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Cheap flights from Seattle to Montreal from C$ 229

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 12/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YMQ
3 Sep — 10 Sep1
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 65 days in advance, depart on a Wednesday or Monday and return on a Tuesday

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 4 August 2026.

Thu 27/87:35 p.m. -
1 stop8h 30m
Wed 2/95:00 p.m. -
1 stop8h 42m
Deal found 2/8C$ 501
Thu 27/87:20 p.m. -
2 stops8h 50m
Wed 2/99:00 a.m. -
2 stops12h 32m
Deal found 2/8C$ 510
Mon 21/97:35 p.m. -
1 stop8h 30m
Thu 24/96:45 a.m. -
2 stops15h 00m
Deal found 31/7C$ 518
Thu 1/107:35 p.m. -
1 stop8h 30m
Wed 7/106:45 a.m. -
2 stops15h 00m
Deal found 31/7C$ 519
Thu 1/1010:30 a.m. -
2 stops10h 55m
Sun 4/106:45 a.m. -
2 stops15h 00m
Deal found 2/8C$ 522
Thu 8/107:35 p.m. -
1 stop8h 30m
Sun 11/107:15 a.m. -
1 stop14h 30m
Deal found 30/7C$ 524
Fri 11/97:35 p.m. -
1 stop8h 30m
Mon 14/98:00 p.m. -
1 stop16h 40m
Deal found 31/7C$ 525
Sun 4/107:35 p.m. -
1 stop8h 30m
Sat 10/107:15 a.m. -
1 stop14h 30m
Deal found 31/7C$ 526
Thu 1/107:35 p.m. -
1 stop8h 30m
Thu 8/106:45 a.m. -
2 stops15h 00m
Deal found 31/7C$ 528

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 4 August 2026.

Round-trip from

C$ 501

One-way from

C$ 229

Popular in

June

Cheapest in

March

Average price

C$ 851
Air Canada
  • Air Canada
  • 27/8-2/9
  • 2 total stops
  • 17h 12m total
  • Seattle to Montreal
Search Deals
WestJet
  • WestJet
  • 12/9
  • 1 total stop
  • 8h 30m total
  • Seattle to Montreal
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (C$ 228 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 31 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 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 4 August 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 16/10

10:30 a.m.-12:25 a.m.

2 stops10h 55m

Montreal Pierre Elliott Trudeau Intl

Sun 18/10

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

2 stops15h 00m

C$ 522

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Tue 1/9

5:13 p.m.-10:40 a.m.

1 stop14h 27m

Montreal Pierre Elliott Trudeau Intl

Tue 8/9

6:00 p.m.-10:47 p.m.

1 stop7h 47m

C$ 616

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Tue 18/8

5:13 p.m.-10:40 a.m.

1 stop14h 27m

Montreal Pierre Elliott Trudeau Intl

Wed 26/8

11:23 a.m.-6:41 p.m.

1 stop10h 18m

C$ 623

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Sat 17/10

10:48 p.m.-1:09 p.m.

1 stop11h 21m

Montreal Pierre Elliott Trudeau Intl

Wed 21/10

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

2 stops12h 12m

C$ 639

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Wed 19/8

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

1 stop11h 42m

Montreal Pierre Elliott Trudeau Intl

Sun 23/8

7:00 a.m.-4:44 p.m.

1 stop12h 44m

C$ 657

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Thu 20/8

5:13 p.m.-10:40 a.m.

1 stop14h 27m

Montreal Pierre Elliott Trudeau Intl

Tue 25/8

9:15 a.m.-4:06 p.m.

1 stop9h 51m

C$ 657

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Sat 17/10

5:00 a.m.-10:06 p.m.

2 stops14h 06m

Montreal Pierre Elliott Trudeau Intl

Wed 21/10

9:45 a.m.-5:37 p.m.

2 stops10h 52m

C$ 667

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Wed 19/8

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

1 stop11h 42m

Montreal Pierre Elliott Trudeau Intl

Mon 24/8

7:00 a.m.-4:00 p.m.

1 stop12h 00m

C$ 685

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Wed 19/8

5:20 p.m.-8:16 a.m.

1 stop11h 56m

Montreal Pierre Elliott Trudeau Intl

Sun 23/8

7:30 a.m.-10:42 p.m.

1 stop18h 12m

C$ 685

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Tue 18/8

8:59 a.m.-11:40 p.m.

1 stop11h 41m

Montreal Pierre Elliott Trudeau Intl

Mon 24/8

7:00 a.m.-4:00 p.m.

1 stop12h 00m

C$ 688

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/8

Showing 1-10 of 22 resultsSorted by cheapest first
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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, March is the cheapest month in which you can book a flight from Seattle to Montreal (average of C$ 656). Flying from Seattle to Montreal in December is currently the most expensive (average of C$ 1,158). 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?

Airfare is below average for this route at the moment.
Seattle to Montreal flights typically cost between C$ 661 and C$ 1,133 in August.
The cheapest round-trip price found within the last 5 days was C$ 501 on Multiple Airlines (27 Aug-2 Sep).

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

Booking 63 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.

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?

    WestJet, United Airlines, and Delta can get you from Seattle to Montreal in just under 10h 55m. Your travel time can differ by up to 3h 32m. 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$ 156), Air Canada (C$ 262), and United Airlines (C$ 300).

  • 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, March is the cheapest month in which you can book a flight from Seattle to Montreal (average of C$ 656). Flying from Seattle to Montreal in December is currently the most expensive (average of C$ 1,158). 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.

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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.

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