Find flights
When to book
Airlines
FAQs

Cheap flights from Seattle to Montreal from C$ 260

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 25/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YMQ
20 Jul — 27 Jul1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Montreal are usually found in March or September, booked 76 days in advance, depart on a Thursday or Saturday and return on a Wednesday

Cheap flight deals from Seattle to Montreal

Enter your travel dates to find the best prices.

Cheapest flights from Seattle to Montreal
Explore the most affordable flight options available from Seattle to Montreal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 20 June 2026.

Sun 20/97:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Thu 24/96:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Deal found 15/6C$ 552
Thu 1/107:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Fri 9/106:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Deal found 19/6C$ 563
Fri 2/107:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Mon 12/106:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Deal found 16/6C$ 566
Thu 13/85:50 a.m.
SEA
-
YUL
2 stops11h 45m
Air Canada
Wed 19/82:15 p.m.
YUL
-
SEA
2 stops11h 27m
Air Canada
Deal found 19/6C$ 568
Sat 3/107:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Thu 8/106:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Deal found 19/6C$ 570
Sun 20/97:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Fri 25/96:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Deal found 16/6C$ 573
Tue 8/97:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Thu 10/96:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Deal found 15/6C$ 575
Mon 14/97:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Fri 18/96:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Deal found 15/6C$ 576
Fri 28/87:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Tue 8/96:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Deal found 15/6C$ 578
Thu 13/810:30 a.m.
SEA
-
YUL
2 stops10h 55m
Multiple Airlines
Wed 19/85:30 p.m.
YUL
-
SEA
1 stop8h 12m
Multiple Airlines
Deal found 19/6C$ 579
Wed 9/97:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Thu 17/97:15 a.m.
YUL
-
SEA
1 stop14h 30m
WestJet
Deal found 18/6C$ 580

Find flight deals from Seattle to Montreal

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Montreal (YMQ). 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 20 June 2026.

Round-trip from

C$ 552

One-way from

C$ 260

Popular in

December

Cheapest in

March

Average price

C$ 1,035
WestJet
  • WestJet
  • 20/9-24/9
  • 3 total stops
  • 23h 30m total
  • Seattle to Montreal
Search Deals
WestJet
  • WestJet
  • 25/9
  • 1 total stop
  • 8h 30m total
  • Seattle to Montreal
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (C$ 98 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 33 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Montreal 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 20 June 2026.
Use the filters below to find and compare flights from Seattle to Montreal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Fri 18/9

12:15 p.m.-8:16 a.m.

2 stops17h 01m

Montreal Pierre Elliott Trudeau Intl

Sat 19/9

11:23 a.m.-6:46 p.m.

1 stop10h 23m

C$ 641

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Fri 10/7

7:35 p.m.-7:05 a.m.

1 stop8h 30m

Montreal Pierre Elliott Trudeau Intl

Fri 17/7

8:00 p.m.-6:45 p.m.

1 stop25h 45m

C$ 647

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Sat 26/9

10:58 p.m.-4:10 p.m.

1 stop14h 12m

Montreal Pierre Elliott Trudeau Intl

Tue 6/10

1:30 p.m.-10:42 p.m.

2 stops12h 12m

C$ 668

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Sat 11/7

9:45 a.m.-11:25 p.m.

1 stop10h 40m

Montreal Pierre Elliott Trudeau Intl

Tue 14/7

12:44 p.m.-11:59 p.m.

1 stop14h 15m

C$ 670
Quickest round-trip

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Sun 20/9

7:00 a.m.-5:30 p.m.

1 stop7h 30m

Montreal Pierre Elliott Trudeau Intl

Mon 21/9

3:25 p.m.-11:36 p.m.

1 stop11h 11m

C$ 675

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Sat 17/10

3:00 p.m.-7:10 a.m.

2 stops13h 10m

Montreal Pierre Elliott Trudeau Intl

Tue 20/10

11:10 a.m.-6:32 p.m.

2 stops10h 22m

C$ 681

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Thu 20/8

9:10 a.m.-11:52 p.m.

1 stop11h 42m

Montreal Pierre Elliott Trudeau Intl

Tue 25/8

7:00 a.m.-2:50 p.m.

1 stop10h 50m

C$ 688

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Wed 19/8

1:16 p.m.-8:16 a.m.

1 stop16h 00m

Montreal Pierre Elliott Trudeau Intl

Sun 23/8

7:30 a.m.-2:22 p.m.

1 stop9h 52m

C$ 691

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Tue 18/8

10:30 a.m.-4:45 p.m.

2 stops27h 15m

Montreal Pierre Elliott Trudeau Intl

Tue 8/9

6:45 a.m.-6:45 p.m.

2 stops15h 00m

C$ 705

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Tue 30/6

8:15 a.m.-7:45 p.m.

1 stop8h 30m

Montreal Pierre Elliott Trudeau Intl

Sat 22/8

9:45 a.m.-5:42 p.m.

2 stops10h 57m

C$ 720

Flights are sorted by cheapest round-trip flights first.

