SEA - YUL

$179 Find Cheap Flights from Seattle to Montreal - Compare and Save

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 9/25. 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

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Everything you should know

Cheapest round-trip
$382
Typical prices: $428-$673
Air Canada
Thu 8/13Wed 8/19
SEA - YUL • 2 stops
Cheapest one-way
$179
Typical prices: $193-$322
WestJet
Fri 9/25
SEA - YUL • 1 stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
Air Canada Preferred Economy adds up to 4 extra inches of legroom.
United Economy Plus offers up to 6 more inches than standard economy.
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Cheapest • from $382 (round-trip)
Best reviews • 7.8 score
Airline reviews
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Top layover airports
Cheapest • Avg $433 (round-trip)
Shortest trip • 7h 50m (one-way)
Insights
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When to book
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 41% compared to booking last minute.
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When to travel
Cheapest • 30% price drop
Most popular
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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

Thu, Aug 13 - Wed, Aug 19
Air Canada Logo
5:50 am - 8:35 pm
SEA
-
YUL
11h 45m
2 stops
Air Canada Logo
1:30 pm - 10:42 pm
YUL
-
SEA
12h 12m
2 stops
$382Air Canada
Thu, Sep 17 - Tue, Sep 22
Multiple Airlines Logo
7:35 pm - 7:05 am
SEA
-
YUL
8h 30m
1 stop
Multiple Airlines Logo
6:00 pm - 10:42 pm
YUL
-
SEA
7h 42m
1 stop
$387Multiple Airlines
Thu, Aug 13 - Wed, Aug 19
Air Canada Logo
5:50 am - 8:35 pm
SEA
-
YUL
11h 45m
2 stops
Air Canada Logo
5:30 pm - 10:42 pm
YUL
-
SEA
8h 12m
1 stop
$391Air Canada
Thu, Sep 17 - Tue, Sep 22
Air Canada Logo
10:50 am - 11:21 pm
SEA
-
YUL
9h 31m
2 stops
Air Canada Logo
8:00 am - 2:22 pm
YUL
-
SEA
9h 22m
2 stops
$395Air Canada
Mon, Aug 10 - Tue, Aug 18
Air Canada Logo
3:00 pm - 7:10 am
SEA
-
YUL
13h 10m
2 stops
Air Canada Logo
1:30 pm - 10:42 pm
YUL
-
SEA
12h 12m
2 stops
$401Air Canada
Thu, Aug 13 - Thu, Aug 20
Air Canada Logo
5:50 am - 8:35 pm
SEA
-
YUL
11h 45m
2 stops
Air Canada Logo
8:30 am - 6:32 pm
YUL
-
SEA
13h 02m
2 stops
$404Air Canada
Thu, Sep 10 - Fri, Sep 18
WestJet Logo
7:35 pm - 7:05 am
SEA
-
YUL
8h 30m
1 stop
WestJet Logo
6:45 am - 6:45 pm
YUL
-
SEA
15h 00m
2 stops
$405WestJet
Thu, Sep 24 - Mon, Sep 28
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
$406WestJet
Wed, Aug 12 - Wed, Aug 19
Multiple Airlines Logo
7:35 pm - 7:05 am
SEA
-
YUL
8h 30m
1 stop
Multiple Airlines Logo
5:30 pm - 10:42 pm
YUL
-
SEA
8h 12m
1 stop
$407Multiple Airlines
Sat, Oct 3 - Sun, Oct 11
WestJet Logo
7:35 pm - 7:05 am
SEA
-
YUL
8h 30m
1 stop
WestJet Logo
6:45 am - 6:45 pm
YUL
-
SEA
15h 00m
2 stops
$408WestJet
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.

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

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

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 Sunday and more expensive on a Friday. On your return trip to Seattle, you should consider flying back on a Sunday, and avoid Wednesdays 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 August, where tickets cost $497 (return) on average. On the other hand, the most expensive months are January and March, 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.

No, with an average price for the route of $605, prices are generally cheapest when you fly direct.

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 3 weeks before departure, which saves you about 41% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 25 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$179
Best time to beat the crowds but there is an average 41% increase in price.
Most popular time to fly and prices are also 2% 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 5 days, the lowest price for a flight from Seattle to Montreal Pierre Elliott Trudeau Intl Airport was $179 for a one-way ticket and $382 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?

