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Pierre Elliott Trudeau Intl

$210+ 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 10/7. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YUL
Aug 26 — Sep 21
Wed 8/26
Wed 9/2
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 July 27, 2026.

This American Airlines deal was found by Cheapflights users on 7/22. 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 8/258:07 pm
STL
-
YUL
1 stop14h 36m
American Airlines
Fri 8/285:34 pm
YUL
-
STL
1 stop15h 50m
American Airlines
Deal found 7/22$476
This American Airlines deal was found by Cheapflights users on 7/24. 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.
Sat 10/177:29 am
STL
-
YUL
1 stop8h 23m
American Airlines
Sat 10/2412:30 pm
YUL
-
STL
1 stop12h 28m
American Airlines
Deal found 7/24$485
This American Airlines deal was found by Cheapflights users on 7/24. 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 9/74:50 pm
STL
-
YUL
1 stop17h 53m
American Airlines
Mon 9/145:34 pm
YUL
-
STL
1 stop17h 46m
American Airlines
Deal found 7/24$496
This American Airlines deal was found by Cheapflights users on 7/26. 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.
Sat 10/105:21 pm
STL
-
YUL
1 stop17h 23m
American Airlines
Wed 10/1412:30 pm
YUL
-
STL
1 stop12h 28m
American Airlines
Deal found 7/26$529
This American Airlines deal was found by Cheapflights users on 7/26. 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 9/82:55 pm
STL
-
YUL
1 stop17h 54m
American Airlines
Tue 9/1512:31 pm
YUL
-
STL
1 stop12h 56m
American Airlines
Deal found 7/26$531
This American Airlines deal was found by Cheapflights users on 7/26. 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.
Thu 9/244:37 pm
STL
-
YUL
1 stop16h 12m
American Airlines
Wed 9/3012:31 pm
YUL
-
STL
1 stop12h 56m
American Airlines
Deal found 7/26$537
This American Airlines deal was found by Cheapflights users on 7/23. 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 8/182:55 pm
STL
-
YUL
1 stop17h 51m
American Airlines
Fri 8/215:34 pm
YUL
-
STL
1 stop15h 50m
American Airlines
Deal found 7/23$538
This Kiwi.com deal was found by Cheapflights users on 7/23. 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 8/317:58 pm
STL
-
YUL
2 stops26h 47m
Multiple Airlines
Fri 9/42:46 pm
YUL
-
STL
1 stop10h 12m
Multiple Airlines
Deal found 7/23$563
This American Airlines deal was found by Cheapflights users on 7/25. 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.
Fri 10/24:37 pm
STL
-
YUL
1 stop16h 12m
American Airlines
Tue 10/65:34 pm
YUL
-
STL
1 stop18h 17m
American Airlines
Deal found 7/25$566

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 July 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$476
(American Airlines)

One-way from

$210
(American Airlines)

Popular in

September

Cheapest in

August

Average price

$667

Good round-trip deal

$879 or less

Good one-way deal

$413 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. 2% potential increase in price ($21 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($30 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 July 27, 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

