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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to Seattle from C$ 266

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 26/9. Fares are subject to change and may not be available on all flights or dates of travel.
YUL — SEA
3 Aug — 10 Aug1
1 adult

Cheapflights Tip: The best prices from Montreal Pierre Elliott Trudeau Intl to Seattle/Tacoma Intl are usually found in August or October, booked 67 days in advance, depart on a Friday or Wednesday and return on a Thursday

Cheap 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 29 July 2025.

Round-trip from

C$ 523

One-way from

C$ 266

Popular in

December

Cheapest in

August

Average price

C$ 680

Good round-trip deal

C$ 577 or less

Good one-way deal

C$ 298 or less
Air Canada
  • Air Canada
  • 23/9-1/10
  • 1 total stop
  • 13h 44m total
  • Montreal to Seattle
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26/9
  • 26/9
  • 2 total stops
  • 25h 07m total
  • Montreal to Seattle
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Highest demand for flights based on searches. 6% potential increase in price (C$ 61 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 24 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Montreal Pierre Elliott Trudeau Intl to Seattle/Tacoma Intl.
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Price to beat on a one-way flight from Montreal Pierre Elliott Trudeau Intl to Seattle/Tacoma Intl.
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Find flight deals from Pierre Elliott Trudeau Intl to Seattle

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 29 July 2025.

Tue 23/94:45 p.m.YUL - SEA
1 stop8h 31mAir Canada
Wed 1/107:15 a.m.SEA - YUL
Nonstop5h 13mAir Canada
Deal found 28/7C$ 523
Tue 2/97:00 a.m.YUL - SEA
1 stop8h 59mWestJet
Fri 5/91:50 p.m.SEA - YUL
1 stop7h 51mWestJet
Deal found 29/7C$ 525
Fri 12/96:45 a.m.YUL - SEA
2 stops13h 48mMultiple Airlines
Sun 28/98:40 a.m.SEA - YUL
1 stop26h 30mMultiple Airlines
Deal found 29/7C$ 539
Sat 4/107:25 a.m.YUL - SEA
1 stop10h 53mAmerican Airlines
Fri 7/1112:59 a.m.SEA - YUL
2 stops11h 21mAmerican Airlines
Deal found 27/7C$ 542
Wed 10/96:15 a.m.YUL - SEA
2 stops15h 34mUnited Airlines
Wed 17/97:10 a.m.SEA - YUL
2 stops11h 56mUnited Airlines
Deal found 29/7C$ 561
Wed 10/96:00 a.m.YUL - SEA
2 stops11h 45mDelta
Wed 17/97:25 a.m.SEA - YUL
2 stops12h 53mDelta
Deal found 27/7C$ 573

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 29 July 2025.
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

Pierre Elliott Trudeau Intl

Fly to

Seattle

Route

Depart

Return

Price

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Tue 23/9

4:45 p.m.-10:16 p.m.

1 stop8h 31m

Seattle/Tacoma Intl

Wed 1/10

7:15 a.m.-3:28 p.m.

Nonstop5h 13m

C$ 523

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Tue 2/9

7:00 a.m.-12:59 p.m.

1 stop8h 59m

Seattle/Tacoma Intl

Fri 5/9

1:50 p.m.-12:41 a.m.

1 stop7h 51m

C$ 525

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Fri 12/9

6:45 a.m.-5:33 p.m.

2 stops13h 48m

Seattle/Tacoma Intl

Sun 28/9

8:40 a.m.-2:10 p.m.

1 stop26h 30m

C$ 539

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Sat 4/10

7:25 a.m.-3:18 p.m.

1 stop10h 53m

Seattle/Tacoma Intl

Fri 7/11

12:59 a.m.-3:20 p.m.

2 stops11h 21m

C$ 542

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Wed 10/9

6:15 a.m.-6:49 p.m.

2 stops15h 34m

Seattle/Tacoma Intl

Wed 17/9

7:10 a.m.-10:06 p.m.

2 stops11h 56m

C$ 561

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Wed 10/9

6:00 a.m.-2:45 p.m.

2 stops11h 45m

Seattle/Tacoma Intl

Wed 17/9

7:25 a.m.-11:18 p.m.

2 stops12h 53m

C$ 573

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Fri 26/9

10:45 a.m.-8:52 a.m.

2 stops25h 07m

C$ 266

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Fri 26/9

7:00 a.m.-12:59 p.m.

1 stop8h 59m

C$ 269

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Fri 29/8

5:45 p.m.-8:45 p.m.

Nonstop6h 00m

C$ 285

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

Mon 4/8

8:00 a.m.-10:50 p.m.

1 stop17h 50m

C$ 409

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/7

Showing 1-10 of 11 results
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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?

Use this chart to determine the optimal time to book a round-trip flight from Pierre Elliott Trudeau Intl to Seattle. Price data was last updated on 25 July 2025.

