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Cheap flights from Montreal to Seattle from $143

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Montreal to Seattle departing on 10/23. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Montreal to Seattle

Cheap round-trip flights

WestJet Logo
6:45 am - 12:59 pmYUL-SEA
33h 14m2 stops
WestJet Logo
3:10 pm - 12:43 amSEA-YUL
30h 33m2 stops
$332WestJet
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Tue, Oct 21 - Wed, Oct 29
Multiple Airlines Logo
5:30 pm - 12:35 pmYUL-SEA
22h 05m2 stops
Multiple Airlines Logo
3:10 pm - 1:32 pmSEA-YUL
19h 22m1 stop
$334Multiple Airlines
Find Deal
Sat, Oct 11 - Thu, Oct 30
Air Canada Logo
4:10 pm - 10:16 pmYUL-SEA
9h 06m1 stop
Air Canada Logo
8:15 am - 8:44 pmSEA-YUL
9h 29m2 stops
$335Air Canada
Find Deal
Sun, Feb 8 - Mon, Feb 16
Air Canada Logo
7:30 am - 2:31 pmYUL-SEA
10h 01m1 stop
Air Canada Logo
8:15 am - 9:52 pmSEA-YUL
10h 37m1 stop
$341Air Canada
Find Deal
Sat, Dec 6 - Fri, Dec 12
Delta Logo
6:00 am - 2:35 pmYUL-SEA
11h 35m1 stop
Delta Logo
6:00 am - 3:49 pmSEA-YUL
6h 49m1 stop
$344Delta
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Sat, Oct 11 - Thu, Oct 30
Delta Logo
2:35 pm - 11:29 pmYUL-SEA
11h 54m1 stop
Delta Logo
12:59 am - 1:44 pmSEA-YUL
9h 45m1 stop
$355Delta
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Thu, Dec 25 - Tue, Dec 30
United Airlines Logo
4:45 pm - 7:31 pmYUL-SEA
5h 46mnonstop
United Airlines Logo
7:15 am - 3:28 pmSEA-YUL
5h 13mnonstop
$366United Airlines
Find Deal
Sun, Sep 28 - Sun, Oct 5
American Airlines Logo
2:35 pm - 9:40 amYUL-SEA
22h 05m2 stops
American Airlines Logo
2:42 pm - 12:24 pmSEA-YUL
18h 42m2 stops
$372American Airlines
Find Deal
Mon, Oct 6 - Thu, Oct 30
American Airlines Logo
7:10 am - 9:19 pmYUL-SEA
17h 09m2 stops
American Airlines Logo
12:27 am - 3:00 pmSEA-YUL
11h 33m2 stops
$375American Airlines
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Tue, Feb 10 - Tue, Feb 10
United Airlines Logo
8:05 am - 12:59 amYUL-SEA
19h 54m1 stop
United Airlines Logo
11:59 pm - 4:28 pmSEA-YUL
13h 29m1 stop
$380United Airlines
Find Deal
Sun, Oct 5 - Mon, Oct 27

Delta flights from Montreal to Seattle

Our best Delta deals on Montreal to Seattle flight tickets
Delta
Oct 11
YUL6:00 amMontreal Pierre Elliott Trudeau Intl
11h 35m
1 stop
SEA2:35 pmSeattle/Tacoma Intl
Oct 30
SEA6:00 amSeattle/Tacoma Intl
6h 49m
1 stop
YUL3:49 pmMontreal Pierre Elliott Trudeau Intl
$344
Find similar
Delta
Dec 25
YUL2:35 pmMontreal Pierre Elliott Trudeau Intl
11h 54m
1 stop
SEA11:29 pmSeattle/Tacoma Intl
Dec 30
SEA12:59 amSeattle/Tacoma Intl
9h 45m
1 stop
YUL1:44 pmMontreal Pierre Elliott Trudeau Intl
$355
Find similar
Delta
Oct 14
YUL12:55 pmMontreal Pierre Elliott Trudeau Intl
12h 08m
1 stop
SEA10:03 pmSeattle/Tacoma Intl
Oct 21
SEA11:15 pmSeattle/Tacoma Intl
9h 47m
1 stop
YUL12:02 pmMontreal Pierre Elliott Trudeau Intl
$358
Find similar

United Airlines flights from Montreal to Seattle

Our best United Airlines deals on Montreal to Seattle flight tickets
United Airlines
Sep 28
YUL4:45 pmMontreal Pierre Elliott Trudeau Intl
5h 46m
SEA7:31 pmSeattle/Tacoma Intl
Oct 5
SEA7:15 amSeattle/Tacoma Intl
5h 13m
YUL3:28 pmMontreal Pierre Elliott Trudeau Intl
$366
Find similar
United Airlines
Oct 5
YUL8:05 amMontreal Pierre Elliott Trudeau Intl
19h 54m
1 stop
SEA12:59 amSeattle/Tacoma Intl
Oct 27
SEA11:59 pmSeattle/Tacoma Intl
13h 29m
1 stop
YUL4:28 pmMontreal Pierre Elliott Trudeau Intl
$380
Find similar
United Airlines
Oct 3
YUL3:41 pmMontreal Pierre Elliott Trudeau Intl
9h 36m
1 stop
SEA10:17 pmSeattle/Tacoma Intl
Oct 13
SEA7:15 amSeattle/Tacoma Intl
5h 13m
YUL3:28 pmMontreal Pierre Elliott Trudeau Intl
$405
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Montreal to Seattle 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, momondo users made 832,500 searches. Data last updated September 16, 2025.
Use the filters below to find and compare flights from Montreal to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Tue 10/21

