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Pierre Elliott Trudeau Intl

$142+ Cheap flights from St. Louis (STL) to Pierre Elliott Trudeau Intl (YUL)

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 3/11. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YUL
Feb 19 — Feb 261
Thu 2/19
Thu 2/26
1 adult, Economy
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Cheap flight deals from St. Louis to Pierre Elliott Trudeau Intl

Cheapest flights from St. Louis to Pierre Elliott Trudeau Intl
Explore the most affordable flight options available from St. Louis to Pierre Elliott Trudeau Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 20, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/13:49 pm
STL
-
YUL
1 stop7h 41m
Multiple Airlines
Thu 3/56:45 am
YUL
-
STL
2 stops25h 17m
Multiple Airlines
Deal found 1/19$384
This Kiwi.com deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/24:54 pm
STL
-
YUL
1 stop30h 36m
Multiple Airlines
Thu 4/94:35 pm
YUL
-
STL
1 stop16h 16m
Multiple Airlines
Deal found 1/19$417
This Kiwi.com deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/173:49 pm
STL
-
YUL
2 stops31h 49m
Multiple Airlines
Tue 2/244:35 pm
YUL
-
STL
1 stop30h 52m
Multiple Airlines
Deal found 1/20$507
This American Airlines deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/176:00 am
STL
-
YUL
1 stop8h 04m
American Airlines
Fri 2/203:45 pm
YUL
-
STL
1 stop19h 28m
American Airlines
Deal found 1/20$526
This Kiwi.com deal was found by Cheapflights users on 1/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/194:51 pm
STL
-
YUL
2 stops21h 19m
Multiple Airlines
Sun 3/224:35 pm
YUL
-
STL
1 stop15h 27m
Multiple Airlines
Deal found 1/18$562
This United Airlines deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/179:55 am
STL
-
YUL
1 stop7h 45m
United Airlines
Tue 2/244:45 pm
YUL
-
STL
1 stop18h 51m
United Airlines
Deal found 1/20$566
This American Airlines deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/1710:37 am
STL
-
YUL
2 stops11h 19m
American Airlines
Tue 2/2412:59 pm
YUL
-
STL
2 stops11h 49m
American Airlines
Deal found 1/20$575
This Kiwi.com deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/46:00 am
STL
-
YUL
1 stop10h 45m
Multiple Airlines
Mon 2/96:45 am
YUL
-
STL
2 stops40h 42m
Multiple Airlines
Deal found 1/20$585
This Kiwi.com deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/210:16 am
STL
-
YUL
2 stops37h 22m
Multiple Airlines
Sat 2/74:35 pm
YUL
-
STL
1 stop16h 29m
Multiple Airlines
Deal found 1/20$589

Find flight deals from St. Louis to Pierre Elliott Trudeau Intl

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Pierre Elliott Trudeau Intl (YUL). 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 January 20, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$384
(Kiwi.com)

One-way from

$142
(Kiwi.com)

Popular in

February

Cheapest in

July

Average price

$681

Good round-trip deal

$792 or less

Good one-way deal

$442 or less
Provider with most accurate pricing for Lambert-St Louis-Montreal Pierre Elliott Trudeau Intl flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Montreal Pierre Elliott Trudeau Intl flights.
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From Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl
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One-way flight from Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl
Search Deals
Highest demand for flights based on searches. 23% potential increase in price ($216 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 8% potential price decrease ($54 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl.
Search Deals
Price to beat on a one-way flight from Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl.
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Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Pierre Elliott Trudeau Intl 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 2,558,603 searches. Data last updated January 20, 2026.
Use the filters below to find and compare flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport that are best for you.

