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Cheap flights from Montreal to St. Louis from C$ 300

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 5/5. 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
1 adult, Economy, 0 bags

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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.
American Airlines Logo
12:30 p.m. - 10:19 p.m.
YUL
-
STL
10h 49m
1 stop
American Airlines Logo
8:03 p.m. - 11:44 a.m.
STL
-
YUL
14h 41m
1 stop
C$ 432American Airlines
Tue, 5 May - Tue, 12 May
American Airlines Logo
12:30 p.m. - 10:17 p.m.
YUL
-
STL
10h 47m
1 stop
American Airlines Logo
8:03 p.m. - 11:44 a.m.
STL
-
YUL
14h 41m
1 stop
C$ 449American Airlines
Wed, 15 Apr - Tue, 21 Apr
American Airlines Logo
12:30 p.m. - 8:09 p.m.
YUL
-
STL
8h 39m
1 stop
American Airlines Logo
2:33 p.m. - 11:44 a.m.
STL
-
YUL
20h 11m
1 stop
C$ 539American Airlines
Sat, 2 May - Sat, 9 May
American Airlines Logo
1:03 p.m. - 11:46 p.m.
YUL
-
STL
11h 43m
2 stops
American Airlines Logo
5:21 p.m. - 11:44 a.m.
STL
-
YUL
17h 23m
1 stop
C$ 553American Airlines
Sat, 2 May - Sat, 9 May
United Airlines Logo
9:15 a.m. - 9:13 p.m.
YUL
-
STL
12h 58m
2 stops
United Airlines Logo
7:45 a.m. - 9:26 p.m.
STL
-
YUL
12h 41m
1 stop
C$ 582United Airlines
Tue, 5 May - Tue, 12 May
Multiple Airlines Logo
8:00 a.m. - 6:50 a.m.
YUL
-
STL
23h 50m
2 stops
Multiple Airlines Logo
4:59 p.m. - 12:30 a.m.
STL
-
YUL
30h 31m
1 stop
C$ 617Multiple Airlines
Sun, 19 Apr - Wed, 22 Apr
Delta Logo
6:45 p.m. - 11:36 p.m.
YUL
-
STL
5h 51m
1 stop
Delta Logo
5:59 p.m. - 11:08 p.m.
STL
-
YUL
4h 09m
1 stop
C$ 630Delta
Mon, 20 Apr - Sat, 25 Apr
United Airlines Logo
1:20 p.m. - 11:11 p.m.
YUL
-
STL
10h 51m
1 stop
United Airlines Logo
6:30 a.m. - 5:30 p.m.
STL
-
YUL
10h 00m
1 stop
C$ 631United Airlines
Wed, 29 Apr - Sat, 2 May
American Airlines Logo
12:30 p.m. - 10:19 p.m.
YUL
-
STL
10h 49m
1 stop
American Airlines Logo
8:03 p.m. - 11:44 a.m.
STL
-
YUL
14h 41m
1 stop
C$ 645American Airlines
Sun, 10 May - Sat, 16 May
Delta Logo
6:45 p.m. - 11:36 p.m.
YUL
-
STL
5h 51m
1 stop
Delta Logo
5:15 p.m. - 11:57 p.m.
STL
-
YUL
5h 42m
1 stop
C$ 680Delta
Fri, 24 Apr - Sat, 30 May

WestJet flights from Montreal to St. Louis

Our best WestJet deals on Montreal to St. Louis flight tickets
WestJet
20 Apr
YUL6:00 a.m.Montreal Pierre Elliott Trudeau Intl
4h 42m
1 stop
STL9:42 a.m.Lambert-St Louis
25 Apr
STL5:35 p.m.Lambert-St Louis
4h 51m
1 stop
YUL11:26 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 727
WestJet
8 May
YUL5:06 p.m.Montreal Pierre Elliott Trudeau Intl
5h 03m
1 stop
STL9:09 p.m.Lambert-St Louis
11 May
STL5:15 p.m.Lambert-St Louis
5h 42m
1 stop
YUL11:57 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 728
WestJet
10 May
YUL7:00 a.m.Montreal Pierre Elliott Trudeau Intl
6h 20m
1 stop
STL12:20 p.m.Lambert-St Louis
16 May
STL6:04 p.m.Lambert-St Louis
23h 16m
2 stops
YUL6:20 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 753

