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Pierre Elliott Trudeau Intl

$129+ 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 3/31. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YUL
Apr 9 — Apr 161
Thu 4/9
Thu 4/16
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 March 10, 2026.

This Kiwi.com deal was found by Cheapflights users on 3/6. 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 4/204:59 pm
STL
-
YUL
1 stop30h 31m
Multiple Airlines
Mon 4/278:00 am
YUL
-
STL
2 stops47h 50m
Multiple Airlines
Deal found 3/6$366
This American Airlines deal was found by Cheapflights users on 3/7. 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.
Mon 5/118:03 pm
STL
-
YUL
1 stop14h 41m
American Airlines
Sat 5/1612:30 pm
YUL
-
STL
1 stop10h 49m
American Airlines
Deal found 3/7$387
This American Airlines deal was found by Cheapflights users on 3/6. 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.
Mon 4/205:21 pm
STL
-
YUL
1 stop17h 23m
American Airlines
Mon 4/2712:30 pm
YUL
-
STL
1 stop12h 16m
American Airlines
Deal found 3/6$401
This American Airlines deal was found by Cheapflights users on 3/7. 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 4/214:30 pm
STL
-
YUL
1 stop18h 14m
American Airlines
Tue 4/281:03 pm
YUL
-
STL
2 stops11h 43m
American Airlines
Deal found 3/7$411
This flygcity.se deal was found by Cheapflights users on 3/8. 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 flygcity.se is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/27:45 am
STL
-
YUL
1 stop8h 45m
Air Canada
Mon 5/46:30 pm
YUL
-
STL
Nonstop2h 55m
Air Canada
Deal found 3/8$465
This United Airlines deal was found by Cheapflights users on 3/5. 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.
Mon 3/308:21 am
STL
-
YUL
1 stop8h 09m
United Airlines
Tue 3/319:45 am
YUL
-
STL
1 stop12h 23m
United Airlines
Deal found 3/5$467

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 March 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$366
(Kiwi.com)

One-way from

$129
(American Airlines)

Popular in

September

Cheapest in

July

Average price

$750

Good round-trip deal

$857 or less

Good one-way deal

$383 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
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Highest demand for flights based on searches. 4% potential increase in price ($27 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in March 2026
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Price to beat on a round-trip flight from Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl.
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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 March 10, 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

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 3/30

6:30 am-5:58 pm

2 stops10h 28m

Montreal Pierre Elliott Trudeau Intl

Tue 3/31

1:20 pm-9:47 pm

1 stop9h 27m

$477

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 4/30

11:21 am-12:45 am

2 stops12h 24m

Montreal Pierre Elliott Trudeau Intl

Sun 5/3

4:35 pm-11:19 pm

1 stop7h 44m

$488

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 4/21

6:30 am-6:56 pm

1 stop11h 26m

Montreal Pierre Elliott Trudeau Intl

Sat 4/25

1:20 pm-9:52 pm

1 stop9h 32m

$501

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 5/13

7:45 am-9:26 pm

1 stop12h 41m

Montreal Pierre Elliott Trudeau Intl

Sun 5/17

6:10 am-9:13 pm

1 stop16h 03m

$561

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 4/2

6:00 am-2:58 pm

1 stop7h 58m

Montreal Pierre Elliott Trudeau Intl

Sun 4/5

12:59 pm-11:44 pm

2 stops11h 45m

$562
Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 3/23

7:00 am-1:28 pm

1 stop5h 28m

Montreal Pierre Elliott Trudeau Intl

Fri 3/27

6:00 am-10:36 am

1 stop5h 36m

$577

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 5/12

10:25 am-7:04 pm

1 stop7h 39m

Montreal Pierre Elliott Trudeau Intl

Wed 5/13

9:45 am-9:13 pm

1 stop12h 28m

$582

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 5/11

1:00 pm-4:35 pm

Nonstop2h 35m

Montreal Pierre Elliott Trudeau Intl

Sat 5/16

6:10 am-10:45 pm

1 stop17h 35m

$590

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 5/13

7:45 am-9:26 pm

1 stop12h 41m

Montreal Pierre Elliott Trudeau Intl

Sat 5/16

1:05 pm-9:13 pm

2 stops9h 08m

$592

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 5/26

10:20 am-9:26 pm

1 stop10h 06m

Montreal Pierre Elliott Trudeau Intl

Mon 6/1

6:30 pm-8:25 pm

Nonstop2h 55m

$598

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/5

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

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 March.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy1 starTrust 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 FlightHub the most. FlightHub 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

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 March 10, 2026.
Get a feel of what it's like to fly with Delta,United Airlines, andAmerican 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
8,276 reviews

Comfort

7.9

Overall

7.9

Boarding

8.1

Entertainment

7.8

Food

7.2

Crew

8.5

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
8,276 reviews
Delta
7.9
Good
8,276 reviews

Comfort

7.9

Overall

7.9

Boarding

8.1

Entertainment

7.8

Food

7.2

Crew

8.5

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
9,409 reviews
Delta
7.9
Good
8,276 reviews

Comfort

7.9

Overall

7.9

Boarding

8.1

Entertainment

7.8

Food

7.2

Crew

8.5

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
7.1
Good
11,414 reviews
Delta
7.9
Good
8,276 reviews

Comfort

7.9

Overall

7.9

Boarding

8.1

Entertainment

7.8

Food

7.2

Crew

8.5

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
10,800 reviews
Delta
7.9
Good
8,276 reviews

Comfort

7.9

Overall

7.9

Boarding

8.1

Entertainment

7.8

Food

7.2

Crew

8.5

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 10h 28m. Fly via United Airlines to get the fastest option. There are 967 mi between St. Louis and Montreal Pierre Elliott Trudeau Intl Airport.

  • 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 $239 and $318, respectively. Delta is 67% 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 $230. On average you can expect to pay $771. The most popular route, (Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl), can usually be booked for $418.

  • 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.

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
Columbia 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 March 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$212Average$634FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$239Average$765FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$318Average$661FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$348Average$650FlexibilityNo cancel feeOn-time71%

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