Fly from

St. Louis

Fly to

Pierre Elliott Trudeau Intl

Route

Depart

Return

Price

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/17

3:49 pm-12:38 am

2 stops31h 49m

Montreal Pierre Elliott Trudeau Intl

Tue 2/24

4:35 pm-10:27 pm

1 stop30h 52m

$507

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/17

6:00 am-3:04 pm

1 stop8h 04m

Montreal Pierre Elliott Trudeau Intl

Fri 2/20

3:45 pm-10:13 am

1 stop19h 28m

$526

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 3/1

3:49 pm-12:30 am

1 stop7h 41m

Montreal Pierre Elliott Trudeau Intl

Thu 3/5

6:00 pm-1:19 pm

1 stop20h 19m

$538

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/17

9:55 am-6:40 pm

1 stop7h 45m

Montreal Pierre Elliott Trudeau Intl

Tue 2/24

4:45 pm-10:36 am

1 stop18h 51m

$566

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/17

10:37 am-10:56 pm

2 stops11h 19m

Montreal Pierre Elliott Trudeau Intl

Tue 2/24

12:59 pm-11:48 pm

2 stops11h 49m

$575

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 2/28

4:05 pm-5:00 pm

2 stops23h 55m

Montreal Pierre Elliott Trudeau Intl

Mon 3/2

6:25 pm-6:36 pm

3 stops25h 11m

$631

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 3/1

6:35 am-6:35 pm

2 stops11h 00m

Montreal Pierre Elliott Trudeau Intl

Thu 3/5

9:29 am-8:41 pm

2 stops12h 12m

$643

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 2/28

5:01 pm-11:45 pm

1 stop5h 44m

Montreal Pierre Elliott Trudeau Intl

Mon 3/2

6:00 pm-9:06 am

1 stop16h 06m

$649

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 2/12

6:55 pm-4:01 pm

1 stop20h 06m

Montreal Pierre Elliott Trudeau Intl

Tue 2/17

1:10 pm-10:36 am

1 stop22h 26m

$677

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 3/11

11:32 am-4:20 pm

2 stops27h 48m

$142

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/20

Showing 1-10 of 17 results
1
2

Compare providers for flights from St. Louis to Pierre Elliott Trudeau Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Pierre Elliott Trudeau Intl in January.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
ExpediaPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-Montreal Pierre Elliott Trudeau Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Montreal Pierre Elliott Trudeau Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Montreal Pierre Elliott Trudeau Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Montreal Pierre Elliott Trudeau Intl Airport flights, Cheapflights users trust Expedia the most. Expedia has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Montreal Pierre Elliott Trudeau Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from St. Louis to Pierre Elliott Trudeau Intl

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

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

Currently, July is the cheapest month in which you can book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport (average of $220). Flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport in February is currently the most expensive (average of $1,289). 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 St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?

Reviews of airlines servicing Pierre Elliott Trudeau Intl

Get insights into the airlines that provide service to Pierre Elliott Trudeau Intl. 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 Pierre Elliott Trudeau Intl. Reviews last updated January 20, 2026.
Get a feel of what it's like to fly with Delta, United Airlines, and American Airlines from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,085 reviews

Overall

7.9

Food

7.2

Crew

8.5

Entertainment

7.8

Comfort

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,085 reviews
Delta
7.9
Good
8,085 reviews

Overall

7.9

Food

7.2

Crew

8.5

Entertainment

7.8

Comfort

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,189 reviews
Delta
7.9
Good
8,085 reviews

Overall

7.9

Food

7.2

Crew

8.5

Entertainment

7.8

Comfort

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
American Airlines
7.2
Good
11,169 reviews
Delta
7.9
Good
8,085 reviews

Overall

7.9

Food

7.2

Crew

8.5

Entertainment

7.8

Comfort

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Air Canada
7.1
Good
10,644 reviews
Delta
7.9
Good
8,085 reviews

Overall

7.9

Food

7.2

Crew

8.5

Entertainment

7.8

Comfort

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Related info for your journey

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

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl. On average, Lambert-St Louis has 0 outbound flights to Montreal Pierre Elliott Trudeau Intl per day from 4 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

  • How long is the flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?

    There are many flights that can get you from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport in 7h 45m. Fly via American Airlines or United Airlines to get the fastest option. There are 967 mi between St. Louis and Montreal Pierre Elliott Trudeau Intl Airport. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Currently priced at $212, Delta will fly you from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from United Airlines and Air Canada - these airlines can fly you to your destination from $246 and $259, respectively. Delta is 69% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?

    The cheapest flight price from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport is $343. On average you can expect to pay $707. The most popular route, (Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl), can usually be booked for $384.

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

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

  • How can I find direct flights from St. Louis to Pierre Elliott Trudeau Intl?

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

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

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

    Currently, July is the cheapest month in which you can book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport (average of $220). Flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport in February is currently the most expensive (average of $1,289). 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

Traveling to a place near Montreal Pierre Elliott Trudeau Intl Airport?

Book flights to Montreal Pierre Elliott Trudeau Intl Airport if you plan to visit one of these locations
Laval
Longueuil
Brossard
Dorval

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Alternative routes for St. Louis to Pierre Elliott Trudeau Intl

See prices for flight routes from nearby airports that may be better suited for you.
Kansas City to Pierre Elliott Trudeau Intl flights
Springfield to Pierre Elliott Trudeau Intl flights
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Joplin to Pierre Elliott Trudeau Intl flights

Top 4 airlines flying from St. Louis to Pierre Elliott Trudeau Intl

Discover the top 4 airlines that operate flights from St. Louis to Pierre Elliott Trudeau Intl. 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 2,558,603 searches. Data last updated January 20, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$212Average$660FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$246Average$613FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$259Average$661FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$348Average$650FlexibilityNo cancel feeOn-time71%

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