Tue 10/13

8:00 am-10:40 am

1 stop25h 40m

Montreal Pierre Elliott Trudeau Intl

Sat 10/17

9:45 am-9:21 pm

1 stop12h 36m

$592

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 10/1

8:00 am-5:30 pm

1 stop8h 30m

Montreal Pierre Elliott Trudeau Intl

Tue 10/13

1:15 pm-9:21 pm

1 stop9h 06m

$603

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 9/24

6:39 pm-12:25 am

2 stops52h 46m

Montreal Pierre Elliott Trudeau Intl

Wed 9/30

6:47 pm-11:42 pm

1 stop5h 55m

$608

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 12/31

9:37 am-9:01 pm

1 stop10h 24m

Montreal Pierre Elliott Trudeau Intl

Wed 1/6

4:45 pm-8:57 am

1 stop17h 12m

$639

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 10/27

9:00 am-6:50 pm

1 stop8h 50m

Montreal Pierre Elliott Trudeau Intl

Fri 10/30

11:15 am-9:16 pm

2 stops11h 01m

$647

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 9/3

6:25 pm-11:30 pm

1 stop4h 05m

Montreal Pierre Elliott Trudeau Intl

Mon 9/7

7:20 pm-1:10 pm

2 stops42h 50m

$688

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 8/30

12:10 pm-3:42 pm

Nonstop2h 32m

Montreal Pierre Elliott Trudeau Intl

Tue 9/1

6:30 pm-2:57 pm

1 stop21h 27m

$696
Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 10/10

8:00 am-7:01 pm

1 stop10h 01m

Montreal Pierre Elliott Trudeau Intl

Wed 10/14

4:55 pm-6:41 pm

Nonstop2h 46m

$701
Cheapest one-way
Quickest one-way

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 10/7

7:29 am-4:52 pm

1 stop8h 23m

$219

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 8/18

7:25 am-7:03 pm

1 stop10h 38m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/24

Showing 1-10 of 13 resultsSorted by cheapest first
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 July.
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

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

Find hourly flight availability from St. Louis to Pierre Elliott Trudeau Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 27, 2026.

When flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

Airfare is typical for this route at the moment.

St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flights typically cost between $300 and $746 in August.
The cheapest round-trip price found within the last 5 days was $476 on American Airlines (Aug 25-Aug 28).

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 July 27, 2026.
Get a feel of what it's like to fly with United Airlines,American Airlines, andAir Canada 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.
United Airlines
7.4
Good
10,045 reviews

Crew

8.1

Food

6.6

Comfort

7.3

Overall

7.4

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
6.0
Good

Miz,Oct 2024

EWR - YYZ

I booked on United but it was really Air Canada. It was very confusing when I went to the airport. The ride to NY was very turbulent and shaky. The ride back was better. It would be nicer with more leg room and to get rid of the tilting the seat back thing. Fine for an hour flight but any longer would have been not great. Please put subtitles on the programs so we don;t have t use headphones if we forget them.
United Airlines
7.4
Good
10,045 reviews
United Airlines
7.4
Good
10,045 reviews

Crew

8.1

Food

6.6

Comfort

7.3

Overall

7.4

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
6.0
Good

Miz,Oct 2024

EWR - YYZ

I booked on United but it was really Air Canada. It was very confusing when I went to the airport. The ride to NY was very turbulent and shaky. The ride back was better. It would be nicer with more leg room and to get rid of the tilting the seat back thing. Fine for an hour flight but any longer would have been not great. Please put subtitles on the programs so we don;t have t use headphones if we forget them.
American Airlines
7.1
Good
11,837 reviews
United Airlines
7.4
Good
10,045 reviews

Crew

8.1

Food

6.6

Comfort

7.3

Overall

7.4

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
6.0
Good

Miz,Oct 2024

EWR - YYZ

I booked on United but it was really Air Canada. It was very confusing when I went to the airport. The ride to NY was very turbulent and shaky. The ride back was better. It would be nicer with more leg room and to get rid of the tilting the seat back thing. Fine for an hour flight but any longer would have been not great. Please put subtitles on the programs so we don;t have t use headphones if we forget them.
Air Canada
7.1
Good
11,393 reviews
United Airlines
7.4
Good
10,045 reviews

Crew

8.1

Food

6.6

Comfort

7.3

Overall

7.4

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
6.0
Good

Miz,Oct 2024

EWR - YYZ

I booked on United but it was really Air Canada. It was very confusing when I went to the airport. The ride to NY was very turbulent and shaky. The ride back was better. It would be nicer with more leg room and to get rid of the tilting the seat back thing. Fine for an hour flight but any longer would have been not great. Please put subtitles on the programs so we don;t have t use headphones if we forget them.

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 2 outbound flights to Montreal Pierre Elliott Trudeau Intl per day from 3 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 8h 50m. Fly via United Airlines or Delta 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 $257, Air Canada will fly you from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport and back. In addition to Air Canada, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from United Airlines and American Airlines - these airlines can fly you to your destination from $296 and $368, respectively. Air Canada is 62% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the most reliable airlines from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?

    Before booking your flight to Montreal Pierre Elliott Trudeau Intl Airport from St. Louis, check out the most reliable airlines to get you to your destination on time: United Airlines (61%), Air Canada (58%), Jazz( 53%).

  • 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 $333. On average you can expect to pay $3,162. The most popular route, (Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl), can usually be booked for $561.

  • 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
Longueuil
Laval
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 3 airlines flying from St. Louis to Pierre Elliott Trudeau Intl

Discover the top 3 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 July 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$257Average$649FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$296Average$754FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$368Average$709FlexibilityNo cancel feeOn-time71%

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