American Airlines flights from Montreal to St. Louis

Our best American Airlines deals on Montreal to St. Louis flight tickets
American Airlines
5 May
YUL12:30 p.m.Montreal Pierre Elliott Trudeau Intl
10h 49m
1 stop
STL10:19 p.m.Lambert-St Louis
12 May
STL8:03 p.m.Lambert-St Louis
14h 41m
1 stop
YUL11:44 a.m.Montreal Pierre Elliott Trudeau Intl
C$ 432
American Airlines
15 Apr
YUL12:30 p.m.Montreal Pierre Elliott Trudeau Intl
10h 47m
1 stop
STL10:17 p.m.Lambert-St Louis
21 Apr
STL8:03 p.m.Lambert-St Louis
14h 41m
1 stop
YUL11:44 a.m.Montreal Pierre Elliott Trudeau Intl
C$ 449
American Airlines
2 May
YUL12:30 p.m.Montreal Pierre Elliott Trudeau Intl
8h 39m
1 stop
STL8:09 p.m.Lambert-St Louis
9 May
STL2:33 p.m.Lambert-St Louis
20h 11m
1 stop
YUL11:44 a.m.Montreal Pierre Elliott Trudeau Intl
C$ 539

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 22 March 2026.
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

Cheapest round-trip

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 5/5

12:30 p.m.-10:19 p.m.

1 stop10h 49m

Lambert-St Louis

Tue 12/5

8:03 p.m.-11:44 a.m.

1 stop14h 41m

C$ 432

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 15/4

12:30 p.m.-10:17 p.m.

1 stop10h 47m

Lambert-St Louis

Tue 21/4

8:03 p.m.-11:44 a.m.

1 stop14h 41m

C$ 449

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sat 2/5

12:30 p.m.-8:09 p.m.

1 stop8h 39m

Lambert-St Louis

Sat 9/5

2:33 p.m.-11:44 a.m.

1 stop20h 11m

C$ 539

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sat 2/5

1:03 p.m.-11:46 p.m.

2 stops11h 43m

Lambert-St Louis

Sat 9/5

5:21 p.m.-11:44 a.m.

1 stop17h 23m

C$ 553

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 5/5

9:15 a.m.-9:13 p.m.

2 stops12h 58m

Lambert-St Louis

Tue 12/5

7:45 a.m.-9:26 p.m.

1 stop12h 41m

C$ 582

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 19/4

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

2 stops23h 50m

Lambert-St Louis

Wed 22/4

4:59 p.m.-12:30 a.m.

1 stop30h 31m

C$ 617
Quickest round-trip

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 20/4

6:45 p.m.-11:36 p.m.

1 stop5h 51m

Lambert-St Louis

Sat 25/4

5:59 p.m.-11:08 p.m.

1 stop4h 09m

C$ 630

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 29/4

1:20 p.m.-11:11 p.m.

1 stop10h 51m

Lambert-St Louis

Sat 2/5

6:30 a.m.-5:30 p.m.

1 stop10h 00m

C$ 631

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 10/5

12:30 p.m.-10:19 p.m.

1 stop10h 49m

Lambert-St Louis

Sat 16/5

8:03 p.m.-11:44 a.m.

1 stop14h 41m

C$ 645

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 24/4

6:45 p.m.-11:36 p.m.

1 stop5h 51m

Lambert-St Louis

Sat 30/5

5:15 p.m.-11:57 p.m.

1 stop5h 42m

C$ 680

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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 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$ 392. If you don’t want to visit St. Louis in July, then you should wait until September to fly from Montreal, when ticket prices are also cheap, with an average price of C$ 576.

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

Our data shows that Wednesday is the least expensive day to fly to St. Louis. Tickets to fly out on this day can be as low as C$ 751. The most expensive day to fly to St. Louis is Saturday, with ticket prices averaging around C$ 918.

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 55% on your flight if you consider stops on a Montreal to St. Louis flight.

How have Montreal to St. Louis flight prices changed over time?

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, Wed, Fri, Sat and Sun

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, Wednesday, Friday, Saturday and Sunday. 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$ 594Free CancellationRating
7.1
10,830 reviews
Search Air Canada flights
WestJetPriceFrom C$ 735Free CancellationRating
7.2
3,300 reviews
Search WestJet flights

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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