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

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

    The Boeing 787-9 Dreamliner 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 $619 and an overall rating of 7.8, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $767 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

  • 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.
7.8
DeltaOverall score based on 8453 reviews
8.1Boarding
8.5Crew
7.8Entertainment
7.2Food
7.8Comfort
Airline reviews

My flight was delayed by 4 hours in 30 minute increments. The gate agents were amazing but the communication was not. We were told that there was a maintenance issue but they didn't know what it was. That didn't inspire confidence. Then they said they found it and it was fixed and the pilot just needed to sign off. Then the pilot needed to talk to the other pilot from the arriving flight and we'd be fine. Then we were waiting for the pilot to call back. Then the maintenance issue wasn't fixed. Then they decided we were getting a new plane (why didn't they decide this earlier??). Fine. But then they announced we were changing gates AND terminals. And we were boarding in 20 minutes. So we all had to run to the new terminal gate. We could have taken off at that time, but we then had to wait for all the people who rebooked on a different flight to book this flight again. That took 30+ minutes because there was only one gate agent. When everyone ditched this flight, I saw it as an opportunity to upgrade to comfort. Delta, the greedy jerks they are, charged me $121. After their delay, their fault, their issues, couldn't even discount an upgrade. They only handed out $12 meal vouchers for the delay. I can't even get a snack from starbucks for that.

2.0 MediocreBlake, Jun 2026
SEA - BOS
Read more Delta reviews

My flight was delayed by 4 hours in 30 minute increments. The gate agents were amazing but the communication was not. We were told that there was a maintenance issue but they didn't know what it was. That didn't inspire confidence. Then they said they found it and it was fixed and the pilot just needed to sign off. Then the pilot needed to talk to the other pilot from the arriving flight and we'd be fine. Then we were waiting for the pilot to call back. Then the maintenance issue wasn't fixed. Then they decided we were getting a new plane (why didn't they decide this earlier??). Fine. But then they announced we were changing gates AND terminals. And we were boarding in 20 minutes. So we all had to run to the new terminal gate. We could have taken off at that time, but we then had to wait for all the people who rebooked on a different flight to book this flight again. That took 30+ minutes because there was only one gate agent. When everyone ditched this flight, I saw it as an opportunity to upgrade to comfort. Delta, the greedy jerks they are, charged me $121. After their delay, their fault, their issues, couldn't even discount an upgrade. They only handed out $12 meal vouchers for the delay. I can't even get a snack from starbucks for that.

Love me some Delta. One of the few airlines to recognize and support veterans. Easy boarding, flight was on time and arrived early and the flight attendants were excellent on this flight.

We sat on the runway for over an hour before departure. That was unwelcome.

The Boarding process was great. Particularly since my wife and I require assistance. The flight attendants were amazing. We travel frequently; they honestly were a cut above. 😀

Crew was nice, meal was good. Entertainment had to be rebooted 3 times and still did not work. Turns out there was residue on screen, it needed to be cleaned to prevent the touchscreen buttons from continuously activating. I had entertainment for the last 45 minutes of a 5 hour 45 minute flight. Really unacceptable for first class. Flight attendent indicated your cleaning solution creates this problem. Seems as if this is widely known, you should be using a different product or cleaning better. Really really disappointing which simply added to the wi fi on your planes with reliably never ever works.

Snacks and included beverages were appreciated. Boarding went smoothly. Plenty of overhead bin space. Seats get very uncomfortable after a couple of hours. After waiting 10 painful minutes for my walker, a very nice Delta guest agent pushed me in a wheelchair to the gate. It was finally delivered to me after another 15 minutes . Our checked bag was on the carousel long b4 I was able to retrieve it. Fortunately it was still there but somewhere along the way the straps we used to secure it were removed and and were not reattached. Wish I had made note of the agents name.

The cabin temperature was nice and cool. The wifi was not working.

Could not get my connecting flight boarding pass until four hrs before departure! Ver annoying especially since the staff could not explain why!

Did not get a vegetarian option in 1st class and the video was not working.

Terrible experience delays going there and delays coming back will not be flying delta

I felt scammed. The priced advertised was different than what I paid. I paid the whole some online. I then got a call 20 minutes later saying I need to paid 70 more person. She said the price online is not the guaranteed price.

Delay and keep changing gates. I have to run around from B to C then to E.

Boarding was a little difficult. The gate area at O'Hare was very small and crowded due to multiple gates in the area. Could not hear the intercom, so had to rely on signage to see when my group was boarding and the signage was blocked by passengers standing in the gate. Flight was great and we arrived in Montreal on time.

When I booked it on Kayak it aaid that I wasn't allowed hamd luggage. I called United Airlines and it took them 6 minutes to figure out if I was allowed free hand luggage. Surely something that simple they should be able to tell me instantly.

Liked nothing. As per previous segment it was delay delay delay.

Basics were there, but a 5:15 flight with almost no food ans no entertainment, it is quite long.

Extremely uncomfortable sitting in a small space for 2 hours, especially for older people. Understood it was circumstantial.

