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Cheap flights from St. Louis to Montreal from $205

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 4/24. 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
8:03 pm - 11:44 am
STL
-
YUL
14h 41m
1 stop
American Airlines Logo
12:30 pm - 11:56 pm
YUL
-
STL
12h 26m
1 stop
$411American Airlines
Tue, May 5 - Tue, May 12
Multiple Airlines Logo
8:23 pm - 2:08 pm
STL
-
YUL
40h 45m
2 stops
Multiple Airlines Logo
4:35 pm - 11:19 pm
YUL
-
STL
7h 44m
1 stop
$419Multiple Airlines
Wed, Apr 29 - Sun, May 3
American Airlines Logo
5:21 pm - 11:44 am
STL
-
YUL
17h 23m
1 stop
American Airlines Logo
1:03 pm - 11:56 pm
YUL
-
STL
11h 53m
2 stops
$421American Airlines
Tue, May 5 - Tue, May 12
American Airlines Logo
4:30 pm - 11:44 am
STL
-
YUL
18h 14m
1 stop
American Airlines Logo
12:30 pm - 11:56 pm
YUL
-
STL
12h 26m
1 stop
$432American Airlines
Tue, May 5 - Tue, May 12
American Airlines Logo
4:30 pm - 11:44 am
STL
-
YUL
18h 14m
1 stop
American Airlines Logo
1:03 pm - 11:56 pm
YUL
-
STL
11h 53m
2 stops
$442American Airlines
Tue, May 5 - Tue, May 12
Multiple Airlines Logo
8:23 pm - 2:08 pm
STL
-
YUL
40h 45m
2 stops
Multiple Airlines Logo
4:35 pm - 11:19 pm
YUL
-
STL
7h 44m
1 stop
$454Multiple Airlines
Wed, Apr 29 - Sun, May 3
Multiple Airlines Logo
4:59 pm - 12:30 am
STL
-
YUL
30h 31m
1 stop
Multiple Airlines Logo
8:00 am - 6:50 am
YUL
-
STL
47h 50m
2 stops
$455Multiple Airlines
Mon, Apr 20 - Mon, Apr 27
American Airlines Logo
4:30 pm - 11:44 am
STL
-
YUL
18h 14m
1 stop
American Airlines Logo
1:03 pm - 11:46 pm
YUL
-
STL
11h 43m
2 stops
$457American Airlines
Wed, Apr 29 - Sat, May 2
American Airlines Logo
8:54 am - 9:37 pm
STL
-
YUL
11h 43m
2 stops
American Airlines Logo
1:03 pm - 11:46 pm
YUL
-
STL
11h 43m
2 stops
$462American Airlines
Wed, Apr 29 - Sat, May 2
Multiple Airlines Logo
8:23 pm - 2:08 pm
STL
-
YUL
40h 45m
2 stops
Multiple Airlines Logo
6:51 pm - 11:59 pm
YUL
-
STL
6h 08m
1 stop
$484Multiple Airlines
Mon, May 4 - Mon, May 11

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
May 5
STL8:03 pmLambert-St Louis
14h 41m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
May 12
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
12h 26m
1 stop
STL11:56 pmLambert-St Louis
$411
American Airlines
May 5
STL5:21 pmLambert-St Louis
17h 23m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
May 12
YUL1:03 pmMontreal Pierre Elliott Trudeau Intl
11h 53m
2 stops
STL11:56 pmLambert-St Louis
$421
American Airlines
May 5
STL4:30 pmLambert-St Louis
18h 14m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
May 12
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
12h 26m
1 stop
STL11:56 pmLambert-St Louis
$432