6:45 am-12:59 pm

2 stops33h 14m

Seattle/Tacoma Intl

Wed 10/29

3:10 pm-12:43 am

2 stops30h 33m

$332

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sat 10/11

5:30 pm-12:35 pm

2 stops22h 05m

Seattle/Tacoma Intl

Thu 10/30

3:10 pm-1:32 pm

1 stop19h 22m

$334

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sun 2/8

4:10 pm-10:16 pm

1 stop9h 06m

Seattle/Tacoma Intl

Mon 2/16

8:15 am-8:44 pm

2 stops9h 29m

$335

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sat 12/6

7:30 am-2:31 pm

1 stop10h 01m

Seattle/Tacoma Intl

Fri 12/12

8:15 am-9:52 pm

1 stop10h 37m

$341

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sat 10/11

6:00 am-2:35 pm

1 stop11h 35m

Seattle/Tacoma Intl

Thu 10/30

6:00 am-3:49 pm

1 stop6h 49m

$344

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Thu 12/25

2:35 pm-11:29 pm

1 stop11h 54m

Seattle/Tacoma Intl

Tue 12/30

12:59 am-1:44 pm

1 stop9h 45m

$355

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sun 9/28

4:45 pm-7:31 pm

Nonstop5h 46m

Seattle/Tacoma Intl

Sun 10/5

7:15 am-3:28 pm

Nonstop5h 13m

$366

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 10/6

2:35 pm-9:40 am

2 stops22h 05m

Seattle/Tacoma Intl

Thu 10/30

2:42 pm-12:24 pm

2 stops18h 42m

$372

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Tue 2/10

7:10 am-9:19 pm

2 stops17h 09m

Seattle/Tacoma Intl

Tue 2/10

12:27 am-3:00 pm

2 stops11h 33m

$375

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sun 10/5

8:05 am-12:59 am

1 stop19h 54m

Seattle/Tacoma Intl

Mon 10/27

11:59 pm-4:28 pm

1 stop13h 29m

$380

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Seattle from

How to get the cheapest flight ticket from Montreal to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Montreal and Seattle?

What is the cheapest month to fly to Seattle?

In general, August is the cheapest month to fly from Montreal to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $480. If you don’t want to visit Seattle in August, then you should wait until October to fly from Montreal, when ticket prices are also cheap, with an average price of $485.

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from Montreal is on a Monday. momondo users have found tickets for Monday departures for as low as $282. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Tuesday is the most expensive day to depart from Montreal because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $475.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from Montreal in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $359 when looking at flights departing in the afternoon. Flights to Seattle are more costly in the morning, with an average ticket price of $503. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Montreal to Seattle/Tacoma Intl flight route?

Fly from Montreal Pierre Elliott Trudeau Intl to Seattle/Tacoma Intl for the best Montreal - Seattle/Tacoma Intl flight prices

How far in advance should I book a flight to Seattle?

You are more likely to see cheaper flights to Seattle from Montreal when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $502 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Montreal for as low as $360 on momondo.

What cabin class options are available on Montreal to Seattle/Tacoma Intl flights?

There are 3 cabin classes available to choose from on Montreal to Seattle/Tacoma Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Montreal to Seattle flights?

You could potentially save up to 18% on your flight if you consider stops on a Montreal to Seattle flight.

How have Montreal to Seattle flight prices changed over time?

As of September 2025, prices for Montreal to Seattle flights are approximately 6% cheaper when compared to flights at the same time last year.

When to book flights from Montreal to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Montreal to Seattle according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Montreal to Seattle (YMQ to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Montreal to Seattle

Best Price Found

$259

Fastest flight time

5h 46m

Direct flights

Mon, Tue, Thu, Fri, Sat and Sun

Airports in Seattle

1 airport
The best one-way flight to Seattle from Montreal in the past 72 hours is $259. The best round-trip flight deal from Montreal to Seattle found on momondo in the last 72 hours is $263.
The fastest flight from Montreal to Seattle takes 5h 46m
Direct flights go from Montreal to Seattle on Monday, Tuesday, Thursday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)
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  • How far is Montreal to Seattle/Tacoma Intl by plane?

    Montreal and Seattle/Tacoma Intl are 2282.0 mi apart from one another. Typically, this will take 5h 46m by plane in normal conditions.

  • When did momondo last update prices for flights from Montreal to Seattle/Tacoma Intl Airport?

    Prices for flights from Montreal to Seattle/Tacoma Intl Airport are updated daily.

  • How many operators does momondo search for flights from Montreal to Seattle/Tacoma Intl Airport?

  • How old do you have to be to fly from Montreal to Seattle/Tacoma Intl Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Montreal to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Montreal to Seattle?

  • What is the most popular airline from Montreal to Seattle?

Best airlines flying from Montreal to Seattle

Compare and see reviews for airlines that fly from Montreal to Seattle with momondo
Airline
Rating
Free Cancellation
Price
WestJetPriceFrom $270Free CancellationRating
7.2
3,093 reviews
Search WestJet flights
Air CanadaPriceFrom $326Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights

  • Air Canada Flights From Montreal to Seattle

    Air Canada flight deals from Montreal to Seattle start from $326 round-trip. Over the 7 Air Canada flights for this route in a normal week, average airfare is usually $469 round-trip - but some users have found much cheaper deals with momondo.

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
Tacoma
SeaTac
Ocean Shores
Renton
Olympia
Lynnwood
Kent
Marysville
Puyallup
Federal Way
Kirkland
Tukwila
Shoreline
Lakewood
Centralia
Fife
Cle Elum
Redmond
Westport

Why use momondo?

Why should I use momondo to find a flight deal from Montreal to Seattle?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Seattle from Montreal.

Can I find flights from Montreal to Seattle with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Seattle from Montreal with this policy.

How can momondo help me find flights from Montreal to Seattle?

Once all potential Montreal to Seattle flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Montreal to Seattle right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Montreal to Seattle flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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