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Cheap flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport from C$ 216

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 30/10. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YUL
11 Oct — 18 Oct1
1 adult
1 adult, Economy

Cheap 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 11 September 2025.

Round-trip from

C$ 522

One-way from

C$ 216

Popular in

February

Cheapest in

October

Average price

C$ 1,023
American Airlines
  • American Airlines
  • 25/10-1/11
  • 2 total stops
  • 28h 44m total
  • St. Louis to Montreal
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30/10
  • 30/10
  • 2 total stops
  • 36h 46m total
  • St. Louis to Montreal
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Highest demand for flights based on searches. 22% potential increase in price (C$ 356 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease (C$ 51 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 11 September 2025.

Sat 25/104:34 p.m.STL - YUL
1 stop18h 06mAmerican Airlines
Sat 1/1112:30 p.m.YUL - STL
1 stop10h 38mAmerican Airlines
Deal found 10/9C$ 522
Fri 5/129:45 a.m.STL - YUL
2 stops11h 25mMultiple Airlines
Mon 8/124:35 p.m.YUL - STL
1 stop31h 11mMultiple Airlines
Deal found 10/9C$ 567
Sat 4/105:25 p.m.STL - YUL
1 stop17h 21mAmerican Airlines
Tue 7/1012:30 p.m.YUL - STL
1 stop8h 56mAmerican Airlines
Deal found 10/9C$ 570
Sat 6/128:41 a.m.STL - YUL
2 stops13h 01mAmerican Airlines
Tue 9/127:30 a.m.YUL - STL
2 stops13h 54mAmerican Airlines
Deal found 10/9C$ 590
Fri 17/108:05 p.m.STL - YUL
1 stop14h 35mAmerican Airlines
Mon 20/105:24 p.m.YUL - STL
1 stop15h 45mAmerican Airlines
Deal found 10/9C$ 593
Sun 26/1010:57 a.m.STL - YUL
2 stops28h 58mMultiple Airlines
Sun 2/114:35 p.m.YUL - STL
1 stop18h 05mMultiple Airlines
Deal found 11/9C$ 604
Mon 27/106:00 a.m.STL - YUL
1 stop9h 39mAmerican Airlines
Wed 29/107:50 a.m.YUL - STL
2 stops11h 30mAmerican Airlines
Deal found 10/9C$ 606
Sun 26/107:54 p.m.STL - YUL
1 stop14h 46mAmerican Airlines
Sun 2/113:52 p.m.YUL - STL
1 stop17h 17mAmerican Airlines
Deal found 11/9C$ 615

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 629,999 searches. Data last updated 11 September 2025.
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

Sat 25/10

4:34 p.m.-11:40 a.m.

1 stop18h 06m

Montreal Pierre Elliott Trudeau Intl

Sat 1/11

12:30 p.m.-10:08 p.m.

1 stop10h 38m

C$ 522

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 5/12

9:45 a.m.-10:10 p.m.

2 stops11h 25m

Montreal Pierre Elliott Trudeau Intl

Mon 8/12

4:35 p.m.-10:46 p.m.

1 stop31h 11m

C$ 567

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 17/10

8:05 p.m.-11:40 a.m.

1 stop14h 35m

Montreal Pierre Elliott Trudeau Intl

Mon 20/10

5:24 p.m.-8:09 a.m.

1 stop15h 45m

C$ 593

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 3/10

9:32 p.m.-2:20 p.m.

1 stop15h 48m

Montreal Pierre Elliott Trudeau Intl

Sat 11/10

7:20 p.m.-10:37 a.m.

2 stops16h 17m

C$ 594

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 9/11

2:12 p.m.-12:30 a.m.

1 stop9h 18m

Montreal Pierre Elliott Trudeau Intl

Wed 12/11

6:45 a.m.-11:01 a.m.

1 stop29h 16m

C$ 632

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 4/10

7:10 a.m.-7:25 p.m.

2 stops11h 15m

Montreal Pierre Elliott Trudeau Intl

Tue 7/10

9:28 a.m.-8:23 p.m.

2 stops11h 55m

C$ 650

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 10/11

2:12 p.m.-12:30 a.m.

1 stop9h 18m

Montreal Pierre Elliott Trudeau Intl

Sun 16/11

4:35 p.m.-9:40 a.m.

1 stop18h 05m

C$ 658

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 25/10

7:15 p.m.-10:45 p.m.

3 stops26h 30m

Montreal Pierre Elliott Trudeau Intl

Sat 1/11

5:10 p.m.-11:02 a.m.

2 stops18h 52m

C$ 667

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 17/2

6:00 a.m.-6:49 p.m.

1 stop11h 49m

Montreal Pierre Elliott Trudeau Intl

Thu 19/2

7:45 p.m.-3:52 p.m.

1 stop21h 07m

C$ 750

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 30/10

10:57 a.m.-3:10 p.m.

1 stop27h 13m

C$ 224

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/9

Showing 1-10 of 17 results
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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, October is the cheapest month in which you can book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport (average of C$ 241). Flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport in April is currently the most expensive (average of C$ 317). 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 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 11 September 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport as you normally would.

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?

    For a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl, you will be flying from Lambert-St Louis. Lambert-St Louis (STL) is just 20.4 km from the centre of the city. Lambert-St Louis is the only St. Louis airport and it handles 2 outbound flights to Montreal Pierre Elliott Trudeau Intl per day. 0 airlines have flights to Montreal Pierre Elliott Trudeau Intl from Lambert-St Louis on a regular basis.

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

    For as low as C$ 522, American Airlines can have you in Montreal Pierre Elliott Trudeau Intl Airport from St. Louis in 18h 06m. There are 1556 km between St. Louis and Montreal Pierre Elliott Trudeau Intl Airport.

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

    Consider Air Canada (74%), Jazz (74%) or United Airlines (74%) when booking your flight. These represent the most reliable airlines when flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport.

  • 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, October is the cheapest month in which you can book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport (average of C$ 241). Flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport in April is currently the most expensive (average of C$ 317). 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 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
Dorval
Sherbrooke
Cornwall
Brossard
Longueuil
Montebello
Trois-Rivières
Drummondville
Saint-Jean-sur-Richelieu
Boucherville
Bromont
North Hatley
Louiseville

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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.
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