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Cheap flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport from C$ 234

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 11/5. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YUL
13 Apr — 20 Apr1
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
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 14 March 2026.

Wed 8/48:03 p.m.
STL
-
YUL
1 stop14h 41m
American Airlines
Wed 15/412:30 p.m.
YUL
-
STL
1 stop10h 47m
American Airlines
Deal found 10/3C$ 524
Sat 11/48:03 p.m.
STL
-
YUL
1 stop14h 41m
American Airlines
Sat 18/412:30 p.m.
YUL
-
STL
1 stop12h 16m
American Airlines
Deal found 12/3C$ 549
Mon 27/45:21 p.m.
STL
-
YUL
1 stop17h 23m
American Airlines
Mon 4/512:30 p.m.
YUL
-
STL
1 stop10h 47m
American Airlines
Deal found 13/3C$ 577
Sat 23/58:02 p.m.
STL
-
YUL
1 stop14h 42m
American Airlines
Tue 26/512:30 p.m.
YUL
-
STL
1 stop12h 24m
American Airlines
Deal found 11/3C$ 579
Sat 25/48:03 p.m.
STL
-
YUL
1 stop14h 41m
American Airlines
Sat 2/512:30 p.m.
YUL
-
STL
1 stop8h 39m
American Airlines
Deal found 11/3C$ 606
Thu 30/411:21 a.m.
STL
-
YUL
2 stops12h 24m
Multiple Airlines
Sat 2/54:35 p.m.
YUL
-
STL
1 stop7h 44m
Multiple Airlines
Deal found 11/3C$ 618

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 14 March 2026.

Round-trip from

C$ 524

One-way from

C$ 234

Popular in

September

Cheapest in

July

Average price

C$ 1,026
American Airlines
  • American Airlines
  • 8/4-15/4
  • 2 total stops
  • 25h 28m total
  • St. Louis to Montreal
Search Deals
American Airlines
  • American Airlines
  • 11/5
  • 1 total stop
  • 14h 41m total
  • St. Louis to Montreal
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (C$ 52 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
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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 629,999 searches. Data last updated 14 March 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

Sat 11/4

2:33 p.m.-11:44 a.m.

1 stop20h 11m

Montreal Pierre Elliott Trudeau Intl

Sat 18/4

1:03 p.m.-11:46 p.m.

2 stops11h 43m

C$ 562

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 21/4

7:45 a.m.-6:56 p.m.

1 stop10h 11m

Montreal Pierre Elliott Trudeau Intl

Sat 25/4

1:20 p.m.-9:52 p.m.

1 stop9h 32m

C$ 654

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 12/5

10:25 a.m.-7:04 p.m.

1 stop7h 39m

Montreal Pierre Elliott Trudeau Intl

Wed 13/5

9:45 a.m.-9:13 p.m.

1 stop12h 28m

C$ 796

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 14/5

1:00 p.m.-4:35 p.m.

Nonstop2h 35m

Montreal Pierre Elliott Trudeau Intl

Sat 16/5

6:10 a.m.-11:19 p.m.

1 stop18h 09m

C$ 848

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 25/6

6:01 a.m.-1:09 p.m.

1 stop6h 08m

Montreal Pierre Elliott Trudeau Intl

Sat 4/7

9:45 a.m.-3:46 p.m.

1 stop7h 01m

C$ 850
Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 13/5

6:30 a.m.-2:40 p.m.

2 stops7h 10m

Montreal Pierre Elliott Trudeau Intl

Wed 13/5

5:00 p.m.-9:13 p.m.

1 stop5h 13m

C$ 859

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 22/4

6:30 a.m.-4:10 p.m.

2 stops8h 40m

Montreal Pierre Elliott Trudeau Intl

Sun 26/4

6:00 a.m.-3:48 p.m.

2 stops10h 48m

C$ 894

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 28/6

6:01 a.m.-1:09 p.m.

1 stop6h 08m

Montreal Pierre Elliott Trudeau Intl

Tue 7/7

6:00 a.m.-3:46 p.m.

2 stops10h 46m

C$ 900
Cheapest one-way

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 11/5

8:03 p.m.-11:44 a.m.

1 stop14h 41m

C$ 234

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 11/5

5:27 p.m.-2:13 p.m.

2 stops19h 46m

C$ 326

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/3

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
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.

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 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$ 796, American Airlines can have you in Montreal Pierre Elliott Trudeau Intl Airport from St. Louis in 7h 39m. There are 1556 km between St. Louis and Montreal Pierre Elliott Trudeau Intl Airport. This flight may include one or multiple stops.

  • 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
Sherbrooke
Cornwall
Montebello
Brossard
Boucherville
Longueuil
Magog
Saint-Jean-sur-Richelieu
Bromont
Drummondville
North Hatley
Saint-Sauveur
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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Joplin to Pierre Elliott Trudeau Intl flights

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Users can book flights with no change fees policies with our dedicated filters. Book flights from St. Louis to Pierre Elliott Trudeau Intl flexibly with Cheapflights today.

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