Deals found on 18/6

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

Best time to book a flight from Seattle to Montreal

Have a flexible travel schedule? Discover the best time to fly to Montreal from Seattle 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 Seattle to Montreal

What is the cheapest month to book a flight from Seattle to Montreal?

Currently, May is the cheapest month in which you can book a flight from Seattle to Montreal (average of C$ 214). Flying from Seattle to Montreal in April is currently the most expensive (average of C$ 606). 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.

How much does it cost to fly round-trip from Seattle to Montreal?

What’s the top layover airport for flights from Seattle to Montreal?

Share of one-stop round-trip flights from Seattle to Montreal chosen by Cheapflights users in the past 12 months, using the same layover each way.

Calgary (YYC) – chosen by Cheapflights users on 75% of one-stop itineraries from Seattle to Montreal on Cheapflights.

What’s the cheapest layover airport for flights from Seattle to Montreal?

Average round-trip fare for 1-stop flights from Seattle to Montreal, 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$ 574.

What’s the fastest layover option from Seattle to Montreal?

Shortest average travel time for 1-stop one-way flights from Seattle to Montreal, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Calgary (YYC) have the shortest average one-way travel time for 1-stop routes: 8h 30m.

Which airport typically offers the quickest layover for flights from Seattle to Montreal?

Average layover duration for 1-stop one-way flights from Seattle to Montreal, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via San Francisco (SFO) offer the fastest connection on this route, with an average layover time of 1h 06m.

How far ahead should I book a flight from Seattle to Montreal?

Booking 72 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Montreal. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Reviews of airlines servicing Montreal

Get insights into the airlines that provide service to Montreal. 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 Montreal. Reviews last updated 20 June 2026.
See what other customers who have flown with Air Canada from Seattle to Montreal have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Canada
7.1
Good
11,226 reviews
Check prices

Boarding

7.3

Entertainment

6.8

Overall

7.1

Comfort

7.1

Food

6.3

Crew

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,May 2026

YYJ - YUL

The pouch in front of my seat was never cleaned. The hospitality I requested wasn't there for me. Perhaps as looking at me you wouldn't think I needed it. I push myself then pay for it later. Like last night and today....... The flight had a generator problem, we had to debark the plane as there was no staff to repair it , therefore we had to wait for staff to come from Vancouver to repair it. The staff on hand though were very good at keeping us informed and making sure of any questions we had at that point. Once repaired all went well. Then just the hospitality wasn't there. When I did ask at the desk after the long walk from the plane the young person attending said baggage is just over there. Well just over there to a 30 year old and a 76 year old with mobility problems is quite different !
Air Canada
7.1
Good
11,226 reviews
Air Canada
7.1
Good
11,226 reviews
Check prices

Boarding

7.3

Entertainment

6.8

Overall

7.1

Comfort

7.1

Food

6.3

Crew

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,May 2026

YYJ - YUL

The pouch in front of my seat was never cleaned. The hospitality I requested wasn't there for me. Perhaps as looking at me you wouldn't think I needed it. I push myself then pay for it later. Like last night and today....... The flight had a generator problem, we had to debark the plane as there was no staff to repair it , therefore we had to wait for staff to come from Vancouver to repair it. The staff on hand though were very good at keeping us informed and making sure of any questions we had at that point. Once repaired all went well. Then just the hospitality wasn't there. When I did ask at the desk after the long walk from the plane the young person attending said baggage is just over there. Well just over there to a 30 year old and a 76 year old with mobility problems is quite different !

Related info for your journey

Find useful and relevant information for your journey from Seattle to Montreal. 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 from for flights from Seattle to Montreal?

    Most people fly from Seattle/Tacoma Intl (SEA) if they book a flight from Seattle to Montreal. On average, Seattle/Tacoma Intl has 0 outbound flights to Montreal per day from 0 airlines. Seattle/Tacoma Intl is conveniently located just 18.4 km from Seattle’s city centre.

  • How long is the flight from Seattle to Montreal?

    United Airlines, WestJet, and Delta can get you from Seattle to Montreal in just under 8h 30m. Your travel time can differ by up to 8h 31m. Airlines will cover a distance of 3663 km. Both multi-stop and direct flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Seattle to Montreal one-way?

    The cheapest airlines for a one-way flight from Seattle to Montreal are WestJet (C$ 157), Air Canada (C$ 243), and United Airlines (C$ 324).

  • Can I find deals for flights from Seattle to Montreal that include hotel bookings?

    Yes. In addition to deals on Seattle to Montreal flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Montreal?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Montreal.

  • Can I find deals for business class flights from Seattle to Montreal?

    Yes. Cheapflights offers flight deals from Seattle to Montreal 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 Seattle to Montreal?

    Currently, May is the cheapest month in which you can book a flight from Seattle to Montreal (average of C$ 214). Flying from Seattle to Montreal in April is currently the most expensive (average of C$ 606). 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Fly with Cheapflights

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 Seattle to Montreal?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Seattle to Montreal. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Montreal?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Montreal from Seattle.

Can Cheapflights find flights from Seattle to Montreal with no change fees?

Need flexible booking options for your flight to Montreal from Seattle? 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 Seattle to Montreal become cheaper?

Of course! You can now track prices for flights from Seattle to Montreal and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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.