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Cheap flights from Montreal to St. Louis from C$ 269

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 to St. Louis departing on 18/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult

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Find the cheapest flights from Montreal to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
4:35 p.m. - 10:33 p.m.
YUL
-
STL
30h 58m1 stop
Multiple Airlines Logo
1:07 p.m. - 7:05 a.m.
STL
-
YUL
16h 58m2 stops
C$ 435Multiple Airlines
Wed, 7 Jan - Mon, 12 Jan
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$ 437Multiple Airlines
Fri, 20 Feb - Mon, 23 Feb
American Airlines Logo
3:55 p.m. - 9:34 a.m.
YUL
-
STL
18h 39m1 stop
American Airlines Logo
6:00 a.m. - 3:05 p.m.
STL
-
YUL
8h 05m1 stop
C$ 466American Airlines
Fri, 20 Feb - Mon, 23 Feb
Multiple Airlines Logo
6:45 a.m. - 11:33 p.m.
YUL
-
STL
41h 48m2 stops
Multiple Airlines Logo
11:18 a.m. - 12:30 a.m.
STL
-
YUL
12h 12m1 stop
C$ 614Multiple Airlines
Fri, 30 Jan - Fri, 6 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$ 683Delta
Fri, 30 Jan - Mon, 2 Feb
United Airlines Logo
6:00 a.m. - 2:30 p.m.
YUL
-
STL
9h 30m1 stop
United Airlines Logo
4:49 p.m. - 2:00 p.m.
STL
-
YUL
20h 11m1 stop
C$ 688United Airlines
Wed, 28 Jan - Sat, 31 Jan
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$ 693Delta
Fri, 30 Jan - Mon, 2 Feb
Delta Logo
9:28 a.m. - 8:50 p.m.
YUL
-
STL
12h 22m1 stop
Delta Logo
7:00 a.m. - 8:43 a.m.
STL
-
YUL
24h 43m1 stop
C$ 694Delta
Tue, 21 Apr - Sat, 25 Apr
American Airlines Logo
7:12 a.m. - 6:08 p.m.
YUL
-
STL
11h 56m1 stop
American Airlines Logo
6:00 a.m. - 3:10 p.m.
STL
-
YUL
8h 10m1 stop
C$ 700American Airlines
Mon, 16 Feb - Wed, 18 Feb
American Airlines Logo
12:58 p.m. - 11:28 p.m.
YUL
-
STL
11h 30m2 stops
American Airlines Logo
10:04 a.m. - 10:44 p.m.
STL
-
YUL
11h 40m2 stops
C$ 701American Airlines
Fri, 20 Feb - Mon, 23 Feb

American Airlines flights from Montreal to St. Louis

Our best American Airlines deals on Montreal to St. Louis flight tickets
American Airlines
20 Feb
YUL3:55 p.m.Montreal Pierre Elliott Trudeau Intl
18h 39m
1 stop
STL9:34 a.m.Lambert-St Louis
23 Feb
STL6:00 a.m.Lambert-St Louis
8h 05m
1 stop
YUL3:05 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 466
Find similar
American Airlines
16 Feb
YUL7:12 a.m.Montreal Pierre Elliott Trudeau Intl
11h 56m
1 stop
STL6:08 p.m.Lambert-St Louis
18 Feb
STL6:00 a.m.Lambert-St Louis
8h 10m
1 stop
YUL3:10 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 700
Find similar
American Airlines
20 Feb
YUL12:58 p.m.Montreal Pierre Elliott Trudeau Intl
11h 30m
2 stops
STL11:28 p.m.Lambert-St Louis
23 Feb
STL10:04 a.m.Lambert-St Louis
11h 40m
2 stops
YUL10:44 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 701
Find similar

Delta flights from Montreal to St. Louis

Our best Delta deals on Montreal 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$ 683
Find similar
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$ 693
Find similar
Delta
21 Apr
YUL9:28 a.m.Montreal Pierre Elliott Trudeau Intl
12h 22m
1 stop
STL8:50 p.m.Lambert-St Louis
25 Apr
STL7:00 a.m.Lambert-St Louis
24h 43m
1 stop
YUL8:43 a.m.Montreal Pierre Elliott Trudeau Intl
C$ 694
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Montreal 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 18 December 2025.
Use the filters below to find and compare flights from Montreal 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

Wed 7/1

4:35 p.m.-10:33 p.m.