I feel like they have upgraded the app since I last flew United and I found it to be super helpful. I had stopped flying United unless absolutely necessary and my experience on this trip indicates they have been working hard to improve their services.

We left really late. Things that were out if anybody’s control I guess.

Excellent as always. Service was excellent and fully bilingual. Cannot complain .Will travel again. Always have and will continue. Highly recommended.

Due to delays at SFO, my WestJet light missed its connecting WestJet flight. If they had held the plane in Calgary for 15 minutes, 2 families with children would not have been stranded in Calgary for more than 24 hours. I understand the need to be on-time, but when it is the same company, you would think they could make a phone call. Or maybe they could go to a higher altitude to make up for lost time? Instead of attempting to put us on another flight, they rescheduled us for the same connecting flight 24 hours later. We then had to scramble to find a hotel, which they state that they were not responsible for since the delay was not their fault and therefore became an additional out of pocket expense for us. The customer service is severely lacking here at this company. They also mentioned that if we purchased our tickets through a 3rd party site (Kayak) versus WestJet directly, that they couldn't help us. Seriously?? Additionally, we lost 2 days of travel and missed out on tours and taxis that were pre-booked. I will not be using WestJet again,

This airline would not refund my money and I had a physician note that I could not fly. They are crooks

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.

Terrible decision to take a night flight. Not enough time to sleep and premium seat has no foot rest ao couldn’t get comfortable!

Scrooge airlines spoiled my last chance at Christmas with my 95 and 92 year old folks. and rest of the family in Calgary. Ticket personnel would not let me on without a passport and I always visit Canada with my enhanced driver;s License when I travel from the US

See review from the other leg San Antonio to Atlanta.. basically the same experience as the flight was operated by Delta.

Westjet is the worst airline in the world, they are absolutely terrible, there are to many things that happened that I can't explain in this message, I would like to talk to someone about my ordeal. I am partial handicapped and that I can only walk a short distance, I calculated how far I walked and it was more than a kilometer, the pain is so bad today I have to go to my docor, they told me there was nobody available to take me to my gate, this is just one instance. This is not finished yet, I need to contact westjet and let them know about my trip from hell

20+imite delay on the plane with no air. Part of our group had no seats assigned and took a long time to get fixed. Again no wifi and snacks were sad

They lost our luggage and didn’t return it until 15 days AFTER we got back.

Flight booked from Montreal via Toronto to Huatulco. Toronto to Huatulco flight was cancelled, lost one day of vacation in Toronto waiting for next flight. Flight from Huatulco to Toronto delayed, missed connection to Montreal. Westjet counter closed. No hotel, no connection flight for 4 days to Montreal to finish the journey. I shall go to Small Claims Court to get compensation for all these troubles. Westjet never again.

Multiple delays and flight cancellations meant that I arrived five and a half hours late at my destination. There was limited communication from the airline. The airline left my checked bag at my departure city and stopped tracking it almost immediately. The airline has made no apparent effort to return my bag despite filing a report, and has provided no communication or ability to check on the status of the bag.

I'm 6'8" (2.03m) so more legroom would alwqys be appreciated, especially on long international flights. The food choices were underwhelming.

1didnt have wheel chair I ordered wheel chair in my ticket flight

The Montreal to Barcelona flight was cancelled half hour before boarding. We had to struggle for hours to find an alternative route through a very long route with 6 hours of transit time in Munich. It wasted almost one full day of our long awaited vacation. We are extremely disappointed.

A220 plane had 5 seats across which is great for couples who can snag the A&C seats. Seat itself is borderline comfortable but still tough on a 5+ hour flight. Overhead bins are small so if you're not in at least boarding group 5, you could be in trouble. No included food service. Non-alcoholic drinks are free but even the most basic snacks are for a charge. Price was reasonable for the only direct SEA-YUL flight. Boarding is efficient even managing passport checks. Worth flying for the direct flight.

It took 66 hours to get from Seattle to Tel Aviv. As a minor, I was left for more than 12 hours in Toronto and Frankfurt without hotel and food vouchers. It took 5 layovers. It was insane and not okay

Well it was cancelled and we were forced to sleep in a closed airport, check back in at 4:30 for 9 am flight that was also delayed an hour…

The flight was 4 hrs 35 minutes long, the good and beverages didn't come to us until over 2hrs into the flight. The boarding was confusing as the employee flipped the sign right before boarding started, which confused everyone, she was very apathetic.

Full flight with a newer aircraft was comfortable. Would like to see some complimentary snacks on a flight over 4 hours. The flight crew was very nice.

Flight was late and then they made us sit on the plane

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

Information on your arrival and departure airports