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Cheap flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport from C$ 268

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 16/4. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YUL
26 Feb — 5 Mar1
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 27 January 2026.

Tue 17/26:00 a.m.
STL
-
YUL
1 stop8h 04m
American Airlines
Fri 20/23:45 p.m.
YUL
-
STL
1 stop19h 28m
American Airlines
Deal found 26/1C$ 504
Tue 10/36:37 p.m.
STL
-
YUL
1 stop19h 28m
American Airlines
Tue 17/312:59 p.m.
YUL
-
STL
2 stops11h 45m
American Airlines
Deal found 26/1C$ 518
Thu 5/36:00 a.m.
STL
-
YUL
1 stop8h 04m
American Airlines
Mon 9/33:45 p.m.
YUL
-
STL
1 stop8h 59m
American Airlines
Deal found 25/1C$ 522
Fri 3/48:24 a.m.
STL
-
YUL
1 stop15h 06m
Multiple Airlines
Mon 6/45:10 p.m.
YUL
-
STL
2 stops31h 15m
Multiple Airlines
Deal found 27/1C$ 578
Wed 22/44:55 p.m.
STL
-
YUL
1 stop30h 35m
Multiple Airlines
Sun 26/45:10 p.m.
YUL
-
STL
2 stops14h 40m
Multiple Airlines
Deal found 26/1C$ 589
Thu 16/44:55 p.m.
STL
-
YUL
1 stop30h 35m
Multiple Airlines
Fri 24/48:00 a.m.
YUL
-
STL
2 stops23h 50m
Multiple Airlines
Deal found 25/1C$ 620
Thu 16/44:55 p.m.
STL
-
YUL
1 stop30h 35m
Multiple Airlines
Sun 26/48:00 a.m.
YUL
-
STL
2 stops23h 50m
Multiple Airlines
Deal found 25/1C$ 624
Thu 19/26:00 a.m.
STL
-
YUL
1 stop8h 04m
British Airways
Mon 23/212:59 p.m.
YUL
-
STL
2 stops11h 49m
British Airways
Deal found 26/1C$ 649
Thu 16/46:00 a.m.
STL
-
YUL
1 stop4h 44m
American Airlines
Sat 25/412:30 p.m.
YUL
-
STL
1 stop12h 18m
American Airlines
Deal found 25/1C$ 652
Sat 21/36:14 a.m.
STL
-
YUL
1 stop8h 06m
American Airlines
Tue 24/33:45 p.m.
YUL
-
STL
1 stop19h 18m
American Airlines
Deal found 26/1C$ 665

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 27 January 2026.

Round-trip from

C$ 504

One-way from

C$ 268

Popular in

February

Cheapest in

July

Average price

C$ 932
American Airlines
  • American Airlines
  • 17/2-20/2
  • 2 total stops
  • 27h 32m total
  • St. Louis to Montreal
Search Deals
16/4
  • 16/4
  • 2 total stops
  • 36h 09m total
  • St. Louis to Montreal
Search Deals
Highest demand for flights based on searches. 23% potential increase in price (C$ 404 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 8% potential price decrease (C$ 101 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 27 January 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

St. Louis

Fly to

Pierre Elliott Trudeau Intl

Route

Depart

Return

Price

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 11/3

6:00 a.m.-3:05 p.m.

1 stop8h 05m

Montreal Pierre Elliott Trudeau Intl

Wed 18/3

3:45 p.m.-11:44 p.m.

1 stop8h 59m

C$ 504

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 7/4

4:46 p.m.-11:44 a.m.

1 stop17h 58m

Montreal Pierre Elliott Trudeau Intl

Thu 9/4

12:30 p.m.-11:48 p.m.

1 stop12h 18m

C$ 504

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 10/3

6:37 p.m.-3:05 p.m.

1 stop19h 28m

Montreal Pierre Elliott Trudeau Intl

Tue 17/3

12:59 p.m.-11:44 p.m.

2 stops11h 45m

C$ 518

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 5/3

6:00 a.m.-3:04 p.m.

1 stop8h 04m

Montreal Pierre Elliott Trudeau Intl

Mon 9/3

3:45 p.m.-11:44 p.m.

1 stop8h 59m

C$ 522

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 3/4

8:24 a.m.-12:30 a.m.

1 stop15h 06m

Montreal Pierre Elliott Trudeau Intl

Mon 6/4

5:10 p.m.-11:25 p.m.

2 stops31h 15m

C$ 578

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 16/4

4:55 p.m.-12:30 a.m.

1 stop30h 35m

Montreal Pierre Elliott Trudeau Intl

Fri 24/4

8:00 a.m.-6:50 a.m.

2 stops23h 50m

C$ 620

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 16/4

4:55 p.m.-12:30 a.m.

1 stop30h 35m

Montreal Pierre Elliott Trudeau Intl

Sun 26/4

8:00 a.m.-6:50 a.m.

2 stops23h 50m

C$ 624

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 19/2

6:00 a.m.-3:04 p.m.

1 stop8h 04m

Montreal Pierre Elliott Trudeau Intl

Mon 23/2

12:59 p.m.-11:48 p.m.

2 stops11h 49m

C$ 649

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 16/4

6:00 a.m.-11:44 a.m.

1 stop4h 44m

Montreal Pierre Elliott Trudeau Intl

Sat 25/4

12:30 p.m.-11:48 p.m.

1 stop12h 18m

C$ 652

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 24/4

6:00 a.m.-11:44 a.m.

1 stop4h 44m

Montreal Pierre Elliott Trudeau Intl

Mon 27/4

12:30 p.m.-11:48 p.m.

1 stop12h 18m

C$ 652

Flights are sorted by cheapest round-trip flights first.

Deals found on 26/1

Showing 1-10 of 22 results
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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 month to book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?

Currently, July is the cheapest month in which you can book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport (average of C$ 301). Flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport in February is currently the most expensive (average of C$ 1,765). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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$ 504, American Airlines can have you in Montreal Pierre Elliott Trudeau Intl Airport from St. Louis in 8h 05m. There are 1556 km between St. Louis and 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.

  • What is the cheapest month to book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport?

    Currently, July is the cheapest month in which you can book a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport (average of C$ 301). Flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport in February is currently the most expensive (average of C$ 1,765). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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
Cornwall
Brossard
Montebello
Boucherville
Longueuil
Drummondville
Magog
Saint-Jean-sur-Richelieu
Bromont
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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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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