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Cheap flights from Montreal to St. Louis from $216

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 12/13. 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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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
3:49 pm - 8:09 amYUL-STL
17h 20m1 stop
American Airlines Logo
5:05 am - 3:10 pmSTL-YUL
9h 05m1 stop
$446American Airlines
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Wed, Nov 26 - Wed, Dec 3
Multiple Airlines Logo
4:35 pm - 9:40 amYUL-STL
18h 05m1 stop
Multiple Airlines Logo
10:53 am - 4:55 pmSTL-YUL
29h 02m2 stops
$450Multiple Airlines
Find Deal
Sun, Nov 16 - Thu, Nov 27
American Airlines Logo
3:49 pm - 8:09 amYUL-STL
17h 20m1 stop
American Airlines Logo
5:05 am - 10:40 pmSTL-YUL
16h 35m2 stops
$472American Airlines
Find Deal
Wed, Nov 26 - Wed, Dec 3
Multiple Airlines Logo
4:35 pm - 9:40 amYUL-STL
18h 05m1 stop
Multiple Airlines Logo
3:30 pm - 10:25 pmSTL-YUL
29h 55m2 stops
$508Multiple Airlines
Find Deal
Sun, Nov 16 - Wed, Dec 3
Delta Logo
7:00 am - 4:07 pmYUL-STL
10h 07m1 stop
Delta Logo
5:34 pm - 11:47 pmSTL-YUL
5h 13m1 stop
$526Delta
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Tue, Nov 25 - Tue, Dec 2
United Airlines Logo
6:15 pm - 2:22 pmYUL-STL
21h 07m1 stop
United Airlines Logo
6:43 pm - 10:10 amSTL-YUL
14h 27m1 stop
$552United Airlines
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Wed, Nov 26 - Sun, Nov 30
Delta Logo
6:00 am - 1:25 pmYUL-STL
8h 25m1 stop
Delta Logo
5:30 pm - 11:39 pmSTL-YUL
5h 09m1 stop
$553Delta
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Tue, Apr 7 - Wed, Apr 8
United Airlines Logo
7:00 am - 3:46 pmYUL-STL
9h 46m2 stops
United Airlines Logo
12:55 pm - 7:48 pmSTL-YUL
5h 53m1 stop
$556United Airlines
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Tue, Nov 25 - Tue, Dec 2
Air Canada Logo
8:50 am - 3:29 pmYUL-STL
7h 39m2 stops
Air Canada Logo
4:05 pm - 8:22 amSTL-YUL
15h 17m1 stop
$741Air Canada
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Wed, Nov 26 - Sun, Nov 30
Air Canada Logo
8:50 am - 3:29 pmYUL-STL
7h 39m2 stops
Air Canada Logo
5:24 pm - 1:53 amSTL-YUL
7h 29m2 stops
$935Air Canada
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Fri, Nov 14 - Sun, Nov 16

WestJet flights from Montreal to St. Louis

Our best WestJet deals on Montreal to St. Louis flight tickets
WestJet
Dec 19
YUL7:10 amMontreal Pierre Elliott Trudeau Intl
29h 02m
1 stop
STL11:12 amLambert-St Louis
Jan 3
STL6:29 amLambert-St Louis
15h 50m
1 stop
YUL11:19 pmMontreal Pierre Elliott Trudeau Intl
$677
Find similar
WestJet
Dec 19
YUL7:10 amMontreal Pierre Elliott Trudeau Intl
17h 17m
1 stop
STL11:27 pmLambert-St Louis
Jan 3
STL7:10 amLambert-St Louis
16h 33m
2 stops
YUL12:43 amMontreal Pierre Elliott Trudeau Intl
$684
Find similar
WestJet
Dec 19
YUL12:40 pmMontreal Pierre Elliott Trudeau Intl
10h 38m
1 stop
STL10:18 pmLambert-St Louis
Jan 3
STL7:10 amLambert-St Louis
16h 33m
2 stops
YUL12:43 amMontreal Pierre Elliott Trudeau Intl
$686
Find similar

