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Cheap flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport from C$ 302

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 22/8. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YUL
27 Aug — 3 Sep1
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 July 2026.

Mon 31/86:00 a.m.
STL
-
YUL
1 stop9h 50m
American Airlines
Fri 4/95:34 p.m.
YUL
-
STL
1 stop15h 50m
American Airlines
Deal found 23/7C$ 671
Sat 17/107:29 a.m.
STL
-
YUL
1 stop8h 23m
American Airlines
Sat 24/1012:30 p.m.
YUL
-
STL
1 stop12h 28m
American Airlines
Deal found 24/7C$ 684
Sat 17/105:00 a.m.
STL
-
YUL
1 stop10h 52m
American Airlines
Mon 26/105:34 p.m.
YUL
-
STL
1 stop18h 17m
American Airlines
Deal found 27/7C$ 685
Sat 5/98:06 p.m.
STL
-
YUL
1 stop19h 44m
American Airlines
Tue 8/95:34 p.m.
YUL
-
STL
1 stop17h 46m
American Airlines
Deal found 27/7C$ 688
Tue 18/86:00 a.m.
STL
-
YUL
1 stop9h 50m
American Airlines
Fri 21/85:34 p.m.
YUL
-
STL
1 stop15h 50m
American Airlines
Deal found 27/7C$ 700
Tue 25/89:32 a.m.
STL
-
YUL
2 stops11h 12m
American Airlines
Tue 1/95:34 p.m.
YUL
-
STL
1 stop15h 50m
American Airlines
Deal found 27/7C$ 702
Fri 11/95:00 a.m.
STL
-
YUL
1 stop10h 53m
American Airlines
Fri 18/95:34 p.m.
YUL
-
STL
1 stop17h 46m
American Airlines
Deal found 27/7C$ 738
Sat 10/105:21 p.m.
STL
-
YUL
1 stop17h 23m
American Airlines
Wed 14/1012:30 p.m.
YUL
-
STL
1 stop12h 28m
American Airlines
Deal found 26/7C$ 746
Tue 8/92:55 p.m.
STL
-
YUL
1 stop17h 54m
American Airlines
Tue 15/912:31 p.m.
YUL
-
STL
1 stop12h 56m
American Airlines
Deal found 26/7C$ 749
Tue 18/86:00 a.m.
STL
-
YUL
1 stop9h 50m
American Airlines
Sat 22/812:29 p.m.
YUL
-
STL
1 stop12h 29m
American Airlines
Deal found 27/7C$ 752

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 July 2026.

Round-trip from

C$ 671

One-way from

C$ 302

Popular in

September

Cheapest in

August

Average price

C$ 941
American Airlines
  • American Airlines
  • 31/8-4/9
  • 2 total stops
  • 25h 40m total
  • St. Louis to Montreal
Search Deals
American Airlines
  • American Airlines
  • 22/8
  • 1 total stop
  • 14h 37m total
  • St. Louis to Montreal
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (C$ 40 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (C$ 62 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

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 July 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

Tue 13/10

8:00 a.m.-10:40 a.m.

1 stop25h 40m

Montreal Pierre Elliott Trudeau Intl

Sat 17/10

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

1 stop12h 36m

C$ 835

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 6/10

9:04 a.m.-9:26 p.m.

1 stop11h 22m

Montreal Pierre Elliott Trudeau Intl

Mon 12/10

8:40 a.m.-9:21 p.m.

1 stop13h 41m

C$ 850

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 1/10

8:00 a.m.-5:30 p.m.

1 stop8h 30m

Montreal Pierre Elliott Trudeau Intl

Tue 13/10

1:15 p.m.-9:21 p.m.

1 stop9h 06m

C$ 850

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 21/10

7:29 a.m.-4:52 p.m.

1 stop8h 23m

Montreal Pierre Elliott Trudeau Intl

Sun 25/10

10:32 a.m.-8:52 p.m.

1 stop11h 20m

C$ 877

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 31/12

9:37 a.m.-9:01 p.m.

1 stop10h 24m

Montreal Pierre Elliott Trudeau Intl

Wed 6/1

4:45 p.m.-8:57 a.m.

1 stop17h 12m

C$ 901

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 11/9

3:40 p.m.-7:05 a.m.

2 stops14h 25m

Montreal Pierre Elliott Trudeau Intl

Fri 18/9

8:00 p.m.-9:34 a.m.

2 stops14h 34m

C$ 918

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 3/9

6:25 p.m.-11:30 p.m.

1 stop4h 05m

Montreal Pierre Elliott Trudeau Intl

Mon 7/9

7:20 p.m.-1:10 p.m.

2 stops42h 50m

C$ 970

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 26/8

8:00 a.m.-7:03 p.m.

1 stop10h 03m

Montreal Pierre Elliott Trudeau Intl

Wed 2/9

4:55 p.m.-6:42 p.m.

Nonstop2h 47m

C$ 989
Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 10/10

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

1 stop10h 01m

Montreal Pierre Elliott Trudeau Intl

Wed 14/10

4:55 p.m.-6:41 p.m.

Nonstop2h 46m

C$ 989

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 30/8

12:10 p.m.-3:42 p.m.

Nonstop2h 32m

Montreal Pierre Elliott Trudeau Intl

Tue 1/9

6:30 p.m.-2:57 p.m.

1 stop21h 27m

C$ 997

Flights are sorted by cheapest round-trip flights first.

Deals found on 24/7

Showing 1-10 of 15 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
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 July 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?

Airfare is typical for this route at the moment.

St. Louis to Montreal Pierre Elliott Trudeau Intl Airport flights typically cost between C$ 423 and C$ 1,052 in August.
The cheapest round-trip price found within the last 5 days was C$ 671 on American Airlines (31 Aug-4 Sep).

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$ 877, United Airlines can have you in Montreal Pierre Elliott Trudeau Intl Airport from St. Louis in 8h 23m. There are 1556 km between St. Louis and Montreal Pierre Elliott Trudeau Intl Airport. This flight may include one or multiple stops.

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

    Consider United Airlines (61%), Air Canada (58%) or Jazz (53%) 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
Dorval
Trois-Rivières
Laval
Brossard
Cornwall
Longueuil
Sherbrooke
Montebello
Boucherville
Magog
Bromont
Saint-Jean-sur-Richelieu
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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How does Cheapflights help users find flights from St. Louis to Pierre Elliott Trudeau Intl?

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Why should you use Cheapflights to find cheap flight tickets from St. Louis to Pierre Elliott Trudeau Intl?

Millions of users choose and trust Cheapflights to book the best flight deals from St. Louis to Pierre Elliott Trudeau Intl for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from St. Louis to Pierre Elliott Trudeau Intl with no change fees?

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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