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Cheap flights from St. Louis to Montreal from $160

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Montreal departing on 3/23. 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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Find the cheapest flights from St. Louis to Montreal

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
8:00 am - 2:58 pm
STL
-
YUL
5h 58m
1 stop
American Airlines Logo
7:29 am - 1:22 pm
YUL
-
STL
6h 53m
1 stop
$238American Airlines
Sun, Apr 5 - Sun, Apr 12
American Airlines Logo
6:00 am - 2:58 pm
STL
-
YUL
7h 58m
1 stop
American Airlines Logo
12:30 pm - 10:17 pm
YUL
-
STL
10h 47m
1 stop
$305American Airlines
Wed, Apr 1 - Wed, Apr 8
American Airlines Logo
5:51 am - 11:44 am
STL
-
YUL
4h 53m
1 stop
American Airlines Logo
2:32 pm - 7:30 pm
YUL
-
STL
5h 58m
1 stop
$307American Airlines
Tue, Apr 21 - Tue, Apr 28
American Airlines Logo
10:33 am - 10:48 pm
STL
-
YUL
11h 15m
2 stops
American Airlines Logo
12:30 pm - 11:46 pm
YUL
-
STL
12h 16m
1 stop
$315American Airlines
Wed, Apr 1 - Wed, Apr 8
American Airlines Logo
8:03 pm - 11:44 am
STL
-
YUL
14h 41m
1 stop
American Airlines Logo
12:30 pm - 10:19 pm
YUL
-
STL
10h 49m
1 stop
$316American Airlines
Wed, Apr 29 - Sun, May 3
American Airlines Logo
10:33 am - 10:48 pm
STL
-
YUL
11h 15m
2 stops
American Airlines Logo
1:03 pm - 11:46 pm
YUL
-
STL
11h 43m
2 stops
$321American Airlines
Wed, Apr 1 - Wed, Apr 8
American Airlines Logo
6:00 am - 2:58 pm
STL
-
YUL
7h 58m
1 stop
American Airlines Logo
12:30 pm - 11:46 pm
YUL
-
STL
12h 16m
1 stop
$326American Airlines
Sun, Apr 5 - Sun, Apr 12
American Airlines Logo
9:20 am - 10:56 pm
STL
-
YUL
12h 36m
2 stops
American Airlines Logo
12:30 pm - 11:46 pm
YUL
-
STL
12h 16m
1 stop
$336American Airlines
Sun, Apr 5 - Sun, Apr 12
American Airlines Logo
6:33 pm - 11:44 am
STL
-
YUL
16h 11m
1 stop
American Airlines Logo
12:30 pm - 10:17 pm
YUL
-
STL
10h 47m
1 stop
$356American Airlines
Mon, Apr 6 - Mon, Apr 13
American Airlines Logo
5:51 am - 10:58 pm
STL
-
YUL
16h 07m
2 stops
American Airlines Logo
12:30 pm - 11:46 pm
YUL
-
STL
12h 16m
1 stop
$371American Airlines
Tue, Apr 21 - Sun, Apr 26

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
Apr 5
STL8:00 amLambert-St Louis
5h 58m
1 stop
YUL2:58 pmMontreal Pierre Elliott Trudeau Intl
Apr 12
YUL7:29 amMontreal Pierre Elliott Trudeau Intl
6h 53m
1 stop
STL1:22 pmLambert-St Louis
$238
American Airlines
Apr 1
STL6:00 amLambert-St Louis
7h 58m
1 stop
YUL2:58 pmMontreal Pierre Elliott Trudeau Intl
Apr 8
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
10h 47m
1 stop
STL10:17 pmLambert-St Louis
$305
American Airlines
Apr 21
STL4:30 pmLambert-St Louis
18h 14m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
Apr 27
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
10h 47m
1 stop
STL10:17 pmLambert-St Louis
$307

Air Canada flights from St. Louis to Montreal

Our best Air Canada deals on St. Louis to Montreal flight tickets
Air Canada
Apr 7
STL9:10 amLambert-St Louis
8h 45m
1 stop
YUL6:55 pmMontreal Pierre Elliott Trudeau Intl
Apr 14
YUL6:10 amMontreal Pierre Elliott Trudeau Intl
15h 58m
1 stop
STL9:08 pmLambert-St Louis
$418
Air Canada
Jun 5
STL7:30 amLambert-St Louis
6h 51m
1 stop
YUL3:21 pmMontreal Pierre Elliott Trudeau Intl
Jun 5
YUL6:10 pmMontreal Pierre Elliott Trudeau Intl
2h 55m
STL8:05 pmLambert-St Louis
$563
Air Canada
Jun 16
STL1:00 pmLambert-St Louis
2h 35m
YUL4:35 pmMontreal Pierre Elliott Trudeau Intl
Jun 23
YUL6:10 pmMontreal Pierre Elliott Trudeau Intl
2h 55m
STL8:05 pmLambert-St Louis
$580

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Montreal 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 February 22, 2026.
Use the filters below to find and compare flights from St. Louis to Montreal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 4/5

