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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to Seattle from C$ 280

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 18/9. Fares are subject to change and may not be available on all flights or dates of travel.
YUL — SEA
14 Jul — 21 Jul1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Montreal Pierre Elliott Trudeau Intl to Seattle/Tacoma Intl are usually found in February or April, booked 81 days in advance, depart on a Wednesday or Friday and return on a Thursday

Cheap flight deals from Pierre Elliott Trudeau Intl to Seattle

Enter your travel dates to find the best prices.

Cheapest flights from Pierre Elliott Trudeau Intl to Seattle
Explore the most affordable flight options available from Pierre Elliott Trudeau Intl to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 14 June 2026.

Fri 11/96:00 p.m.
YUL
-
SEA
1 stop7h 42m
Air Canada
Tue 15/98:00 a.m.
SEA
-
YUL
1 stop7h 52m
Air Canada
Deal found 8/6C$ 449
Fri 25/96:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Fri 2/107:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Deal found 13/6C$ 470
Fri 18/96:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Sun 27/97:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Deal found 9/6C$ 473
Thu 16/76:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Sun 19/77:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Deal found 9/6C$ 474
Tue 14/76:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Tue 28/77:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Deal found 9/6C$ 476
Fri 4/96:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Mon 7/97:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Deal found 13/6C$ 478
Mon 7/96:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Thu 17/97:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Deal found 11/6C$ 480
Sun 6/96:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Tue 15/910:30 a.m.
SEA
-
YUL
2 stops10h 55m
WestJet
Deal found 13/6C$ 485
Sun 6/96:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Thu 17/910:30 a.m.
SEA
-
YUL
2 stops10h 55m
WestJet
Deal found 11/6C$ 488

Find flight deals from Pierre Elliott Trudeau Intl to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Pierre Elliott Trudeau Intl (YUL) to Seattle (SEA). 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 14 June 2026.

Round-trip from

C$ 470

One-way from

C$ 280

Popular in

June

Cheapest in

February

Average price

C$ 856
WestJet
  • WestJet
  • 25/9-2/10
  • 3 total stops
  • 23h 30m total
  • Montreal to Seattle
Search Deals
WestJet
  • WestJet
  • 18/9
  • 2 total stops
  • 15h 00m total
  • Montreal to Seattle
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (C$ 118 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 22 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 Pierre Elliott Trudeau Intl 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, Cheapflights users made 629,999 searches. Data last updated 14 June 2026.
Use the filters below to find and compare flights from Montreal Pierre Elliott Trudeau Intl Airport to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Fri 4/9

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

2 stops15h 00m

Seattle/Tacoma Intl

Mon 7/9

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

1 stop8h 30m

C$ 478

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 14/9

8:20 a.m.-9:51 p.m.

1 stop16h 31m

Seattle/Tacoma Intl

Mon 14/9

11:59 p.m.-2:50 p.m.

1 stop11h 51m

C$ 529

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sat 29/8

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

1 stop12h 00m

Seattle/Tacoma Intl

Sun 6/9

9:53 a.m.-11:30 p.m.

1 stop10h 37m

C$ 533

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Thu 29/10

6:00 a.m.-2:23 p.m.

1 stop11h 23m

Seattle/Tacoma Intl

Tue 3/11

1:45 p.m.-11:37 p.m.

1 stop6h 52m

C$ 534

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Wed 28/10

6:00 a.m.-2:23 p.m.

1 stop11h 23m

Seattle/Tacoma Intl

Sun 1/11

1:45 p.m.-11:37 p.m.

1 stop6h 52m

C$ 534
Quickest round-trip

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Tue 27/10

4:55 p.m.-10:05 p.m.

1 stop8h 10m

Seattle/Tacoma Intl

Fri 6/11

1:45 p.m.-11:37 p.m.

1 stop6h 52m

C$ 534

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Wed 23/9

9:15 a.m.-3:43 p.m.

1 stop9h 28m

Seattle/Tacoma Intl

Sun 27/9

11:13 p.m.-10:40 a.m.

1 stop8h 27m

C$ 536

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 14/9

8:20 a.m.-9:51 p.m.

1 stop16h 31m

Seattle/Tacoma Intl

Tue 15/9

5:00 a.m.-3:29 p.m.

1 stop7h 29m

C$ 537

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Thu 10/9

1:10 p.m.-11:04 p.m.

2 stops12h 54m

Seattle/Tacoma Intl

Wed 16/9

5:00 a.m.-3:29 p.m.

1 stop7h 29m

C$ 537

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Thu 20/8

12:44 p.m.-11:57 p.m.

1 stop14h 13m

Seattle/Tacoma Intl

Fri 28/8

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

1 stop11h 41m

C$ 537

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/6

Showing 1-10 of 22 resultsSorted by cheapest first
1
2
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Best time to book a flight from Pierre Elliott Trudeau Intl to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Pierre Elliott Trudeau Intl 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 Montreal Pierre Elliott Trudeau Intl Airport to Seattle

How far ahead should I book a flight from Montreal Pierre Elliott Trudeau Intl Airport to Seattle?

