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Cheap flights from Montreal to St. Louis from $227

1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

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
1:04 pm - 11:59 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
11h 55m2 stops Philadelphia Chicago O'Hare Intl
American Airlines Logo
8:15 pm - 11:25 amSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
14h 10m1 stop Chicago O'Hare Intl
$422American Airlines
Sat, Nov 7 - Mon, Nov 9
American Airlines Logo
12:10 pm - 8:04 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
8h 54m1 stop Chicago O'Hare Intl
American Airlines Logo
7:26 am - 9:26 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
13h 00m2 stops Chicago O'Hare Intl Philadelphia
$461American Airlines
Thu, Nov 19 - Sat, Nov 21
American Airlines Logo
10:32 am - 8:52 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
11h 20m1 stop New York LaGuardia
American Airlines Logo
5:00 am - 4:52 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
10h 52m1 stop Chicago O'Hare Intl
$466American Airlines
Tue, Oct 20 - Sat, Oct 24
American Airlines Logo
10:32 am - 8:52 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
11h 20m1 stop New York LaGuardia
American Airlines Logo
5:23 pm - 11:44 amSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
17h 21m1 stop Chicago O'Hare Intl
$466American Airlines
Tue, Oct 13 - Sat, Oct 17
American Airlines Logo
10:32 am - 8:52 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
11h 20m1 stop New York LaGuardia
American Airlines Logo
5:00 am - 4:52 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
10h 52m1 stop Chicago O'Hare Intl
$467American Airlines
Tue, Oct 20 - Sat, Oct 24
American Airlines Logo
12:10 pm - 11:59 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
12h 49m1 stop Chicago O'Hare Intl
American Airlines Logo
8:15 pm - 11:25 amSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
14h 10m1 stop Chicago O'Hare Intl
$470American Airlines
Sat, Nov 7 - Mon, Nov 9
American Airlines Logo
12:10 pm - 11:59 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
12h 49m1 stop Chicago O'Hare Intl
American Airlines Logo
8:15 pm - 11:25 amSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
14h 10m1 stop Chicago O'Hare Intl
$479American Airlines
Mon, Nov 2 - Mon, Nov 9
American Airlines Logo
10:32 am - 8:52 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
11h 20m1 stop New York LaGuardia
American Airlines Logo
5:29 pm - 11:25 amSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
16h 56m1 stop Chicago O'Hare Intl
$498American Airlines
Fri, Oct 23 - Tue, Nov 3
Air Canada Logo
4:55 pm - 6:41 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
2h 46mnonstop
Air Canada Logo
12:10 pm - 3:41 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
2h 31mnonstop
$619Air Canada
Thu, Oct 15 - Sun, Oct 18
Air Canada Logo
8:35 am - 2:00 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
6h 25m2 stops Ottawa Toronto Pearson Intl
Air Canada Logo
12:10 pm - 3:41 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
2h 31mnonstop
$622Air Canada
Thu, Oct 15 - Sun, Oct 18

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Air Canada flights from Montreal to St. Louis

Our best Air Canada deals on Montreal to St. Louis flight tickets
Air Canada
Oct 15
YUL4:55 pmMontreal Pierre Elliott Trudeau Intl
2h 46m
STL6:41 pmLambert-St Louis
Oct 18
STL12:10 pmLambert-St Louis
2h 31m
YUL3:41 pmMontreal Pierre Elliott Trudeau Intl
$619
Air Canada
Oct 15
YUL8:35 amMontreal Pierre Elliott Trudeau Intl
6h 25m
2 stops
STL2:00 pmLambert-St Louis
Oct 18
STL12:10 pmLambert-St Louis
2h 31m
YUL3:41 pmMontreal Pierre Elliott Trudeau Intl
$622
Air Canada
Oct 15
YUL9:10 amMontreal Pierre Elliott Trudeau Intl
5h 50m
1 stop
STL2:00 pmLambert-St Louis
Oct 18
STL12:10 pmLambert-St Louis
2h 31m
YUL3:41 pmMontreal Pierre Elliott Trudeau Intl
$623