8:00 am-2:58 pm

1 stop5h 58m

Montreal Pierre Elliott Trudeau Intl

Sun 4/12

7:29 am-1:22 pm

1 stop6h 53m

$238

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 4/1

6:00 am-2:58 pm

1 stop7h 58m

Montreal Pierre Elliott Trudeau Intl

Wed 4/8

12:30 pm-10:17 pm

1 stop10h 47m

$305

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 4/21

5:51 am-11:44 am

1 stop4h 53m

Montreal Pierre Elliott Trudeau Intl

Tue 4/28

2:32 pm-7:30 pm

1 stop5h 58m

$307

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 4/1

10:33 am-10:48 pm

2 stops11h 15m

Montreal Pierre Elliott Trudeau Intl

Wed 4/8

12:30 pm-11:46 pm

1 stop12h 16m

$315

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 4/29

8:03 pm-11:44 am

1 stop14h 41m

Montreal Pierre Elliott Trudeau Intl

Sun 5/3

12:30 pm-10:19 pm

1 stop10h 49m

$316

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 4/1

10:33 am-10:48 pm

2 stops11h 15m

Montreal Pierre Elliott Trudeau Intl

Wed 4/8

1:03 pm-11:46 pm

2 stops11h 43m

$321

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 4/5

6:00 am-2:58 pm

1 stop7h 58m

Montreal Pierre Elliott Trudeau Intl

Sun 4/12

12:30 pm-11:46 pm

1 stop12h 16m

$326

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 4/5

9:20 am-10:56 pm

2 stops12h 36m

Montreal Pierre Elliott Trudeau Intl

Sun 4/12

12:30 pm-11:46 pm

1 stop12h 16m

$336

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 4/6

6:33 pm-11:44 am

1 stop16h 11m

Montreal Pierre Elliott Trudeau Intl

Mon 4/13

12:30 pm-10:17 pm

1 stop10h 47m

$356

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 4/21

5:51 am-10:58 pm

2 stops16h 07m

Montreal Pierre Elliott Trudeau Intl

Sun 4/26

12:30 pm-11:46 pm

1 stop12h 16m

$371

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 Montreal from

How to get the cheapest flight ticket from St. Louis to Montreal

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 day to depart on your flight to Montreal?

The cheapest day to depart from St. Louis to Montreal is on a Monday when prices can be found for as low as $994. Flights from St. Louis to Montreal on a Friday will generally be more expensive and average around $1,168. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Montreal?

Our most recent data shows that the best time of day to fly to Montreal is in the morning. Flights from St. Louis to Montreal during this time can be as low as $996. At noon is when there is more demand to fly to Montreal, so prices are often more expensive at around $1,061 per ticket.

What is the cheapest Lambert-St Louis to Montreal flight route?

Fly from Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl for the best Lambert-St Louis - Montreal flight prices

What cabin class options are available on Lambert-St Louis to Montreal flights?

There are 3 cabin classes available to choose from on Lambert-St Louis to Montreal 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 St. Louis to Montreal flights?

You could potentially save up to 18% on your flight if you consider stops on a St. Louis to Montreal flight.

When to book flights from St. Louis to Montreal

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Montreal according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Montreal (STL to YMQ) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Montreal

Best Price Found

$299

Fastest flight time

2h 32m

Direct flights

Every day

Airports in Montreal

2 airports
The best one-way flight to Montreal from St. Louis in the past 72 hours is $299. The best round-trip flight deal from St. Louis to Montreal found on momondo in the last 72 hours is $801.
The fastest flight from St. Louis to Montreal takes 2h 32m
Direct flights go from St. Louis to Montreal every day.
There are 2 airports in Montreal. From St. Louis there are direct flights to Montreal Pierre Elliott Trudeau Intl (YUL).
Search flight deals

  • How far is Lambert-St Louis to Montreal by plane?

    The distance between Lambert-St Louis and Montreal is about 973.0 mi. A reasonable flight in good conditions will take 2h 32m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Montreal?

    Prices for flights from Lambert-St Louis Airport to Montreal are updated daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Montreal?

  • How old do you have to be to fly from Lambert-St Louis Airport to Montreal?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Montreal.

  • What documentation or ID do you need to fly to Montreal?

    The required travel and health documents for your Montreal trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Montreal. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from St. Louis to Montreal?

  • What is the most popular airline from St. Louis to Montreal?

Best airlines flying from St. Louis to Montreal

Compare and see reviews for airlines that fly from St. Louis to Montreal with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $212Free CancellationRating
7.9
8,240 reviews
Search Delta flights
United AirlinesPriceFrom $246Free CancellationRating
7.4
9,341 reviews
Search United Airlines flights
Air CanadaPriceFrom $318Free CancellationRating
7.1
10,738 reviews
Search Air Canada flights
American AirlinesPriceFrom $348Free CancellationRating
7.2
11,338 reviews
Search American Airlines flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from St. Louis to Montreal for you.

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

All flight searches from St. Louis to Montreal on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from St. Louis to Montreal?

Once all potential St. Louis to Montreal 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 St. Louis to Montreal right now. Can momondo alert me if prices change?

Yes. momondo can track prices for St. Louis to Montreal flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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Find better results for your trip to Canada

Fly into one of these airports located in Montreal

Airports listed have a maximum distance of 9.4 mi from Montreal
Montreal St Hubert Airport
Montreal Pierre Elliott Trudeau Intl Airport