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Cheap flights from Montreal to Seattle from $155

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 1/9. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
WestJet Logo
6:45 am - 1:08 pmYUL-SEA
9h 23m1 stop
WestJet Logo
2:05 pm - 12:42 amSEA-YUL
7h 37m1 stop
$202WestJet
Find Deal
Sat, May 2 - Sat, May 9
WestJet Logo
4:15 pm - 2:19 pmYUL-SEA
25h 04m1 stop
WestJet Logo
2:05 pm - 12:42 amSEA-YUL
7h 37m1 stop
$229WestJet
Find Deal
Wed, Apr 22 - Wed, Apr 29
WestJet Logo
6:45 am - 1:08 pmYUL-SEA
9h 23m1 stop
WestJet Logo
7:05 am - 12:40 amSEA-YUL
14h 35m2 stops
$239WestJet
Find Deal
Sat, May 2 - Sat, May 9
WestJet Logo
9:00 pm - 2:19 pmYUL-SEA
20h 19m1 stop
WestJet Logo
2:05 pm - 12:42 amSEA-YUL
7h 37m1 stop
$240WestJet
Find Deal
Sat, Apr 4 - Mon, May 11
WestJet Logo
4:15 pm - 2:20 pmYUL-SEA
25h 05m1 stop
WestJet Logo
3:10 pm - 3:12 pmSEA-YUL
21h 02m1 stop
$256WestJet
Find Deal
Mon, Jan 12 - Mon, Jan 19
WestJet Logo
7:30 pm - 2:19 pmYUL-SEA
21h 49m1 stop
WestJet Logo
3:10 pm - 3:13 pmSEA-YUL
21h 03m1 stop
$257WestJet
Find Deal
Thu, Mar 19 - Mon, Mar 23
WestJet Logo
6:45 am - 2:19 pmYUL-SEA
34h 34m2 stops
WestJet Logo
3:10 pm - 3:13 pmSEA-YUL
21h 03m1 stop
$265WestJet
Find Deal
Thu, Mar 19 - Mon, Mar 23
WestJet Logo
6:45 am - 1:08 pmYUL-SEA
33h 23m2 stops
WestJet Logo
7:05 am - 12:40 amSEA-YUL
14h 35m2 stops
$267WestJet
Find Deal
Sat, May 2 - Sat, May 9
WestJet Logo
6:45 am - 2:19 pmYUL-SEA
34h 34m2 stops
WestJet Logo
3:10 pm - 12:38 amSEA-YUL
30h 28m2 stops
$270WestJet
Find Deal
Thu, Mar 19 - Mon, Mar 23
WestJet Logo
6:45 am - 2:20 pmYUL-SEA
34h 35m2 stops
WestJet Logo
3:10 pm - 3:12 pmSEA-YUL
21h 02m1 stop
$272WestJet
Find Deal
Mon, Jan 12 - Mon, Jan 19

WestJet flights from Montreal to Seattle

Our best WestJet deals on Montreal to Seattle flight tickets
WestJet
May 2
YUL6:45 amMontreal Pierre Elliott Trudeau Intl
9h 23m
1 stop
SEA1:08 pmSeattle/Tacoma Intl
May 9
SEA2:05 pmSeattle/Tacoma Intl
7h 37m
1 stop
YUL12:42 amMontreal Pierre Elliott Trudeau Intl
$202
Find similar
WestJet
Apr 22
YUL4:15 pmMontreal Pierre Elliott Trudeau Intl
25h 04m
1 stop
SEA2:19 pmSeattle/Tacoma Intl
Apr 29
SEA2:05 pmSeattle/Tacoma Intl
7h 37m
1 stop
YUL12:42 amMontreal Pierre Elliott Trudeau Intl
$229
Find similar
WestJet
May 2
YUL6:45 amMontreal Pierre Elliott Trudeau Intl
9h 23m
1 stop
SEA1:08 pmSeattle/Tacoma Intl
May 9
SEA7:05 amSeattle/Tacoma Intl
14h 35m
2 stops
YUL12:40 amMontreal Pierre Elliott Trudeau Intl
$239
Find similar

