YUL
-
SEA
21h 49m
1 stop
$328WestJet
Tue, May 5 - Tue, May 12
WestJet Logo
7:35 pm - 7:00 am
SEA
-
YUL
8h 25m
1 stop
WestJet Logo
7:15 am - 6:45 pm
YUL
-
SEA
14h 30m
1 stop
$339WestJet
Booking Insights

KAYAK's insights & trends for Seattle to Montreal flights

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

Find cheap flights to Montreal
Find cheap flights to Montreal

Planning a trip from Seattle to Montreal? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.

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

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

Your flight ticket price will generally be cheaper if you fly to Montreal on a Monday and more expensive on a Friday. On your return trip to Seattle, you should consider flying back on a Monday, and avoid Tuesdays for better deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to Montreal Pierre Elliott Trudeau Intl Airport, 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 Seattle to Montreal Pierre Elliott Trudeau Intl Airport is May, where tickets cost $370 (return) on average. On the other hand, the most expensive months are January and December, where the average cost of round-trip tickets is $1,002 and $833 respectively.

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

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 2 stops layover the cheapest option at $593 on average.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle to Montreal Pierre Elliott Trudeau Intl Airport, 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 Seattle to Montreal Pierre Elliott Trudeau Intl Airport, you should book around 6 weeks before departure, which saves you about 45% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 24 weeks before departure.

Expert advice

Expert advice for your flight from Seattle to Montreal

 
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 Air Canada and United Airlines

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 seasonJanuary
Cheapest flight$125
Best time to beat the crowds but there is an average 56% increase in price.
Most popular time to fly and prices are also 43% lower on average.
Flight from Seattle to Montreal

When to book flights from Seattle to Montreal

Are your dates flexible? Find out the best times to travel from Seattle to Montreal 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 Seattle to Montreal flights

  • What are some layover cities for flights from Seattle to Montreal?

    Several flights from SEA to YUL have layovers en route. Some of the common layover cities include Calgary (YYC) by WestJet and Flair, Washington, D.C. (IAD) by United, Vancouver (YVR) by Air Canada, San Francisco (SFO) by United, Toronto (YYZ) by Air Canada, Los Angeles (LAX) by United, Atlanta (ATL) by Delta, Chicago (ORD) BY United, Minneapolis (MSP) by Delta, and Dallas (DFW) by American.

  • What are the transport options from Montreal Airport to downtown?

    STM 747 Express 747 Bus connects YUL Airport to downtown Montreal and operates a 17-mins interval. Orleans Express Service Aeroport Trudeau Bus connects YUL Airport to downtown Montreal and runs four times daily. Societe de Transport de Montreal 354 Bus connects YUL Airport to downtown Montreal and operates five times daily. Taxis are available on demand on YUL Airport transport ground and link YUL Airport with downtown Montreal.

  • Which airlines offer accessible services from Seattle to Montreal?

    Air Canada can accommodate people with special needs flying from SEA to YUL. They offer accessible services such as booking assistance, wheelchair assistance during boarding, navigation, and disembarking for those with reduced mobility, and priority checking. The airline provides alternative access to information for passengers who are hard of hearing and have low vision, such as closed captioning, braille, and audio descriptions.

  • Can a minor fly unaccompanied from Seattle to Montreal?

    Your minor can travel alone from SEA to YUL unaccompanied at a fee with United Airlines. The airline allows children aged 5 to 14 but restricts connecting flight travels to those aged eight and above. You must accompany your minor for check-in at least 2 hours before departure. You must also provide documents such as the minor’s passport and birth certificate to verify age. You must provide additional documents and information such as your photo ID, contact number, and details of the receiving adult, including name, address, and contact telephone number.

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

    In the last 3 days, the lowest price for a flight from Seattle to Montreal Pierre Elliott Trudeau Intl Airport was $129 for a one-way ticket and $313 for a round-trip.

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

    Yes

  • Which airports will I be using when flying from Seattle to Montreal?

    Seattle and Montreal are both served by 1 main airport. You will leave Seattle from Seattle/Tacoma Intl and will be arriving at Montreal Pierre Elliott Trudeau Intl.

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

    Air France, United Airlines, Air Canada, and Lufthansa offer inflight Wi-Fi service on the Seattle to Montreal flight route.

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

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

  • Which airline alliances offer flights from Seattle to Montreal?

    SkyTeam, and Star Alliance are the airline alliances operating flights between Seattle and Montreal, with SkyTeam being the most commonly used for this route.

  • Which is the best airline for flights from Seattle to Montreal, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from Seattle to Montreal are Delta and United Airlines. With an average price for the route of $786 and an overall rating of 7.9, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $594 and an overall rating of 7.4.