1 stop30h 58m

Lambert-St Louis

Mon 12/1

1:07 p.m.-7:05 a.m.

2 stops16h 58m

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.-5:00 p.m.

2 stops24h 11m

C$ 437

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

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

1 stop8h 05m

C$ 466

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 30/1

6:45 a.m.-11:33 p.m.

2 stops41h 48m

Lambert-St Louis

Fri 6/2

11:18 a.m.-12:30 a.m.

1 stop12h 12m

C$ 614

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$ 683

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 28/1

6:00 a.m.-2:30 p.m.

1 stop9h 30m

Lambert-St Louis

Sat 31/1

4:49 p.m.-2:00 p.m.

1 stop20h 11m

C$ 688

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$ 693

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 21/4

9:28 a.m.-8:50 p.m.

1 stop12h 22m

Lambert-St Louis

Sat 25/4

7:00 a.m.-8:43 a.m.

1 stop24h 43m

C$ 694

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 16/2

7:12 a.m.-6:08 p.m.

1 stop11h 56m

Lambert-St Louis

Wed 18/2

6:00 a.m.-3:10 p.m.

1 stop8h 10m

C$ 700

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 20/2

12:58 p.m.-11:28 p.m.

2 stops11h 30m

Lambert-St Louis

Mon 23/2

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

2 stops11h 40m

C$ 701

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
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See travel insights to St. Louis from

How to get the cheapest flight ticket from Montreal 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 and St. Louis?

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

The month of July is, on average, the cheapest month to fly to St. Louis from Montreal, with most prices found around C$ 394. If you don’t want to visit St. Louis in July, then you should wait until February to fly from Montreal, when ticket prices are also cheap, with an average price of C$ 627.

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$ 699. 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 in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

What is the cheapest Montreal to Lambert-St Louis flight route?

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

What cabin class options are available on Montreal to Lambert-St Louis flights?

There is only 1 cabin class available to choose from on Montreal 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 to St. Louis flights?

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

When to book flights from Montreal to St. Louis

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

Cheap Montreal to St. Louis (YMQ to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Montreal to St. Louis

Fastest flight time

2h 55m

Direct flights

Mon and Tue

Airports in St. Louis

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

  • How far is Montreal to Lambert-St Louis by plane?

    The straight-line distance from Montreal to Lambert-St Louis is 1566.0 km. Flights usually cover this in 2h 55m, depending on flying conditions and air traffic around both airports.

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

    Prices for flights from Montreal to Lambert-St Louis Airport are updated daily.

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

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Montreal to Lambert-St Louis Airport.

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

    The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Montreal to St. Louis?

  • What is the most popular airline from Montreal to St. Louis?

Best airlines flying from Montreal to St. Louis

Compare and see reviews for airlines that fly from Montreal to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom C$ 540Free CancellationRating
7.1
10,534 reviews
Search Air Canada flights
United AirlinesPriceFrom C$ 591Free CancellationRating
7.4
9,092 reviews
Search United Airlines flights
WestJetPriceFrom C$ 738Free CancellationRating
7.2
3,204 reviews
Search WestJet flights

Travelling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Chesterfield
Litchfield

Why use momondo?

Why should I use momondo to find a flight deal from Montreal to St. Louis?

It is quick and easy to find Montreal to St. Louis flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to St. Louis that suits you.

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

Yes. All flights to St. Louis from Montreal on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once all potential Montreal to St. Louis flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Montreal to St. Louis right now. Can momondo alert me if prices change?

If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from Montreal and alert you when they change.

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