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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from C$ 242

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis departing on 29/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
4:35 p.m. - 9:21 a.m.
YUL
-
STL
17h 46m1 stop
Multiple Airlines Logo
5:42 p.m. - 5:00 p.m.
STL
-
YUL
22h 18m2 stops
C$ 406Multiple Airlines
Sun, 25 Jan - Tue, 3 Feb
Multiple Airlines Logo
4:35 p.m. - 12:27 a.m.
YUL
-
STL
8h 52m1 stop
Multiple Airlines Logo
3:49 p.m. - 5:00 p.m.
STL
-
YUL
24h 11m2 stops
C$ 435Multiple Airlines
Fri, 20 Feb - Mon, 23 Feb
Multiple Airlines Logo
4:35 p.m. - 12:27 a.m.
YUL
-
STL
8h 52m1 stop
Multiple Airlines Logo
3:49 p.m. - 12:30 a.m.
STL
-
YUL
7h 41m1 stop
C$ 486Multiple Airlines
Fri, 20 Feb - Mon, 23 Feb
American Airlines Logo
2:25 p.m. - 10:20 a.m.
YUL
-
STL
20h 55m2 stops
American Airlines Logo
1:35 p.m. - 3:08 p.m.
STL
-
YUL
24h 33m1 stop
C$ 624American Airlines
Fri, 6 Feb - Mon, 9 Feb
American Airlines Logo
3:55 p.m. - 9:34 a.m.
YUL
-
STL
18h 39m1 stop
American Airlines Logo
6:33 p.m. - 3:10 p.m.
STL
-
YUL
19h 37m1 stop
C$ 636American Airlines
Fri, 20 Feb - Mon, 23 Feb
American Airlines Logo
7:00 a.m. - 3:04 p.m.
YUL
-
STL
9h 04m1 stop
American Airlines Logo
6:00 a.m. - 3:08 p.m.
STL
-
YUL
8h 08m1 stop
C$ 680American Airlines
Sun, 25 Jan - Tue, 3 Feb
Delta Logo
7:30 p.m. - 12:36 p.m.
YUL
-
STL
18h 06m1 stop
Delta Logo
5:56 p.m. - 11:12 p.m.
STL
-
YUL
4h 16m1 stop
C$ 698Delta
Fri, 30 Jan - Mon, 2 Feb
Delta Logo
7:00 a.m. - 4:07 p.m.
YUL
-
STL
10h 07m1 stop
Delta Logo
7:25 a.m. - 1:31 p.m.
STL
-
YUL
5h 06m1 stop
C$ 713Delta
Wed, 28 Jan - Sat, 31 Jan
American Airlines Logo
3:55 p.m. - 9:34 a.m.
YUL
-
STL
18h 39m1 stop
American Airlines Logo
10:04 a.m. - 10:44 p.m.
STL
-
YUL
11h 40m2 stops
C$ 728American Airlines
Fri, 20 Feb - Mon, 23 Feb
Delta Logo
9:34 a.m. - 8:37 p.m.
YUL
-
STL
12h 03m2 stops
Delta Logo
6:10 a.m. - 1:42 p.m.
STL
-
YUL
6h 32m1 stop
C$ 734Delta
Wed, 28 Jan - Sat, 31 Jan

Delta flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Our best Delta deals on Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flight tickets
Delta
30 Jan
YUL7:30 p.m.Montreal Pierre Elliott Trudeau Intl
18h 06m
1 stop
STL12:36 p.m.Lambert-St Louis
2 Feb
STL5:56 p.m.Lambert-St Louis
4h 16m
1 stop
YUL11:12 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 698
Find similar
Delta
28 Jan
YUL7:00 a.m.Montreal Pierre Elliott Trudeau Intl
10h 07m
1 stop
STL4:07 p.m.Lambert-St Louis
31 Jan
STL7:25 a.m.Lambert-St Louis
5h 06m
1 stop
YUL1:31 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 713
Find similar
Delta
28 Jan
YUL9:34 a.m.Montreal Pierre Elliott Trudeau Intl
12h 03m
2 stops
STL8:37 p.m.Lambert-St Louis
31 Jan
STL6:10 a.m.Lambert-St Louis
6h 32m
1 stop
YUL1:42 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 734
Find similar

United Airlines flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Our best United Airlines deals on Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flight tickets
United Airlines
25 Jan
YUL7:00 a.m.Montreal Pierre Elliott Trudeau Intl
11h 43m
2 stops
STL5:43 p.m.Lambert-St Louis
3 Feb
STL11:20 a.m.Lambert-St Louis
9h 22m
2 stops
YUL9:42 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 766
Find similar
United Airlines
28 Jan
YUL2:13 p.m.Montreal Pierre Elliott Trudeau Intl
8h 00m
2 stops
STL9:13 p.m.Lambert-St Louis
31 Jan
STL6:30 a.m.Lambert-St Louis
7h 46m
2 stops
YUL3:16 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 792
Find similar
United Airlines
20 Mar
YUL4:45 p.m.Montreal Pierre Elliott Trudeau Intl
5h 22m
1 stop
STL9:07 p.m.Lambert-St Louis
22 Mar
STL5:00 a.m.Lambert-St Louis
9h 16m
2 stops
YUL3:16 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 833
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis 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, momondo users made 96,600 searches. Data last updated 15 December 2025.
Use the filters below to find and compare flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 25/1

4:35 p.m.-9:21 a.m.