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

    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 Seattle to Montreal.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Montreal from Seattle 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 Seattle to Montreal?

    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 Montreal with an airline and back to Seattle with another airline. Booking your flights between Seattle and YUL 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 Seattle to Montreal?

    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 Montreal from Seattle 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 Seattle to Montreal Pierre Elliott Trudeau Intl Airport

  • Looking for a cheap flight? 25% of our users found flights on this route for $257 or less one-way and $644 or less round-trip.
  • You can access unique meals personalized to meet your dietary preferences from Seattle–Tacoma Airport - Seatac (SEA) to Montreal International Airport (YUL) with American. They include child-friendly, vegetarian, gluten- and lactose-free, vegan, and diabetic.
  • Delta Airlines allows you to board with a carry-on bag and a personal item at no additional cost from SEA to YUL. The maximum dimension the airline allows is 17 x 13 x 9 inches for your personal item and 22 x 14 x 9 inches for your carry-on bag.
  • For a fee, you can travel alongside your pet from SEA to YUL with American Airlines. You must enclose your pet in a collapsible soft-sided kennel with maximum dimensions of 18 x 11 x 11 inches. The kennel must be small but comfortable. The combined weight limit for your pet and its carrier must be 20 lb.
  • Consider flying Business- or First-class from SEA to YUL with United Airlines. They offer premium amenities and services for these passengers, including access to their United Club Lounge on the Mezzanine Level at the Concourse of the Airside at SEA Airport and comfortable lie-flat seats.
  • Traveling from SEA to YUL alongside your young one with Delta Air Lines is convenient. It offers family-friendly services such as in-flight kid’s entertainment, priority check-in, and boarding for those with young children.

Reviews of the top 4 airlines serving from Seattle to Montreal

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Montreal. 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 Seattle to Montreal? 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.
7.9
DeltaOverall score based on 8180 reviews
7.8Entertainment
7.2Food
7.9Comfort
8.1Boarding
8.5Crew
Airline reviews

Was forced to check in my small carry on, even though I informed the crew it has very fragile items inside

2.0 MediocreJaspreet, Feb 2026
SEA - SMF
Read more Delta reviews

Was forced to check in my small carry on, even though I informed the crew it has very fragile items inside

This was one of the worst flights I’ve been on in years. I upgraded to comfort and had such an uncomfortable experience. The person next to me was oversized - which I understand - however, they took up their space and mine. I could only use about 50% of my seat space to not be physically touching this person the entire flight and there was no spatial awareness. I also could not use the seat outlet because their body was obstructing it. It was very inconvenient. Their body kept touching me repeatedly during the flight and I felt very uncomfortable. To pay more for an upgraded space and then not even being able to use it was highly disappointing.

No wheel chair as requested at Atlanta arrival on first flight.

Only freetext wifi was available in flight; browsing WiFi required payment. Since the seats had no in flight entertainment, Delta should revisit this policy on this longer flight.

Only water, tea or coffee served midflight, even to comfort seating. Man next to me needed two seats and took up a portion of my seat and Delta did nothing.

The flight was great as well as the airline staff

First class and monitors weren’t working for mine & my husbands. Eventually fixed, but quite annoyed as we bought first class. Also, No foot rests.

Prior to takeoff, the pilot told us there was a possibility of not being able to land and going to Portland. Well that happened, we took off and then did 8 loops around Spokane before the pilot told us we ran out of fuel and had to go to Portland. So for a 35 minute flight we have now been on the plane for 3 hours (boarded at 6:50 am and landed in Portland at 10:30). Then, we just sat in Portland's airport with no updates of when we can start heading back. All of a sudden, our pilots and crew just left, leaving us stranded in a different city and state. We continued to sit in Portland until we finally got a new crew assigned and boarded the plane (This was from 10:30-2). We then sat on the plane for an additional hour before take off because they had to count us multiple times. We finally landed in Spokane at 3:55 PM. So a flight that should have taken at max an hour took us 10 hours and we missed the majority of the recruiting event we went for.

It was delayed but other than that it was great.

Got on the plane and sat there for an hour before departure.

Wifi took a while to kick in and we had a maintenance issue that took over 40 mins at the gate in Washington before pulling back

Not United Airlines' fault. It's ORL airport's fault.

United overall experience is great these days. Airport experience was very organized. Staff on flight were great. App and information as good as it gets.

Very nice flight love the small aircraft. We had a wonderful flight attendant. Nice to see someone that really enjoys her job. Don't have her name but had a southern accent.

