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Cheap flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport from C$ 267

STL — YUL
12 Oct — 19 Oct1
1 adult
1 adult, Economy, 0 bags

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

Enter your travel dates to find the best prices.

Cheapest flights from St. Louis to Pierre Elliott Trudeau Intl

Sat 24/107:28 a.m. -
1 stop8h 24m
Sat 31/1012:30 p.m. -
1 stop9h 43m
Deal found 9/9C$ 625
Sat 17/105:23 p.m. -
1 stop17h 21m
Wed 21/105:34 p.m. -
1 stop18h 16m
Deal found 10/9C$ 635
Sat 7/118:15 p.m. -
1 stop14h 10m
Wed 11/1112:10 p.m. -
1 stop12h 49m
Deal found 7/9C$ 673
Sat 3/105:18 p.m. -
1 stop17h 26m
Mon 5/1012:30 p.m. -
1 stop12h 49m
Deal found 9/9C$ 707
Fri 2/107:21 a.m. -
1 stop8h 32m
Tue 6/105:34 p.m. -
1 stop18h 16m
Deal found 8/9C$ 744
Tue 6/104:18 p.m. -
1 stop16h 34m
Tue 13/105:34 p.m. -
1 stop18h 16m
Deal found 10/9C$ 774
Thu 29/105:00 a.m. -
1 stop10h 52m
Mon 2/1112:10 p.m. -
1 stop12h 49m
Deal found 9/9C$ 779
Thu 8/102:00 p.m. -
3 stops30h 12m
Mon 12/108:35 a.m. -
2 stops6h 25m
Deal found 9/9C$ 799

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

Round-trip from

C$ 625

One-way from

C$ 267

Popular in

October

Cheapest in

August

Average price

C$ 1,075

Good one-way deal

C$ 876 or less
American Airlines
  • American Airlines
  • 24/10-31/10
  • 2 total stops
  • 18h 07m total
  • St. Louis to Montreal
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19/10-31/12
  • 19/10-31/12
  • 3 total stops
  • 22h 45m total
  • St. Louis to Montreal
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Highest demand for flights based on searches. 12% potential increase in price (C$ 191 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 39 potential savings vs. average RT price).
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Average for round-trip flights in September 2026
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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

 
Use the filters below to find and compare flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport that are best for you.

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Route

Depart

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Price

Cheapest round-trip

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Thu 1/10

2:00 p.m.-6:12 p.m.

3 stops27h 12m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 351

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Mon 19/10

5:31 p.m.-8:32 a.m.

1 stop14h 01m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 373

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Tue 27/10

5:00 a.m.-4:52 p.m.

1 stop10h 52m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 374

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Wed 7/10

6:47 a.m.-6:58 p.m.

2 stops11h 11m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 380

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Tue 27/10

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

3 stops25h 50m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 385

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Wed 7/10

8:00 a.m.-7:01 p.m.

1 stop10h 01m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 393

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Fri 16/10

5:31 p.m.-8:32 a.m.

1 stop14h 01m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 395

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Fri 25/9

5:19 p.m.-2:08 p.m.

2 stops19h 49m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 417
Quickest round-trip

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Fri 25/9

8:55 a.m.-5:54 p.m.

1 stop7h 59m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 427

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Wed 7/10

4:18 p.m.-9:52 a.m.

1 stop16h 34m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 450

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/9

Showing 1-10 of 19 resultsSorted by cheapest first
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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

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?

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.

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

Airfare is below average for this route at the moment.

St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flights typically cost between C$ 1,004 and C$ 1,919 in October.
The cheapest round-trip price found within the last 5 days was C$ 625 on American Airlines (24 Oct-31 Oct).

Related info for your journey

  • 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$ 903, United Airlines can have you in Montreal Pierre Elliott Trudeau Intl Airport from St. Louis in 20h 09m. 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.

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

    While on average a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport is generally C$ 876, our data shows the cheapest flight currently is C$ 641. When looking at the most popular route, (Lambert-St Louis - Montreal Pierre Elliott Trudeau Intl), you can expect to pay C$ 817 for that flight.

  • 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

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
Trois-Rivières
Brossard
Sherbrooke
Longueuil
Cornwall
Boucherville
Bromont
Magog
Montebello
Saint-Jean-sur-Richelieu
Drummondville
North Hatley
Saint-Sauveur
Louiseville

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for St. Louis to Pierre Elliott Trudeau Intl

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