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Cheap flights from Montreal to Seattle from $165

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 1/14. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
WestJet Logo
7:30 pm - 2:35 pmYUL-SEA
22h 05m1 stop
WestJet Logo
3:10 pm - 7:05 amSEA-YUL
12h 55m1 stop
$361WestJet
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Tue, Dec 2 - Tue, Dec 9
WestJet Logo
7:30 pm - 2:20 pmYUL-SEA
21h 50m1 stop
WestJet Logo
3:10 pm - 7:05 amSEA-YUL
12h 55m1 stop
$364WestJet
Find Deal
Thu, Dec 4 - Thu, Dec 11
WestJet Logo
4:15 pm - 2:20 pmYUL-SEA
25h 05m1 stop
WestJet Logo
3:10 pm - 7:05 amSEA-YUL
12h 55m1 stop
$366WestJet
Find Deal
Mon, Nov 24 - Mon, Dec 8
WestJet Logo
4:15 pm - 2:35 pmYUL-SEA
25h 20m1 stop
WestJet Logo
3:10 pm - 12:43 amSEA-YUL
30h 33m2 stops
$371WestJet
Find Deal
Tue, Dec 2 - Tue, Dec 9
Multiple Airlines Logo
6:45 am - 2:20 pmYUL-SEA
10h 35m2 stops
Multiple Airlines Logo
11:10 pm - 4:27 pmSEA-YUL
14h 17m1 stop
$375Multiple Airlines
Find Deal
Fri, Nov 14 - Wed, Nov 19
Delta Logo
7:10 am - 6:41 pmYUL-SEA
14h 31m2 stops
Delta Logo
7:15 am - 11:42 pmSEA-YUL
13h 27m2 stops
$376Delta
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Tue, Nov 18 - Tue, Nov 25
Multiple Airlines Logo
6:45 am - 2:20 pmYUL-SEA
10h 35m2 stops
Multiple Airlines Logo
11:10 pm - 4:27 pmSEA-YUL
14h 17m1 stop
$377Multiple Airlines
Find Deal
Fri, Nov 14 - Wed, Nov 19
Delta Logo
7:10 am - 3:35 pmYUL-SEA
11h 25m2 stops
Delta Logo
9:43 am - 11:42 pmSEA-YUL
10h 59m2 stops
$397Delta
Find Deal
Fri, Nov 14 - Wed, Nov 19
American Airlines Logo
3:44 pm - 10:45 amYUL-SEA
22h 01m1 stop
American Airlines Logo
11:20 pm - 3:18 pmSEA-YUL
12h 58m1 stop
$441American Airlines
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Sat, Nov 1 - Sat, Nov 8
American Airlines Logo
12:59 pm - 10:10 pmYUL-SEA
12h 11m1 stop
American Airlines Logo
12:38 am - 3:10 pmSEA-YUL
11h 32m1 stop
$445American Airlines
Find Deal
Mon, Nov 24 - Sun, Dec 7

WestJet flights from Montreal to Seattle

Our best WestJet deals on Montreal to Seattle flight tickets
WestJet
Dec 2
YUL7:30 pmMontreal Pierre Elliott Trudeau Intl
22h 05m
1 stop
SEA2:35 pmSeattle/Tacoma Intl
Dec 9
SEA3:10 pmSeattle/Tacoma Intl
12h 55m
1 stop
YUL7:05 amMontreal Pierre Elliott Trudeau Intl
$361
Find similar
WestJet
Dec 4
YUL7:30 pmMontreal Pierre Elliott Trudeau Intl
21h 50m
1 stop
SEA2:20 pmSeattle/Tacoma Intl
Dec 11
SEA3:10 pmSeattle/Tacoma Intl
12h 55m
1 stop
YUL7:05 amMontreal Pierre Elliott Trudeau Intl
$364
Find similar
WestJet
Nov 24
YUL4:15 pmMontreal Pierre Elliott Trudeau Intl
25h 05m
1 stop
SEA2:20 pmSeattle/Tacoma Intl
Dec 8
SEA3:10 pmSeattle/Tacoma Intl
12h 55m
1 stop
YUL7:05 amMontreal Pierre Elliott Trudeau Intl
$366
Find similar