Seats in waiting area and on plane hard as rock. Fast internet on the flight was great! Crew was kind.

United needs to step up their game. Delayed flight leaving Seattle, San Francisco. Older aircraft, not very comfortable.

Not the fault of United—weather, reroute around weather, time sitting on tarmac, arrived couple hours late, too late for train into city necessitating a much pricier cab but weather…can’t be helped.

Flight was good but there are way to many announcements for credit cards etc.

I had no checked baggage but was required to hand over carry on baggage at the door of the plane. There was a lot of overboard space in the plane and I was one of the last ones. I ran to get my carry on but it was gone. I was given back at the plane door in Toronto, so the wait was not as long as it would have been at the carousel.

We had a layover from YVR to Denver. We bought 4 bottles of Absolut Vodka at the YVR Duty Free for $116.20, after going through security and American Customs Pre Clearance at YVR, Vancouver. When we landed in Denver, United put us behind the American Customs as well as TSA again for some reason. We were forced to go through American Customs and TSA again. TSA confiscated our rightfully owned Duty Free Absolut Vodka bottles. Because United incorrectly forced our flight behind American border and TSA again, we missed the connecting flight. After United put us on a later flight, we eventually arrived in Chicago very late, with hardly any sleep. I am looking for compensation from United for our incorrectly confiscated Absolut Vodka bottles worth $116.20, as well as compensation for incorrectly putting us behind American Customs and TSA again, causing us to miss our connecting flight, making us arrive extremely late in Chicago.

Flight was good, crew was excellent. No complaints at all

Delayed 3 times in a row for 4 hours total. Incrementally pushing back the flight claiming gate delays but they eventually changed the actual plane, due to technical issues. This strategy to avoid compensation to passengers is unprofessional.

I didn't think about not having the right app for wifi because my connecting flight was with Westjet and when I took off from Seattle I was thinking I would use my wifi, but realized I couldn't on my Westjet app and I did not have Delta's app downloaded.

Plane seating was uncomfortable, very tight fitting for someone my height, did not recline and overall un enjoyable

Everything was good except for flight delay, but it was because of the snow storm in the arrival airport.

No communication from Kayak or West Jet. Booked extra flights, flights cancelled, no one answers calls. Will be disputing charges.

The trip from LAX to Calgary was aboard a 737-700, which is more than twenty years old. Service was fine, and the food was good, but there was no inflight entertainment, and no WiFi. The flight from Calgary to Vancouver was also delayed more than an hour, due to congestion on the Calgary tarmac. And no food service, but there was in-flight WiFi which made a big difference.

Leg room is a problem the plane was dirty and there were no movies available on the app

The personal item sizer cannot take a standard backpack, and the cabin luggage sizer cannot take a standard carry-on. Designed for people from the island of Lilliput!!. and also compels people to pay additional fees to check their bags. Making money by ticking off the passengers is a very short-sighted business strategy, especially since they have a choice of carriers

my wife got very sick and we did not travel . we booked and bought the travel insurance and dot nothing but hassle and a triangle of stress in trying to make the insurance claim I called in and was told they would not give me anything in writing to say they would not refund my money back this make it impossible to file the claim I will never book with Kayak again.

Couldn't fit knees, only 1 toilet working, didn't get anything to drink cause the stewards were not able to get to us

Our biggest complaint about Air Canada is that if you don’t like your seat during check-in, there’s a fee to move elsewhere. On our flight from YUL to FFL, we were charged to change seats—just regular seats. What’s maddening is that the plane wasn’t even full; there were even a few people sleeping in the middle row sections (entire rows, completely empty), using them as beds. In my opinion, charging passengers for seat changes is a cash grab by Air Canada. They are definitely not the airline they were back in the day. I suppose they need to gouge the consumer now that they pay their attendants while on ground. One out of 10.

Allow me to book extra bag check in as free though I packed in 1 luggage but that was 7 LBS overweight so make another bag to free check in.

Plane left an hour late, I missed my connection and my bow case was never even loaded on the plane in VA. I deal with this type of nonsense everytime I fly air canada.

It was a smooth flight both in the sky and landing!

Fare was great, seat comfort the opposite as cushion was worn out. Ok for 2 hour flight, not for 4.5 hour flight..

For the price, it was a really good experience. There was no entertainment on board, so I couldn't really rate this, and I didn't order a meal. I appreciated that there was a free glass of wine.

Very bad, flight was cancelled due to strike and staff was unable to rebook us

Air Canada is my new fave airline..I plan to use when I can. No complaints at all just rave compliments for the staff and airline.

Strike pissed me n stranded in middle of no where

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

Information on your arrival and departure airports