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Cheap flights from Montreal to St. Louis from $195

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 10/1. 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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0 bags

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Cheap round-trip flights

American Airlines Logo
7:50 am - 6:20 pmYUL-STL
11h 30m2 stops
American Airlines Logo
5:40 pm - 3:11 pmSTL-YUL
20h 31m1 stop
$363American Airlines
Find Deal
Wed, Oct 29 - Wed, Nov 5
American Airlines Logo
7:50 am - 6:20 pmYUL-STL
11h 30m2 stops
American Airlines Logo
6:00 am - 10:39 pmSTL-YUL
15h 39m2 stops
$366American Airlines
Find Deal
Tue, Oct 28 - Tue, Nov 4
United Airlines Logo
6:15 pm - 12:28 pmYUL-STL
19h 13m1 stop
United Airlines Logo
10:00 am - 6:40 pmSTL-YUL
7h 40m1 stop
$450United Airlines
Find Deal
Tue, Oct 28 - Tue, Nov 4
Logo
5:10 pm - 10:12 amYUL-STL
18h 02m2 stops
Logo
12:20 pm - 3:10 pmSTL-YUL
25h 50m1 stop
$451
Find Deal
Sat, Nov 8 - Sun, Nov 16
Delta Logo
7:30 pm - 8:13 amYUL-STL
13h 43m1 stop
Delta Logo
9:35 am - 6:40 pmSTL-YUL
8h 05m1 stop
$465Delta
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Wed, Nov 5 - Wed, Nov 12
Delta Logo
7:30 pm - 8:13 amYUL-STL
13h 43m1 stop
Delta Logo
5:34 pm - 11:42 pmSTL-YUL
5h 08m1 stop
$473Delta
Find Deal
Wed, Nov 5 - Wed, Nov 12
United Airlines Logo
6:00 am - 3:49 pmYUL-STL
10h 49m1 stop
United Airlines Logo
6:30 am - 3:57 pmSTL-YUL
8h 27m1 stop
$479United Airlines
Find Deal
Wed, Oct 29 - Wed, Nov 5
Logo
6:00 am - 8:40 amYUL-STL
27h 40m3 stops
Logo
10:35 am - 12:27 amSTL-YUL
12h 52m2 stops
$512
Find Deal
Tue, Sep 30 - Thu, Oct 2
Air Canada Logo
9:15 am - 3:18 pmYUL-STL
7h 03m1 stop
Air Canada Logo
9:15 am - 5:20 pmSTL-YUL
7h 05m1 stop
$517Air Canada
Find Deal
Thu, Oct 9 - Mon, Oct 13
Air Canada Logo
9:15 am - 3:18 pmYUL-STL
7h 03m1 stop
Air Canada Logo
9:15 am - 9:46 pmSTL-YUL
11h 31m2 stops
$520Air Canada
Find Deal
Thu, Oct 9 - Mon, Oct 13

American Airlines flights from Montreal to St. Louis

Our best American Airlines deals on Montreal to St. Louis flight tickets
American Airlines
Oct 29
YUL7:50 amMontreal Pierre Elliott Trudeau Intl
11h 30m
2 stops
STL6:20 pmLambert-St Louis
Nov 5
STL5:40 pmLambert-St Louis
20h 31m
1 stop
YUL3:11 pmMontreal Pierre Elliott Trudeau Intl
$363
Find similar
American Airlines
Oct 28
YUL7:50 amMontreal Pierre Elliott Trudeau Intl
11h 30m
2 stops
STL6:20 pmLambert-St Louis
Nov 4
STL6:00 amLambert-St Louis
15h 39m
2 stops
YUL10:39 pmMontreal Pierre Elliott Trudeau Intl
$366
Find similar
American Airlines
Oct 28
YUL7:50 amMontreal Pierre Elliott Trudeau Intl
11h 30m
2 stops
STL6:20 pmLambert-St Louis
Nov 4
STL6:00 amLambert-St Louis
15h 39m
2 stops
YUL10:39 pmMontreal Pierre Elliott Trudeau Intl
$367
Find similar