The best time to book flights from Montreal Pierre Elliott Trudeau Intl Airport to Seattle is 80 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Montreal Pierre Elliott Trudeau Intl Airport to Seattle?

Currently, February is the cheapest month in which you can book a flight from Montreal Pierre Elliott Trudeau Intl Airport to Seattle (average of C$ 583). Flying from Montreal Pierre Elliott Trudeau Intl Airport to Seattle in June is currently the most expensive (average of C$ 797). 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 Montreal Pierre Elliott Trudeau Intl Airport to Seattle?

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated 14 June 2026.
See what other customers who have flown with Delta,United Airlines, andWestJet from Montreal Pierre Elliott Trudeau Intl Airport to Seattle have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,405 reviews
Check prices

Entertainment

7.8

Crew

8.5

Food

7.2

Boarding

8.1

Overall

7.9

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
Delta
7.9
Good
8,405 reviews
Delta
7.9
Good
8,405 reviews
Check prices

Entertainment

7.8

Crew

8.5

Food

7.2

Boarding

8.1

Overall

7.9

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
United Airlines
7.4
Good
9,820 reviews
Delta
7.9
Good
8,405 reviews
Check prices

Entertainment

7.8

Crew

8.5

Food

7.2

Boarding

8.1

Overall

7.9

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
WestJet
7.2
Good
3,360 reviews
Delta
7.9
Good
8,405 reviews
Check prices

Entertainment

7.8

Crew

8.5

Food

7.2

Boarding

8.1

Overall

7.9

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,
Air Canada
7.1
Good
11,175 reviews
Delta
7.9
Good
8,405 reviews
Check prices

Entertainment

7.8

Crew

8.5

Food

7.2

Boarding

8.1

Overall

7.9

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Rakshith,May 2026

TPE - SEA

I got middle seat, but it was cheap $340 for Taipei to PDX ,

Related info for your journey

Find useful and relevant information for your journey from Pierre Elliott Trudeau Intl to Seattle. 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 into for flights to Seattle from Montreal Pierre Elliott Trudeau Intl?

    For a flight from Montreal Pierre Elliott Trudeau Intl to Seattle, you will be flying into Seattle/Tacoma Intl. Seattle/Tacoma Intl (SEA) is just 18.4 km from the centre of the city. Seattle/Tacoma Intl is the only Seattle airport and it handles 0 inbound flights from Montreal Pierre Elliott Trudeau Intl per day. 4 airlines have flights to Seattle/Tacoma Intl from Montreal Pierre Elliott Trudeau Intl on a regular basis.

  • How long is the flight from Montreal Pierre Elliott Trudeau Intl Airport to Seattle?

    There are many flights that can get you from Montreal Pierre Elliott Trudeau Intl Airport to Seattle in 12h. Fly via WestJet, United Airlines, or Delta to get the fastest option. The distance between Montreal Pierre Elliott Trudeau Intl Airport and Seattle is about 3663 km. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Montreal Pierre Elliott Trudeau Intl Airport to Seattle round-trip?

    Flying on Delta is currently your cheapest option to Seattle, with prices starting at C$ 284. Additional round-trip tickets that might be worth considering are offered by WestJet and United Airlines, with the lowest prices starting at C$ 414 and C$ 503, respectively. Delta is 59% cheaper than the average price of flights available within the next 90 days to this destination.

  • Can I find deals for flights from Pierre Elliott Trudeau Intl to Seattle that include hotel bookings?

    Yes. In addition to deals on Pierre Elliott Trudeau Intl to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Pierre Elliott Trudeau Intl to Seattle?

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

  • Can I find deals for business class flights from Pierre Elliott Trudeau Intl to Seattle?

    Yes. Cheapflights offers flight deals from Pierre Elliott Trudeau Intl to Seattle 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 Montreal Pierre Elliott Trudeau Intl Airport to Seattle?

    Currently, February is the cheapest month in which you can book a flight from Montreal Pierre Elliott Trudeau Intl Airport to Seattle (average of C$ 583). Flying from Montreal Pierre Elliott Trudeau Intl Airport to Seattle in June is currently the most expensive (average of C$ 797). 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

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Kent
Leavenworth
Mukilteo
Tacoma
Renton
Cashmere
Tukwila
Olympia
Marysville
Kirkland

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Alternative routes for Pierre Elliott Trudeau Intl to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
Pierre Elliott Trudeau Intl to Portland flights
Pierre Elliott Trudeau Intl to Spokane flights
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Top 4 airlines flying from Pierre Elliott Trudeau Intl to Seattle

Discover the top 4 airlines that operate flights from Pierre Elliott Trudeau Intl to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 14 June 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 284AverageC$ 674FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
WestJetCheapestC$ 414AverageC$ 526FlexibilityNo cancel feeOn-time60%
Search WestJet flights
United AirlinesCheapestC$ 503AverageC$ 930FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 532AverageC$ 715FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

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Can Cheapflights find flights from Pierre Elliott Trudeau Intl to Seattle with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Pierre Elliott Trudeau Intl to Seattle flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Pierre Elliott Trudeau Intl to Seattle become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Seattle from Pierre Elliott Trudeau Intl today and book when prices fit your budget.

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