Find flights
When to book
FAQs

Cheap flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport from C$ 210

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 15/12. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YUL
27 Nov — 4 Dec1
1 adult
1 adult, Economy, 0 bags

Find 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 October 2025.

Wed 10/123:30 p.m.STL - YUL
2 stops27h 14mMultiple Airlines
Wed 17/124:35 p.m.YUL - STL
1 stop30h 58mMultiple Airlines
Deal found 26/10C$ 547
Sun 16/112:12 p.m.STL - YUL
1 stop9h 18mMultiple Airlines
Sat 22/116:45 a.m.YUL - STL
2 stops28h 18mMultiple Airlines
Deal found 26/10C$ 557
Wed 26/119:50 a.m.STL - YUL
3 stops12h 32mMultiple Airlines
Wed 3/125:10 p.m.YUL - STL
2 stops21h 42mMultiple Airlines
Deal found 27/10C$ 650
Thu 11/127:35 p.m.STL - YUL
1 stop18h 35mAmerican Airlines
Thu 18/123:51 p.m.YUL - STL
1 stop8h 54mAmerican Airlines
Deal found 27/10C$ 692
Thu 11/123:30 p.m.STL - YUL
2 stops27h 14mMultiple Airlines
Thu 18/124:35 p.m.YUL - STL
1 stop26h 38mMultiple Airlines
Deal found 27/10C$ 731
Wed 26/116:00 a.m.STL - YUL
1 stop8h 09mAmerican Airlines
Wed 3/123:50 p.m.YUL - STL
1 stop17h 18mAmerican Airlines
Deal found 27/10C$ 733
Tue 30/126:35 p.m.STL - YUL
1 stop18h 25mUnited Airlines
Thu 8/11:10 p.m.YUL - STL
1 stop10h 48mUnited Airlines
Deal found 28/10C$ 747
Thu 11/122:47 p.m.STL - YUL
1 stop24h 36mMultiple Airlines
Mon 15/124:45 p.m.YUL - STL
1 stop5h 02mMultiple Airlines
Deal found 26/10C$ 758

Cheap 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 October 2025.

Round-trip from

C$ 526

One-way from

C$ 210

Popular in

February

Cheapest in

July

Average price

C$ 968
American Airlines
  • American Airlines
  • 16/1-19/1
  • 2 total stops
  • 38h 53m total
  • St. Louis to Montreal
Search Deals
15/12
  • 15/12
  • 3 total stops
  • 31h 57m total
  • St. Louis to Montreal
Search Deals
Highest demand for flights based on searches. 17% potential increase in price (C$ 291 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 45 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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 October 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

Fri 16/1

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

1 stop19h 24m

Montreal Pierre Elliott Trudeau Intl

Mon 19/1

3:52 p.m.-10:21 a.m.

1 stop19h 29m

C$ 526

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 17/2

11:25 a.m.-9:17 p.m.

1 stop8h 52m

Montreal Pierre Elliott Trudeau Intl

Thu 19/2

1:10 p.m.-10:59 p.m.

1 stop10h 49m

C$ 545

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 16/11

2:12 p.m.-12:30 a.m.

1 stop9h 18m

Montreal Pierre Elliott Trudeau Intl

Sat 22/11

6:45 a.m.-10:03 a.m.

2 stops28h 18m

C$ 557

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 12/1

9:57 a.m.-9:42 p.m.

2 stops10h 45m

Montreal Pierre Elliott Trudeau Intl

Tue 13/1

1:10 p.m.-10:58 p.m.

1 stop10h 48m

C$ 652

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 18/2

11:25 a.m.-10:20 a.m.

1 stop21h 55m

Montreal Pierre Elliott Trudeau Intl

Sun 22/2

1:10 p.m.-10:59 p.m.

1 stop10h 49m

C$ 697

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 18/2

9:58 a.m.-10:50 p.m.

2 stops11h 52m

Montreal Pierre Elliott Trudeau Intl

Sun 22/2

7:30 a.m.-6:03 p.m.

2 stops11h 33m

C$ 747

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 30/12

6:35 p.m.-3:57 p.m.

1 stop20h 22m

Montreal Pierre Elliott Trudeau Intl

Thu 8/1

9:25 a.m.-10:58 p.m.

1 stop14h 33m

C$ 747

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 3/12

5:05 a.m.-3:10 p.m.

1 stop9h 05m

Montreal Pierre Elliott Trudeau Intl

Sun 7/12

3:50 p.m.-8:08 a.m.

1 stop17h 18m

C$ 762

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 15/12

10:47 a.m.-7:44 p.m.

3 stops31h 57m

C$ 210

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 15/11

7:45 p.m.-12:30 a.m.

2 stops27h 45m

C$ 262

Flights are sorted by cheapest round-trip flights first.

Deals found on 26/10

Showing 1-10 of 15 results
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 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$ 305). Flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport in November is currently the most expensive (average of C$ 846). 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$ 545, American Airlines can have you in Montreal Pierre Elliott Trudeau Intl Airport from St. Louis in 8h 52m. 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 Sun Country Air (100%), Air Canada (87%) or Jazz (87%) 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$ 305). Flying from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport in November is currently the most expensive (average of C$ 846). 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
Brossard
Longueuil
Montebello
Trois-Rivières
Drummondville
Saint-Jean-sur-Richelieu
Boucherville
Bromont
North Hatley
Louiseville

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from St. Louis to Pierre Elliott Trudeau Intl?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from St. Louis to Pierre Elliott Trudeau Intl. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.