United Airlines flights from St. Louis to Montreal

Our best United Airlines deals on St. Louis to Montreal flight tickets
United Airlines
Apr 22
STL6:15 amLambert-St Louis
5h 54m
1 stop
YUL1:09 pmMontreal Pierre Elliott Trudeau Intl
Apr 22
YUL5:00 pmMontreal Pierre Elliott Trudeau Intl
5h 13m
1 stop
STL9:13 pmLambert-St Louis
$589
United Airlines
Apr 28
STL7:45 amLambert-St Louis
25h 55m
1 stop
YUL10:40 amMontreal Pierre Elliott Trudeau Intl
Apr 29
YUL6:30 pmMontreal Pierre Elliott Trudeau Intl
17h 18m
1 stop
STL10:48 amLambert-St Louis
$593
United Airlines
Apr 20
STL6:15 amLambert-St Louis
5h 54m
1 stop
YUL1:09 pmMontreal Pierre Elliott Trudeau Intl
Apr 23
YUL11:23 amMontreal Pierre Elliott Trudeau Intl
6h 20m
1 stop
STL4:43 pmLambert-St Louis
$619

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 April 7, 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

Cheapest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 5/5

8:03 pm-11:44 am

1 stop14h 41m

Montreal Pierre Elliott Trudeau Intl

Tue 5/12

12:30 pm-11:56 pm

1 stop12h 26m

$411

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 4/29

8:23 pm-2:08 pm

2 stops40h 45m

Montreal Pierre Elliott Trudeau Intl

Sun 5/3

4:35 pm-11:19 pm

1 stop7h 44m

$419

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 5/5

5:21 pm-11:44 am

1 stop17h 23m

Montreal Pierre Elliott Trudeau Intl

Tue 5/12

1:03 pm-11:56 pm

2 stops11h 53m

$421

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 5/5

4:30 pm-11:44 am

1 stop18h 14m

Montreal Pierre Elliott Trudeau Intl

Tue 5/12

12:30 pm-11:56 pm

1 stop12h 26m

$432

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 5/5

4:30 pm-11:44 am

1 stop18h 14m

Montreal Pierre Elliott Trudeau Intl

Tue 5/12

1:03 pm-11:56 pm

2 stops11h 53m

$442

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 4/29

8:23 pm-2:08 pm

2 stops40h 45m

Montreal Pierre Elliott Trudeau Intl

Sun 5/3

4:35 pm-11:19 pm

1 stop7h 44m

$454

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 4/20

4:59 pm-12:30 am

1 stop30h 31m

Montreal Pierre Elliott Trudeau Intl

Mon 4/27

8:00 am-6:50 am

2 stops47h 50m

$455

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 4/29

4:30 pm-11:44 am

1 stop18h 14m

Montreal Pierre Elliott Trudeau Intl

Sat 5/2

1:03 pm-11:46 pm

2 stops11h 43m

$457
Quickest round-trip

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 4/29

8:54 am-9:37 pm

2 stops11h 43m

Montreal Pierre Elliott Trudeau Intl

Sat 5/2

1:03 pm-11:46 pm

2 stops11h 43m

$462

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 5/4

8:23 pm-2:08 pm

2 stops40h 45m

Montreal Pierre Elliott Trudeau Intl

Mon 5/11

6:51 pm-11:59 pm

1 stop6h 08m

$484

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

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 Wednesday when prices can be found for as low as $935. Flights from St. Louis to Montreal on a Friday will generally be more expensive and average around $1,174. 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 $998. At noon is when there is more demand to fly to Montreal, so prices are often more expensive at around $1,022 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 5% 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

$337

Fastest flight time

2h 31m

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 $337. The best round-trip flight deal from St. Louis to Montreal found on momondo in the last 72 hours is $993.
The fastest flight from St. Louis to Montreal takes 2h 31m
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

Frequently asked questions about flying from St. Louis to Montreal

  • 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 31m.

  • 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
8,387 reviews
Search Delta flights
United AirlinesPriceFrom $239Free CancellationRating
7.4
9,550 reviews
Search United Airlines flights
Air CanadaPriceFrom $318Free CancellationRating
7.1
10,901 reviews
Search Air Canada flights
American AirlinesPriceFrom $348Free CancellationRating
7.1
11,552 reviews
Search American Airlines flights

  • United Airlines Flights From St. Louis to Montreal

    Across 7 United Airlines flights from St. Louis to Montreal this week, the average price was $765, with the best United Airlines deals starting from $239 round-trip. 9,550 users have rated United Airlines on momondo, with an average score of 7.4/10.

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