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Cheap flights from Montreal to St. Louis from $219

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 pm - 10:19 pm
YUL
-
STL
10h 49m
1 stop
American Airlines Logo
8:03 pm - 11:44 am
STL
-
YUL
14h 41m
1 stop
$315American Airlines
Tue, May 5 - Tue, May 12
American Airlines Logo
12:30 pm - 10:17 pm
YUL
-
STL
10h 47m
1 stop
American Airlines Logo
8:03 pm - 11:44 am
STL
-
YUL
14h 41m
1 stop
$327American Airlines
Wed, Apr 15 - Tue, Apr 21
American Airlines Logo
12:30 pm - 8:09 pm
YUL
-
STL
8h 39m
1 stop
American Airlines Logo
2:33 pm - 11:44 am
STL
-
YUL
20h 11m
1 stop
$393American Airlines
Sat, May 2 - Sat, May 9
American Airlines Logo
1:03 pm - 11:46 pm
YUL
-
STL
11h 43m
2 stops
American Airlines Logo
5:21 pm - 11:44 am
STL
-
YUL
17h 23m
1 stop
$403American Airlines
Sat, May 2 - Sat, May 9
United Airlines Logo
9:15 am - 9:13 pm
YUL
-
STL
12h 58m
2 stops
United Airlines Logo
7:45 am - 9:26 pm
STL
-
YUL
12h 41m
1 stop
$424United Airlines
Tue, May 5 - Tue, May 12
Multiple Airlines Logo
8:00 am - 6:50 am
YUL
-
STL
23h 50m
2 stops
Multiple Airlines Logo
4:59 pm - 12:30 am
STL
-
YUL
30h 31m
1 stop
$450Multiple Airlines
Sun, Apr 19 - Wed, Apr 22
Delta Logo
6:45 pm - 11:36 pm
YUL
-
STL
5h 51m
1 stop
Delta Logo
5:59 pm - 11:08 pm
STL
-
YUL
4h 09m
1 stop
$459Delta
Mon, Apr 20 - Sat, Apr 25
United Airlines Logo
1:20 pm - 11:11 pm
YUL
-
STL
10h 51m
1 stop
United Airlines Logo
6:30 am - 5:30 pm
STL
-
YUL
10h 00m
1 stop
$460United Airlines
Wed, Apr 29 - Sat, May 2
American Airlines Logo
12:30 pm - 10:19 pm
YUL
-
STL
10h 49m
1 stop
American Airlines Logo
8:03 pm - 11:44 am
STL
-
YUL
14h 41m
1 stop
$470American Airlines
Sun, May 10 - Sat, May 16
Delta Logo
6:45 pm - 11:36 pm
YUL
-
STL
5h 51m
1 stop
Delta Logo
5:15 pm - 11:57 pm
STL
-
YUL
5h 42m
1 stop
$496Delta
Fri, Apr 24 - Sat, May 30

American Airlines flights from Montreal to St. Louis

Our best American Airlines deals on Montreal to St. Louis flight tickets
American Airlines
May 5
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
10h 49m
1 stop
STL10:19 pmLambert-St Louis
May 12
STL8:03 pmLambert-St Louis
14h 41m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
$315
American Airlines
Apr 15
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
10h 47m
1 stop
STL10:17 pmLambert-St Louis
Apr 21
STL8:03 pmLambert-St Louis
14h 41m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
$327
American Airlines
May 2
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
8h 39m
1 stop
STL8:09 pmLambert-St Louis
May 9
STL2:33 pmLambert-St Louis
20h 11m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
$393

WestJet flights from Montreal to St. Louis

Our best WestJet deals on Montreal to St. Louis flight tickets
WestJet
May 8
YUL5:06 pmMontreal Pierre Elliott Trudeau Intl
5h 03m
1 stop
STL9:09 pmLambert-St Louis
May 11
STL5:15 pmLambert-St Louis
5h 42m
1 stop
YUL11:57 pmMontreal Pierre Elliott Trudeau Intl
$531
WestJet
May 10
YUL7:00 amMontreal Pierre Elliott Trudeau Intl
6h 20m
1 stop
STL12:20 pmLambert-St Louis
May 16
STL6:04 pmLambert-St Louis
23h 16m
2 stops
YUL6:20 pmMontreal Pierre Elliott Trudeau Intl
$549
WestJet
May 10
YUL6:45 amMontreal Pierre Elliott Trudeau Intl
15h 24m
2 stops
STL9:09 pmLambert-St Louis
May 16
STL6:04 pmLambert-St Louis
23h 16m
2 stops
YUL6:20 pmMontreal Pierre Elliott Trudeau Intl
$557

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 March 23, 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 pm-10:19 pm

1 stop10h 49m

Lambert-St Louis

Tue 5/12

8:03 pm-11:44 am

1 stop14h 41m

$315

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 4/15

12:30 pm-10:17 pm

1 stop10h 47m

Lambert-St Louis

Tue 4/21

8:03 pm-11:44 am

1 stop14h 41m

$327

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sat 5/2

12:30 pm-8:09 pm

1 stop8h 39m

Lambert-St Louis

Sat 5/9

2:33 pm-11:44 am

1 stop20h 11m

$393

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sat 5/2

1:03 pm-11:46 pm

2 stops11h 43m

Lambert-St Louis

Sat 5/9

5:21 pm-11:44 am

1 stop17h 23m

$403

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 5/5

9:15 am-9:13 pm

2 stops12h 58m

Lambert-St Louis

Tue 5/12

7:45 am-9:26 pm

1 stop12h 41m

$424

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 4/19

8:00 am-6:50 am

2 stops23h 50m

Lambert-St Louis

Wed 4/22

4:59 pm-12:30 am

1 stop30h 31m

$450
Quickest round-trip

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 4/20

6:45 pm-11:36 pm

1 stop5h 51m

Lambert-St Louis

Sat 4/25

5:59 pm-11:08 pm

1 stop4h 09m

$459

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 4/29

1:20 pm-11:11 pm

1 stop10h 51m

Lambert-St Louis

Sat 5/2

6:30 am-5:30 pm

1 stop10h 00m

$460

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 5/10

12:30 pm-10:19 pm

1 stop10h 49m

Lambert-St Louis

Sat 5/16

8:03 pm-11:44 am

1 stop14h 41m

$470

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 4/24

6:45 pm-11:36 pm

1 stop5h 51m

Lambert-St Louis

Sat 5/30

5:15 pm-11:57 pm

1 stop5h 42m

$496

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 September is another great option to travel to St. Louis, with average flight prices from Montreal averaging around $420.

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 Tuesday when prices can be found for as low as $326. 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 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 2 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 10% 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

Best Price Found

$508

Fastest flight time

2h 55m

Direct flights

Mon, Wed, Thu, 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 $508
The fastest flight from Montreal to St. Louis takes 2h 55m
Direct flights go from Montreal to St. Louis on Monday, Wednesday, Thursday, Saturday and Sunday. There are no airlines offering direct flights.
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?

    A flight from Montreal to Lambert-St Louis will travel around 973.0 mi. Typically, this will take 2h 55m 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 $499Free CancellationRating
7.1
10,834 reviews
Search Air Canada 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
Florissant
Maryland Heights
O'Fallon
Collinsville
St. Peters
Wentzville
Alton
Fenton
Farmington
Clayton
Festus
Edwardsville
Eureka
Litchfield
Shrewsbury
Grafton

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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