1 stop17h 46m

Lambert-St Louis

Tue 3/2

5:42 p.m.-5:00 p.m.

2 stops22h 18m

C$ 406

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 20/2

4:35 p.m.-12:27 a.m.

1 stop8h 52m

Lambert-St Louis

Mon 23/2

3:49 p.m.-5:00 p.m.

2 stops24h 11m

C$ 435

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 20/2

4:35 p.m.-12:27 a.m.

1 stop8h 52m

Lambert-St Louis

Mon 23/2

3:49 p.m.-12:30 a.m.

1 stop7h 41m

C$ 486

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 6/2

2:25 p.m.-10:20 a.m.

2 stops20h 55m

Lambert-St Louis

Mon 9/2

1:35 p.m.-3:08 p.m.

1 stop24h 33m

C$ 624

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 20/2

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

1 stop18h 39m

Lambert-St Louis

Mon 23/2

6:33 p.m.-3:10 p.m.

1 stop19h 37m

C$ 636

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 25/1

7:00 a.m.-3:04 p.m.

1 stop9h 04m

Lambert-St Louis

Tue 3/2

6:00 a.m.-3:08 p.m.

1 stop8h 08m

C$ 680

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 30/1

7:30 p.m.-12:36 p.m.

1 stop18h 06m

Lambert-St Louis

Mon 2/2

5:56 p.m.-11:12 p.m.

1 stop4h 16m

C$ 698

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 28/1

7:00 a.m.-4:07 p.m.

1 stop10h 07m

Lambert-St Louis

Sat 31/1

7:25 a.m.-1:31 p.m.

1 stop5h 06m

C$ 713

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 20/2

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

1 stop18h 39m

Lambert-St Louis

Mon 23/2

10:04 a.m.-10:44 p.m.

2 stops11h 40m

C$ 728

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 28/1

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

2 stops12h 03m

Lambert-St Louis

Sat 31/1

6:10 a.m.-1:42 p.m.

1 stop6h 32m

C$ 734

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
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See travel insights to St. Louis from

How to get the cheapest flight ticket from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Montreal Pierre Elliott Trudeau Intl Airport and St. Louis?

What is the cheapest month to fly to St. Louis?

The month of May is, on average, the cheapest month to fly to St. Louis from Montreal Pierre Elliott Trudeau Intl Airport, with most prices found around C$ 617. If you don’t want to visit St. Louis in May, then you should wait until April to fly from Montreal Pierre Elliott Trudeau Intl Airport, when ticket prices are also cheap, with an average price of C$ 668.

What is the cheapest day to depart on your flight to St. Louis?

Our data shows that Friday is the least expensive day to fly to St. Louis. Tickets to fly out on this day can be as low as C$ 617. The most expensive day to fly to St. Louis is Monday, with ticket prices averaging around C$ 1,115.

What is the cheapest time of day to depart on your flight to St. Louis?

The cheapest time of day to fly to St. Louis is in the morning when flights can be purchased for as low as C$ 698. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are C$ 754 on average. Flights to St. Louis from Montreal Pierre Elliott Trudeau Intl Airport in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

What is the cheapest Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis flight route?

Fly from Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis for the best Montreal Pierre Elliott Trudeau Intl - Lambert-St Louis flight prices

What cabin class options are available on Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis flights?

There is only 1 cabin class available to choose from on Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flights?

You could potentially save up to 14% on your flight if you consider stops on a Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flight.

When to book flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Montreal Pierre Elliott Trudeau Intl Airport to St. Louis (YUL to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Fastest flight time

2h 55m

Direct flights

Mon

Airports in St. Louis

1 airport
The fastest flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis takes 2h 55m
Direct flights go from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis on Monday. The only airline offering direct flights is Air Canada.
There is 1 airport in St. Louis. From Montreal Pierre Elliott Trudeau Intl Airport there are direct flights to Lambert-St Louis (STL).
Search flight deals

  • How far is Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis by plane?

    A flight from Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis will travel around 1551.0 km. By plane, this route typically takes 2h 55m.

  • When did momondo last update prices for flights from Montreal Pierre Elliott Trudeau Intl Airport to Lambert-St Louis Airport?

    Prices for flights from Montreal Pierre Elliott Trudeau Intl Airport to Lambert-St Louis Airport are updated daily.

  • How many operators does momondo search for flights from Montreal Pierre Elliott Trudeau Intl Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from Montreal Pierre Elliott Trudeau Intl Airport to Lambert-St Louis Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Montreal Pierre Elliott Trudeau Intl Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents required for your trip to Lambert-St Louis Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

  • What is the most popular airline from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

Best airlines flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Compare and see reviews for airlines that fly from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom C$ 540Free CancellationRating
7.1
10,525 reviews
Search Air Canada flights
United AirlinesPriceFrom C$ 590Free CancellationRating
7.4
9,092 reviews
Search United Airlines flights
WestJetPriceFrom C$ 738Free CancellationRating
7.2
3,202 reviews
Search WestJet flights

Travelling to a place near St. Louis?

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Chesterfield
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Can I find flights from Montreal to St. Louis with flexible booking policies on momondo?

momondo does allow users to show only those flights to St. Louis from Montreal which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Montreal to St. Louis?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to St. Louis from Montreal.

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