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Cheap flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport from C$ 353

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 4/1. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YUL
11 Jan — 18 Jan1
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 12 December 2025.

Wed 31/126:00 a.m.STL - YUL
1 stop17h 40mMultiple Airlines
Mon 5/14:35 p.m.YUL - STL
1 stop30h 58mMultiple Airlines
Deal found 11/12C$ 816
Tue 30/1210:48 a.m.STL - YUL
2 stops36h 42mMultiple Airlines
Mon 5/14:35 p.m.YUL - STL
1 stop30h 58mMultiple Airlines
Deal found 11/12C$ 847
Thu 11/122:47 p.m.STL - YUL
2 stops16h 01mMultiple Airlines
Mon 15/127:25 p.m.YUL - STL
3 stops24h 11mMultiple Airlines
Deal found 11/12C$ 983
Thu 18/1210:42 a.m.STL - YUL
2 stops13h 03mMultiple Airlines
Sun 4/14:35 p.m.YUL - STL
1 stop18h 10mMultiple Airlines
Deal found 10/12C$ 994
Tue 30/125:59 p.m.STL - YUL
1 stop4h 20mDelta
Thu 8/19:34 a.m.YUL - STL
2 stops12h 09mDelta
Deal found 10/12C$ 1,033
Tue 30/125:00 a.m.STL - YUL
1 stop16h 39mAmerican Airlines
Thu 8/17:00 a.m.YUL - STL
1 stop9h 04mAmerican Airlines
Deal found 11/12C$ 1,044
Wed 31/124:53 p.m.STL - YUL
1 stop21h 17mAmerican Airlines
Mon 5/17:08 a.m.YUL - STL
1 stop17h 47mAmerican Airlines
Deal found 11/12C$ 1,047
Wed 31/124:05 p.m.STL - YUL
1 stop6h 17mAir Canada
Mon 5/18:50 a.m.YUL - STL
2 stops7h 39mAir Canada
Deal found 9/12C$ 1,052

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 12 December 2025.

Round-trip from

C$ 506

One-way from

C$ 353

Popular in

February

Cheapest in

July

Average price

C$ 912
28/1-1/2
  • 28/1-1/2
  • 3 total stops
  • 35h 34m total
  • St. Louis to Montreal
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4/1
  • 4/1
  • 2 total stops
  • 28h 28m total
  • St. Louis to Montreal
Search Deals
Highest demand for flights based on searches. 24% potential increase in price (C$ 427 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 8% potential price decrease (C$ 103 potential savings vs. average RT price).
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Average for round-trip flights in December 2025
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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 12 December 2025.
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

Thu 26/2

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

1 stop8h 05m

Montreal Pierre Elliott Trudeau Intl

Mon 2/3

3:55 p.m.-9:29 a.m.

1 stop18h 34m

C$ 739

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 19/1

6:00 a.m.-12:40 a.m.

1 stop17h 40m

Montreal Pierre Elliott Trudeau Intl

Mon 26/1

8:00 a.m.-11:33 p.m.

2 stops40h 33m

C$ 767

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 8/1

6:44 p.m.-3:08 p.m.

1 stop19h 24m

Montreal Pierre Elliott Trudeau Intl

Thu 15/1

3:50 p.m.-10:20 a.m.

1 stop19h 30m

C$ 794

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 19/1

6:35 a.m.-6:37 p.m.

2 stops11h 02m

Montreal Pierre Elliott Trudeau Intl

Mon 26/1

9:34 a.m.-8:43 p.m.

2 stops12h 09m

C$ 800

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 31/12

6:00 a.m.-12:40 a.m.

1 stop17h 40m

Montreal Pierre Elliott Trudeau Intl

Mon 5/1

5:10 p.m.-10:33 p.m.

2 stops30h 23m

C$ 822

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 26/2

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

1 stop8h 05m

Montreal Pierre Elliott Trudeau Intl

Sun 1/3

3:55 p.m.-9:34 a.m.

1 stop18h 39m

C$ 861

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 13/3

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

1 stop15h 06m

Montreal Pierre Elliott Trudeau Intl

Fri 20/3

4:35 p.m.-7:07 a.m.

1 stop15h 32m

C$ 867

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 29/1

9:57 a.m.-9:17 p.m.

1 stop10h 20m

Montreal Pierre Elliott Trudeau Intl

Mon 2/2

6:25 p.m.-2:30 p.m.

1 stop21h 05m

C$ 895

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 16/3

8:53 p.m.-12:30 a.m.

1 stop26h 37m

Montreal Pierre Elliott Trudeau Intl

Fri 20/3

4:35 p.m.-7:07 a.m.

1 stop15h 32m

C$ 899

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 5/1

9:45 a.m.-6:37 p.m.

1 stop7h 52m

Montreal Pierre Elliott Trudeau Intl

Wed 21/1

9:34 a.m.-8:37 p.m.

2 stops12h 03m

C$ 902

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/12

Showing 1-10 of 16 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$ 1,778). 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.

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$ 739, 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. 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 Air Canada (79%), Jazz (79%) or United Airlines (79%) 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.

  • 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$ 1,778). 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
Cornwall
Sherbrooke
Trois-Rivières
Brossard
Montebello
Boucherville
Longueuil
Drummondville
Magog
Saint-Jean-sur-Richelieu
Bromont
North Hatley
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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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.

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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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