The best time to book flights from Montreal Pierre Elliott Trudeau Intl Airport to Seattle is 67 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, January is the cheapest month in which you can book a flight from Montreal Pierre Elliott Trudeau Intl Airport to Seattle (average of C$ 262). Flying from Montreal Pierre Elliott Trudeau Intl Airport to Seattle in December is currently the most expensive (average of C$ 353). 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.

What is the cheapest time of day to fly from YUL to SEA?

Find hourly flight availability from Pierre Elliott Trudeau Intl to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 29 July 2025.

It’s typically best to fly out from Montreal Pierre Elliott Trudeau Intl Airport to Seattle in the evening. Doing so could potentially save you 53% on the flight price compared to flying at noon, which is usually more expensive.

How much does it cost to fly round-trip from Montreal Pierre Elliott Trudeau Intl Airport to Seattle?

What’s the top layover airport for flights from Montreal Pierre Elliott Trudeau Intl Airport to Seattle?

Share of one-stop round-trip flights from Montreal Pierre Elliott Trudeau Intl Airport to Seattle chosen by Cheapflights users in the past 12 months, using the same layover each way.

Calgary (YYC) – chosen by Cheapflights users on 44% of one-stop itineraries from Montreal Pierre Elliott Trudeau Intl Airport to Seattle on Cheapflights.

What’s the cheapest layover airport for flights from Montreal Pierre Elliott Trudeau Intl Airport to Seattle?

Average round-trip fare for 1-stop flights from Montreal Pierre Elliott Trudeau Intl Airport to Seattle, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Calgary (YYC) is the most affordable 1-stop option, with an average round-trip price of C$ 563.

What’s the fastest layover option from Montreal Pierre Elliott Trudeau Intl Airport to Seattle?

Shortest average travel time for 1-stop one-way flights from Montreal Pierre Elliott Trudeau Intl Airport to Seattle, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Vancouver (YVR) have the shortest average one-way travel time for 1-stop routes: 3h 09m.

Which airport typically offers the quickest layover for flights from Montreal Pierre Elliott Trudeau Intl Airport to Seattle?

Average layover duration for 1-stop one-way flights from Montreal Pierre Elliott Trudeau Intl Airport to Seattle, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Chicago (ORD) offer the fastest connection on this route, with an average layover time of 1h 19m.

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 29 July 2025.
See what other customers who have flown with Delta,United Airlines, andAmerican Airlines 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
8.0
Very good
7,979 reviews
Check prices

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Delta
8.0
Very good
7,979 reviews
Delta
8.0
Very good
7,979 reviews
Check prices

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
United Airlines
7.4
Good
8,896 reviews
Delta
8.0
Very good
7,979 reviews
Check prices

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,979 reviews
Check prices

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
WestJet
7.2
Good
2,972 reviews
Delta
8.0
Very good
7,979 reviews
Check prices

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Air Canada
7.1
Good
9,826 reviews
Delta
8.0
Very good
7,979 reviews
Check prices

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

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 1 inbound flight from Montreal Pierre Elliott Trudeau Intl per day. 5 airlines have flights to Seattle/Tacoma Intl from Montreal Pierre Elliott Trudeau Intl on a regular basis.

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

    Flying on Air Canada is currently your cheapest option to Seattle, with prices starting at C$ 523. Additional round-trip tickets that might be worth considering are offered by WestJet and American Airlines, with the lowest prices starting at C$ 525 and C$ 542, respectively. Air Canada is 24% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Montreal Pierre Elliott Trudeau Intl Airport to Seattle one-way?

    For one-way options, check prices for WestJet. According to our data, you can fly for as low as C$ 269. Users have also found prices from C$ 285 and C$ 409 on Air Canada and Sun Country Air, respectively.

  • What are the cheapest flights from Montreal Pierre Elliott Trudeau Intl Airport to Seattle?

    Looking for the cheapest flight from Montreal Pierre Elliott Trudeau Intl Airport to Seattle? While on average our users pay C$ 441, our data indicates the cheapest price to be C$ 298. The most popular route (Montreal Pierre Elliott Trudeau Intl - Seattle/Tacoma Intl), is priced around C$ 483.

  • 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, January is the cheapest month in which you can book a flight from Montreal Pierre Elliott Trudeau Intl Airport to Seattle (average of C$ 262). Flying from Montreal Pierre Elliott Trudeau Intl Airport to Seattle in December is currently the most expensive (average of C$ 353). 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
Leavenworth
SeaTac
Tukwila
Tacoma
Marysville
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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
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Top 5 airlines flying from Pierre Elliott Trudeau Intl to Seattle

Discover the top 5 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 29 July 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 365AverageC$ 562FlexibilityNo cancel feeOn-time60%
Search WestJet flights
DeltaCheapestC$ 493AverageC$ 623FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air CanadaCheapestC$ 505AverageC$ 704FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapestC$ 526AverageC$ 694FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapestC$ 531AverageC$ 723FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

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How does Cheapflights help users find flights from Pierre Elliott Trudeau Intl to Seattle?

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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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