United Airlines flights from Montreal to St. Louis

Our best United Airlines deals on Montreal to St. Louis flight tickets
United Airlines
Oct 28
YUL6:15 pmMontreal Pierre Elliott Trudeau Intl
19h 13m
1 stop
STL12:28 pmLambert-St Louis
Nov 4
STL10:00 amLambert-St Louis
7h 40m
1 stop
YUL6:40 pmMontreal Pierre Elliott Trudeau Intl
$450
Find similar
United Airlines
Oct 29
YUL6:00 amMontreal Pierre Elliott Trudeau Intl
10h 49m
1 stop
STL3:49 pmLambert-St Louis
Nov 5
STL6:30 amLambert-St Louis
8h 27m
1 stop
YUL3:57 pmMontreal Pierre Elliott Trudeau Intl
$479
Find similar
United Airlines
Nov 8
YUL2:13 pmMontreal Pierre Elliott Trudeau Intl
9h 32m
2 stops
STL10:45 pmLambert-St Louis
Nov 16
STL6:30 amLambert-St Louis
7h 46m
2 stops
YUL3:16 pmMontreal Pierre Elliott Trudeau Intl
$523
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 September 15, 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 10/29

7:50 am-6:20 pm

2 stops11h 30m

Lambert-St Louis

Wed 11/5

5:40 pm-3:11 pm

1 stop20h 31m

$363

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 10/28

7:50 am-6:20 pm

2 stops11h 30m

Lambert-St Louis

Tue 11/4

6:00 am-10:39 pm

2 stops15h 39m

$366

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 10/28

6:15 pm-12:28 pm

1 stop19h 13m

Lambert-St Louis

Tue 11/4

10:00 am-6:40 pm

1 stop7h 40m

$450

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sat 11/8

5:10 pm-10:12 am

2 stops18h 02m

Lambert-St Louis

Sun 11/16

12:20 pm-3:10 pm

1 stop25h 50m

$451

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 11/5

7:30 pm-8:13 am

1 stop13h 43m

Lambert-St Louis

Wed 11/12

9:35 am-6:40 pm

1 stop8h 05m

$465

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 11/5

7:30 pm-8:13 am

1 stop13h 43m

Lambert-St Louis

Wed 11/12

5:34 pm-11:42 pm

1 stop5h 08m

$473

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 10/29

6:00 am-3:49 pm

1 stop10h 49m

Lambert-St Louis

Wed 11/5

6:30 am-3:57 pm

1 stop8h 27m

$479

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 9/30

6:00 am-8:40 am

3 stops27h 40m

Lambert-St Louis

Thu 10/2

10:35 am-12:27 am

2 stops12h 52m

$512

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 10/9

9:15 am-3:18 pm

1 stop7h 03m

Lambert-St Louis

Mon 10/13

9:15 am-5:20 pm

1 stop7h 05m

$517

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 10/9

9:15 am-3:18 pm

1 stop7h 03m

Lambert-St Louis

Mon 10/13

9:15 am-9:46 pm

2 stops11h 31m

$520

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 $256. 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 evening is the least expensive time of day to depart. momondo users have found prices as low as $282 when looking at flights departing in the evening. 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 20% 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

Best Price Found

$1,065

Fastest flight time

2h 47m

Direct flights

Mon, Tue, Wed, Fri, Sat and Sun

Airports in St. Louis

1 airport
The best flight deal from Montreal to St. Louis found on momondo in the last 72 hours is $1,065
The fastest flight from Montreal to St. Louis takes 2h 47m
Direct flights go from Montreal to St. Louis on Monday, Tuesday, Wednesday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
There is 1 airport near St. Louis: Lambert-St Louis (STL)
Search flight deals

  • 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 2h 47m 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
10,000 reviews
Search Air Canada flights
DeltaPriceFrom $452Free CancellationRating
7.9
7,954 reviews
Search Delta flights

  • Air Canada Flights From Montreal to St. Louis

    The lowest priced Air Canada flight from Montreal to St. Louis from the last 72 hours was $435. Generally, Air Canada has 7 flights on this route every week with an average price of $561. Air Canada is rated 7.1/10 by our users.

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
Florissant
Maryland Heights
O'Fallon
Fenton
Collinsville
Wentzville
Alton
St. Peters
Farmington
Festus
Glencoe
Clayton
Edwardsville
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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