Delta flights from Montreal to St. Louis

Our best Delta deals on Montreal to St. Louis flight tickets
Delta
Nov 25
YUL7:00 amMontreal Pierre Elliott Trudeau Intl
10h 07m
1 stop
STL4:07 pmLambert-St Louis
Dec 2
STL5:34 pmLambert-St Louis
5h 13m
1 stop
YUL11:47 pmMontreal Pierre Elliott Trudeau Intl
$526
Find similar
Delta
Apr 7
YUL6:00 amMontreal Pierre Elliott Trudeau Intl
8h 25m
1 stop
STL1:25 pmLambert-St Louis
Apr 8
STL5:30 pmLambert-St Louis
5h 09m
1 stop
YUL11:39 pmMontreal Pierre Elliott Trudeau Intl
$553
Find similar
Delta
Apr 7
YUL6:00 amMontreal Pierre Elliott Trudeau Intl
8h 25m
1 stop
STL1:25 pmLambert-St Louis
Apr 8
STL2:18 pmLambert-St Louis
7h 54m
1 stop
YUL11:12 pmMontreal Pierre Elliott Trudeau Intl
$554
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 832,500 searches. Data last updated October 30, 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 11/26

3:49 pm-8:09 am

1 stop17h 20m

Lambert-St Louis

Wed 12/3

5:05 am-3:10 pm

1 stop9h 05m

$446

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 11/16

4:35 pm-9:40 am

1 stop18h 05m

Lambert-St Louis

Thu 11/27

10:53 am-4:55 pm

2 stops29h 02m

$450

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 11/26

3:49 pm-8:09 am

1 stop17h 20m

Lambert-St Louis

Wed 12/3

5:05 am-10:40 pm

2 stops16h 35m

$472

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 11/16

4:35 pm-9:40 am

1 stop18h 05m

Lambert-St Louis

Wed 12/3

3:30 pm-10:25 pm

2 stops29h 55m

$508

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 11/25

7:00 am-4:07 pm

1 stop10h 07m

Lambert-St Louis

Tue 12/2

5:34 pm-11:47 pm

1 stop5h 13m

$526

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 11/26

6:15 pm-2:22 pm

1 stop21h 07m

Lambert-St Louis

Sun 11/30

6:43 pm-10:10 am

1 stop14h 27m

$552

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 4/7

6:00 am-1:25 pm

1 stop8h 25m

Lambert-St Louis

Wed 4/8

5:30 pm-11:39 pm

1 stop5h 09m

$553

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 11/25

7:00 am-3:46 pm

2 stops9h 46m

Lambert-St Louis

Tue 12/2

12:55 pm-7:48 pm

1 stop5h 53m

$556

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 11/26

8:50 am-3:29 pm

2 stops7h 39m

Lambert-St Louis

Sun 11/30

4:05 pm-8:22 am

1 stop15h 17m

$741

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 11/14

8:50 am-3:29 pm

2 stops7h 39m

Lambert-St Louis

Sun 11/16

5:24 pm-1:53 am

2 stops7h 29m

$935

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 typical price of a round-trip flight between Montreal and St. Louis?

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

In general, July is the cheapest month to fly from Montreal to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $286. The month of February is another great option to travel to St. Louis, with average flight prices from Montreal averaging around $455.

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

The cheapest day to depart on your flight to St. Louis is on a Friday when prices can be found for as low as $246. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around $609. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

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

Flying to St. Louis from Montreal in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $435 when looking at flights departing in the afternoon. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $593 per ticket.

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 are 3 cabin classes 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

Direct flights

None
There are no direct flights from Montreal to St. Louis. There are no popular flight routes from Montreal to St. Louis.
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  • How far is Montreal to Lambert-St Louis by plane?

    A flight from Montreal to Lambert-St Louis will travel around 973.0 mi. Typically, this will take 6h 12m by plane in normal conditions.

  • 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 were last updated today.

  • 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?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to 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 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 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 $435Free CancellationRating
7.1
10,377 reviews
Search Air Canada flights
DeltaPriceFrom $452Free CancellationRating
7.9
7,993 reviews
Search Delta flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
Florissant
O'Fallon
Wentzville
Fenton
Collinsville
St. Peters
Alton
Farmington
Festus
Glencoe
Edwardsville
Clayton
Eureka
Litchfield
Shrewsbury

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Montreal to St. Louis. Millions of users trust and use momondo every year so you are in good hands.

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

Yes. momondo allows you to filter the results for Montreal to St. Louis flights to just show those with flexible booking policies.

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.

An easier way to manage your St. Louis trip

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