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Cheap flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport from C$ 292

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 18/5. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YUL
28 May — 4 Jun1
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 28 April 2026.

Sat 9/51:05 p.m.
STL
-
YUL
Nonstop2h 35m
Air Canada
Sun 10/56:30 p.m.
YUL
-
STL
Nonstop2h 55m
Air Canada
Deal found 25/4C$ 594
Fri 15/57:05 a.m.
STL
-
YUL
1 stop5h 16m
Air Canada
Sun 17/56:30 p.m.
YUL
-
STL
Nonstop2h 55m
Air Canada
Deal found 23/4C$ 633
Tue 9/67:30 a.m.
STL
-
YUL
1 stop14h 29m
American Airlines
Tue 16/612:30 p.m.
YUL
-
STL
1 stop12h 26m
American Airlines
Deal found 25/4C$ 680
Thu 28/51:05 p.m.
STL
-
YUL
Nonstop2h 35m
Air Canada
Mon 1/66:30 p.m.
YUL
-
STL
Nonstop2h 55m
Air Canada
Deal found 27/4C$ 688
Thu 28/56:15 a.m.
STL
-
YUL
1 stop8h 13m
American Airlines
Wed 3/610:30 a.m.
YUL
-
STL
1 stop11h 22m
American Airlines
Deal found 23/4C$ 691
Wed 13/51:05 p.m.
STL
-
YUL
Nonstop2h 35m
Air Canada
Sun 17/510:40 a.m.
YUL
-
STL
2 stops10h 29m
Air Canada
Deal found 25/4C$ 714
Mon 25/55:14 a.m.
STL
-
YUL
1 stop16h 45m
American Airlines
Thu 4/612:30 p.m.
YUL
-
STL
1 stop12h 46m
American Airlines
Deal found 27/4C$ 716
Sun 5/712:10 p.m.
STL
-
YUL
Nonstop2h 32m
Air Canada
Thu 9/74:55 p.m.
YUL
-
STL
Nonstop2h 47m
Air Canada
Deal found 25/4C$ 717
Wed 27/55:36 p.m.
STL
-
YUL
1 stop5h 05m
Multiple Airlines
Mon 1/67:15 p.m.
YUL
-
STL
2 stops23h 18m
Multiple Airlines
Deal found 27/4C$ 721

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 28 April 2026.

Round-trip from

C$ 594

One-way from

C$ 292

Popular in

September

Cheapest in

July

Average price

C$ 932
Air Canada
  • Air Canada
  • 9/5-10/5
  • Nonstop
  • 5h 30m total
  • St. Louis to Montreal
Search Deals
18/5
  • 18/5
  • 2 total stops
  • 24h 56m total
  • St. Louis to Montreal
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (C$ 67 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 25 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 28 April 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 9/5

1:24 p.m.-9:26 p.m.

1 stop7h 02m

Montreal Pierre Elliott Trudeau Intl

Sun 10/5

9:45 a.m.-2:32 p.m.

1 stop5h 47m

C$ 706

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 19/6

1:39 p.m.-11:55 p.m.

1 stop9h 16m

Montreal Pierre Elliott Trudeau Intl

Sun 21/6

6:50 p.m.-11:56 p.m.

1 stop6h 06m

C$ 722

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 3/6

6:00 a.m.-4:10 p.m.

1 stop9h 10m

Montreal Pierre Elliott Trudeau Intl

Fri 5/6

9:45 a.m.-2:23 p.m.

1 stop5h 38m

C$ 722

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 12/6

9:21 a.m.-5:45 p.m.

1 stop7h 24m

Montreal Pierre Elliott Trudeau Intl

Sun 14/6

6:50 p.m.-11:56 p.m.

1 stop6h 06m

C$ 722
Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 12/6

6:10 p.m.-11:28 p.m.

1 stop4h 18m

Montreal Pierre Elliott Trudeau Intl

Fri 19/6

6:00 a.m.-1:09 p.m.

1 stop8h 09m

C$ 722

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 23/5

6:04 p.m.-11:13 p.m.

1 stop4h 09m

Montreal Pierre Elliott Trudeau Intl

Sat 30/5

7:00 a.m.-2:48 p.m.

1 stop8h 48m

C$ 722

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 23/5

1:13 p.m.-12:13 a.m.

2 stops10h 00m

Montreal Pierre Elliott Trudeau Intl

Sat 30/5

6:10 a.m.-10:34 a.m.

1 stop5h 24m

C$ 736

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 25/6

12:35 p.m.-6:54 p.m.

1 stop5h 19m

Montreal Pierre Elliott Trudeau Intl

Wed 15/7

6:00 a.m.-1:05 p.m.

1 stop8h 05m

C$ 737

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 10/7

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

1 stop6h 08m

Montreal Pierre Elliott Trudeau Intl

Mon 13/7

11:23 a.m.-11:45 p.m.

1 stop13h 22m

C$ 751

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 15/7

9:23 a.m.-5:30 p.m.

1 stop7h 07m

Montreal Pierre Elliott Trudeau Intl

Sun 19/7

6:10 a.m.-12:11 p.m.

1 stop7h 01m

C$ 751

Flights are sorted by cheapest round-trip flights first.

Deals found on 23/4

Showing 1-10 of 19 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.

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 28 April 2026.

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?

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$ 706, United Airlines can have you in Montreal Pierre Elliott Trudeau Intl Airport from St. Louis in 7h 02m. 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
Dorval
Trois-Rivières
Sherbrooke
Brossard
Montebello
Cornwall
Longueuil
Boucherville
Magog
Saint-Jean-sur-Richelieu
Bromont
Drummondville
North Hatley
Saint-Sauveur
Louiseville

Browse thousands of different options on Cheapflights for your next trip

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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
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.

Can Cheapflights notify me if prices for flights from St. Louis to Pierre Elliott Trudeau Intl become cheaper?

Yes! Start tracking prices for St. Louis to Pierre Elliott Trudeau Intl flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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