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Cheap flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport from C$ 252

STL — YUL
24 Nov — 1 Dec1
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

Tue 8/128:24 p.m. -
1 stop14h 04m
Tue 15/1212:08 p.m. -
1 stop8h 50m
Deal found 23/10C$ 587
Sat 5/125:23 p.m. -
1 stop17h 05m
Sat 12/1212:08 p.m. -
1 stop8h 49m
Deal found 21/10C$ 641
Tue 10/115:29 p.m. -
1 stop16h 56m
Mon 16/111:04 p.m. -
2 stops11h 55m
Deal found 22/10C$ 655
Tue 10/115:29 p.m. -
1 stop16h 56m
Thu 12/1112:10 p.m. -
1 stop12h 49m
Deal found 20/10C$ 693
Fri 27/118:12 p.m. -
1 stop14h 14m
Tue 1/1212:10 p.m. -
1 stop12h 51m
Deal found 24/10C$ 711
Sat 21/113:04 p.m. -
3 stops27h 01m
Mon 23/119:45 a.m. -
3 stops23h 09m
Deal found 25/10C$ 720

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

Round-trip from

C$ 555

One-way from

C$ 252

Popular in

October

Cheapest in

August

Average price

C$ 1,217
American Airlines
  • American Airlines
  • 3/2-6/2
  • 2 total stops
  • 25h 36m total
  • St. Louis to Montreal
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American Airlines
  • American Airlines
  • 13/11-31/12
  • 1 total stop
  • 14h 10m total
  • St. Louis to Montreal
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (C$ 195 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease (C$ 42 potential savings vs. average RT price).
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Average for round-trip flights in October 2026
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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.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisMontreal

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

STLYUL

Lambert-St Louis

Wed 2/12

12:05 p.m.-4:00 p.m.

3 stops26h 55m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

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

Nonstop0h 00m

C$ 279

St. LouisMontreal

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

STLYUL

Lambert-St Louis

Sun 6/12

8:24 p.m.-11:28 a.m.

1 stop14h 04m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

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

Nonstop0h 00m

C$ 294

St. LouisMontreal

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

STLYUL

Lambert-St Louis

Tue 1/12

8:12 p.m.-11:28 a.m.

1 stop14h 16m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

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

Nonstop0h 00m

C$ 315

St. LouisMontreal

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

STLYUL

Lambert-St Louis

Tue 1/12

6:13 p.m.-4:00 p.m.

3 stops44h 47m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

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

Nonstop0h 00m

C$ 335

St. LouisMontreal

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

STLYUL

Lambert-St Louis

Sun 6/12

2:00 p.m.-10:11 p.m.

3 stops31h 11m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

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

Nonstop0h 00m

C$ 367
Quickest round-trip

St. LouisMontreal

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

STLYUL

Lambert-St Louis

Thu 24/12

8:05 a.m.-5:07 p.m.

1 stop8h 02m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

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

Nonstop0h 00m

C$ 370

St. LouisMontreal

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

STLYUL

Lambert-St Louis

Sun 6/12

6:05 p.m.-8:48 a.m.

2 stops13h 43m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

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

Nonstop0h 00m

C$ 410

St. LouisMontreal

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

STLYUL

Lambert-St Louis

Fri 13/11

1:28 p.m.-10:17 p.m.

2 stops31h 49m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

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

Nonstop0h 00m

C$ 422

St. LouisMontreal

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

STLYUL

Lambert-St Louis

Thu 24/12

9:15 a.m.-9:32 p.m.

2 stops11h 17m

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

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

Nonstop0h 00m

C$ 424

St. LouisMontreal

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

STLYUL

Lambert-St Louis

Wed 3/2

8:15 p.m.-11:30 a.m.

1 stop14h 15m

Montreal Pierre Elliott Trudeau Intl

Sat 6/2

12:10 p.m.-10:31 p.m.

1 stop11h 21m

C$ 555

Flights are sorted by cheapest round-trip flights first.

Deals found on 23/10

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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$ 742 and C$ 1,210 in February.
The cheapest round-trip price found within the last 5 days was C$ 555 on American Airlines (3 Feb-6 Feb).

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 0 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$ 555, American Airlines can have you in Montreal Pierre Elliott Trudeau Intl Airport from St. Louis in 14h 15m. 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 (85%), Jazz (85%) or United Airlines (85%) 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.

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
Trois-Rivières
Dorval
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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Joplin to Pierre Elliott Trudeau Intl flights

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