United Airlines flights from Montreal to Seattle

Our best United Airlines deals on Montreal to Seattle flight tickets
United Airlines
Dec 4
YUL2:13 pmMontreal Pierre Elliott Trudeau Intl
13h 37m
2 stops
SEA12:50 amSeattle/Tacoma Intl
Dec 7
SEA11:50 pmSeattle/Tacoma Intl
10h 38m
1 stop
YUL1:28 pmMontreal Pierre Elliott Trudeau Intl
$297
Find similar
United Airlines
Dec 11
YUL6:00 amMontreal Pierre Elliott Trudeau Intl
15h 32m
2 stops
SEA6:32 pmSeattle/Tacoma Intl
Jan 10
SEA3:30 pmSeattle/Tacoma Intl
19h 30m
2 stops
YUL2:00 pmMontreal Pierre Elliott Trudeau Intl
$342
Find similar
United Airlines
Dec 13
YUL5:50 pmMontreal Pierre Elliott Trudeau Intl
10h 00m
1 stop
SEA12:50 amSeattle/Tacoma Intl
Dec 17
SEA5:00 amSeattle/Tacoma Intl
8h 58m
1 stop
YUL4:58 pmMontreal Pierre Elliott Trudeau Intl
$357
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 November 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

Sat 5/2

6:45 am-1:08 pm

1 stop9h 23m

Seattle/Tacoma Intl

Sat 5/9

2:05 pm-12:42 am

1 stop7h 37m

$202

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Wed 4/22

4:15 pm-2:19 pm

1 stop25h 04m

Seattle/Tacoma Intl

Wed 4/29

2:05 pm-12:42 am

1 stop7h 37m

$229

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sat 5/2

6:45 am-1:08 pm

1 stop9h 23m

Seattle/Tacoma Intl

Sat 5/9

7:05 am-12:40 am

2 stops14h 35m

$239

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sat 4/4

9:00 pm-2:19 pm

1 stop20h 19m

Seattle/Tacoma Intl

Mon 5/11

2:05 pm-12:42 am

1 stop7h 37m

$240

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 1/12

4:15 pm-2:20 pm

1 stop25h 05m

Seattle/Tacoma Intl

Mon 1/19

3:10 pm-3:12 pm

1 stop21h 02m

$256

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Thu 3/19

7:30 pm-2:19 pm

1 stop21h 49m

Seattle/Tacoma Intl

Mon 3/23

3:10 pm-3:13 pm

1 stop21h 03m

$257

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Thu 3/19

6:45 am-2:19 pm

2 stops34h 34m

Seattle/Tacoma Intl

Mon 3/23

3:10 pm-3:13 pm

1 stop21h 03m

$265

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sat 5/2

6:45 am-1:08 pm

2 stops33h 23m

Seattle/Tacoma Intl

Sat 5/9

7:05 am-12:40 am

2 stops14h 35m

$267

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Thu 3/19

6:45 am-2:19 pm

2 stops34h 34m

Seattle/Tacoma Intl

Mon 3/23

3:10 pm-12:38 am

2 stops30h 28m

$270

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 1/12

6:45 am-2:20 pm

2 stops34h 35m

Seattle/Tacoma Intl

Mon 1/19

3:10 pm-3:12 pm

1 stop21h 02m

$272

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 $498 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?

No. A direct flight is the cheapest option for a flight between Montreal to Seattle.

How have Montreal to Seattle flight prices changed over time?

As of November 2025, prices for Montreal to Seattle flights are approximately 35% more expensive 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

$833

Fastest flight time

5h 56m

Direct flights

Sat and Sun

Airports in Seattle

1 airport
The best flight deal from Montreal to Seattle found on momondo in the last 72 hours is $833
The fastest flight from Montreal to Seattle takes 5h 56m
Direct flights go from Montreal to Seattle on Saturday and Sunday. The only airline offering direct flights is United Airlines.
There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)
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 8h 51m 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
3,169 reviews
Search WestJet flights
Air CanadaPriceFrom $316Free CancellationRating
7.1
10,463 reviews
Search Air Canada flights
United AirlinesPriceFrom $516Free CancellationRating
7.4
9,028 reviews
Search United Airlines flights

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
Puyallup
Marysville
Redmond
Tukwila
Lakewood
Federal Way
Fife
Cle Elum
Centralia
Kirkland
Westport
Shoreline

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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