American Airlines flights from Montreal to St. Louis

Our best American Airlines deals on Montreal to St. Louis flight tickets
American Airlines
Nov 19
YUL12:10 pmMontreal Pierre Elliott Trudeau Intl
8h 54m
1 stop
STL8:04 pmLambert-St Louis
Nov 21
STL7:26 amLambert-St Louis
13h 00m
2 stops
YUL9:26 pmMontreal Pierre Elliott Trudeau Intl
$461
American Airlines
Oct 13
YUL10:32 amMontreal Pierre Elliott Trudeau Intl
11h 20m
1 stop
STL8:52 pmLambert-St Louis
Oct 17
STL5:23 pmLambert-St Louis
17h 21m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
$466
American Airlines
Oct 20
YUL10:32 amMontreal Pierre Elliott Trudeau Intl
11h 20m
1 stop
STL8:52 pmLambert-St Louis
Oct 24
STL5:00 amLambert-St Louis
10h 52m
1 stop
YUL4:52 pmMontreal Pierre Elliott Trudeau Intl
$467

momondo Fare Finder

 
Use the filters below to find and compare flights from Montreal to St. Louis that are best for you.

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Route

Depart

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Price

Cheapest round-trip

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sat 11/7

1:04 pm-11:59 pm

2 stops11h 55m

Lambert-St Louis

Mon 11/9

8:15 pm-11:25 am

1 stop14h 10m

$422

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 11/19

12:10 pm-8:04 pm

1 stop8h 54m

Lambert-St Louis

Sat 11/21

7:26 am-9:26 pm

2 stops13h 00m

$461

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 10/20

10:32 am-8:52 pm

1 stop11h 20m

Lambert-St Louis

Sat 10/24

5:00 am-4:52 pm

1 stop10h 52m

$466

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 10/13

10:32 am-8:52 pm

1 stop11h 20m

Lambert-St Louis

Sat 10/17

5:23 pm-11:44 am

1 stop17h 21m

$466

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 10/20

10:32 am-8:52 pm

1 stop11h 20m

Lambert-St Louis

Sat 10/24

5:00 am-4:52 pm

1 stop10h 52m

$467

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sat 11/7

12:10 pm-11:59 pm

1 stop12h 49m

Lambert-St Louis

Mon 11/9

8:15 pm-11:25 am

1 stop14h 10m

$470

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 11/2

12:10 pm-11:59 pm

1 stop12h 49m

Lambert-St Louis

Mon 11/9

8:15 pm-11:25 am

1 stop14h 10m

$479

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 10/23

10:32 am-8:52 pm

1 stop11h 20m

Lambert-St Louis

Tue 11/3

5:29 pm-11:25 am

1 stop16h 56m

$498
Quickest round-trip

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 10/15

4:55 pm-6:41 pm

Nonstop2h 46m

Lambert-St Louis

Sun 10/18

12:10 pm-3:41 pm

Nonstop2h 31m

$619

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 10/15

8:35 am-2:00 pm

2 stops6h 25m

Lambert-St Louis

Sun 10/18

12:10 pm-3:41 pm

Nonstop2h 31m

$622

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?

In general, August 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 $442. The month of May is another great option to travel to St. Louis, with average flight prices from Montreal averaging around $548.

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 Thursday when prices can be found for as low as $538. 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 Friday because tickets tend to average around $690. 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 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 St. Louis flights?

There is only 1 cabin class available to choose from on Montreal to 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 8% 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

$227

Fastest flight time

2h 46m

Direct flights

Tue, Wed, Fri and Sun

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Montreal in the past 72 hours is $227. The best round-trip flight deal from Montreal to St. Louis found on momondo in the last 72 hours is $422.
The fastest flight from Montreal to St. Louis takes 2h 46m
Direct flights go from Montreal to St. Louis on Tuesday, Wednesday, Friday 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

Frequently asked questions about flying from Montreal to St. Louis

  • 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 46m 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?

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 $478Free CancellationRating
7.1
11,668 reviews
Search Air Canada 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 $478. 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
Fairview Heights
Maryland Heights
St. Peters
Alton
Collinsville
Florissant
Hermann
Clayton
O'Fallon
Farmington
Festus
Fenton
Edwardsville
Wentzville
Eureka
Litchfield
Grafton
Waterloo

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.

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