Delta flights from Montreal to Seattle

Our best Delta deals on Montreal to Seattle flight tickets
Delta
Nov 18
YUL7:10 amMontreal Pierre Elliott Trudeau Intl
14h 31m
2 stops
SEA6:41 pmSeattle/Tacoma Intl
Nov 25
SEA7:15 amSeattle/Tacoma Intl
13h 27m
2 stops
YUL11:42 pmMontreal Pierre Elliott Trudeau Intl
$376
Find similar
Delta
Nov 14
YUL7:10 amMontreal Pierre Elliott Trudeau Intl
11h 25m
2 stops
SEA3:35 pmSeattle/Tacoma Intl
Nov 19
SEA9:43 amSeattle/Tacoma Intl
10h 59m
2 stops
YUL11:42 pmMontreal Pierre Elliott Trudeau Intl
$397
Find similar
Delta
Nov 1
YUL6:00 amMontreal Pierre Elliott Trudeau Intl
11h 35m
1 stop
SEA2:35 pmSeattle/Tacoma Intl
Nov 8
SEA7:45 pmSeattle/Tacoma Intl
12h 55m
2 stops
YUL11:40 amMontreal Pierre Elliott Trudeau Intl
$407
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 October 20, 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 12/2

7:30 pm-2:35 pm

1 stop22h 05m

Seattle/Tacoma Intl

Tue 12/9

3:10 pm-7:05 am

1 stop12h 55m

$361

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Thu 12/4

7:30 pm-2:20 pm

1 stop21h 50m

Seattle/Tacoma Intl

Thu 12/11

3:10 pm-7:05 am

1 stop12h 55m

$364

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 11/24

4:15 pm-2:20 pm

1 stop25h 05m

Seattle/Tacoma Intl

Mon 12/8

3:10 pm-7:05 am

1 stop12h 55m

$366

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Tue 12/2

4:15 pm-2:35 pm

1 stop25h 20m

Seattle/Tacoma Intl

Tue 12/9

3:10 pm-12:43 am

2 stops30h 33m

$371

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Fri 11/14

6:45 am-2:20 pm

2 stops10h 35m

Seattle/Tacoma Intl

Wed 11/19

11:10 pm-4:27 pm

1 stop14h 17m

$375

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Tue 11/18

7:10 am-6:41 pm

2 stops14h 31m

Seattle/Tacoma Intl

Tue 11/25

7:15 am-11:42 pm

2 stops13h 27m

$376

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Fri 11/14

6:45 am-2:20 pm

2 stops10h 35m

Seattle/Tacoma Intl

Wed 11/19

11:10 pm-4:27 pm

1 stop14h 17m

$377

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Fri 11/14

7:10 am-3:35 pm

2 stops11h 25m

Seattle/Tacoma Intl

Wed 11/19

9:43 am-11:42 pm

2 stops10h 59m

$397

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sat 11/1

3:44 pm-10:45 am

1 stop22h 01m

Seattle/Tacoma Intl

Sat 11/8

11:20 pm-3:18 pm

1 stop12h 58m

$441

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 11/24

12:59 pm-10:10 pm

1 stop12h 11m

Seattle/Tacoma Intl

Sun 12/7

12:38 am-3:10 pm

1 stop11h 32m

$445

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, September 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 $479. If you don’t want to visit Seattle in September, then you should wait until August to fly from Montreal, when ticket prices are also cheap, with an average price of $480.

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 $360 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 $503 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.

How have Montreal to Seattle flight prices changed over time?

As of October 2025, prices for Montreal to Seattle flights are approximately 7% 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

$745

Direct flights

None
The best flight deal from Montreal to Seattle found on momondo in the last 72 hours is $745
There are no direct flights from Montreal to Seattle. There are no popular flight routes from Montreal to Seattle.
Search flight deals

  • 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 10h 35m 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
3,129 reviews
Search WestJet flights
Air CanadaPriceFrom $316Free CancellationRating
7.1
10,335 reviews
Search Air Canada flights
United AirlinesPriceFrom $516Free CancellationRating
7.4
8,991 reviews
Search United Airlines flights

  • United Airlines Flights From Montreal to Seattle

    United Airlines flight deals from Montreal to Seattle start from $516 round-trip. Over the 7 United Airlines flights for this route in a normal week, average airfare is usually $890 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
Tacoma
Leavenworth
SeaTac
Ocean Shores
Renton
Olympia
Lynnwood
Kent
Marysville
Puyallup
Federal Way
Tukwila
Lakewood
Kirkland
Fife
Centralia
Shoreline
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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