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Cheap flights from St. Louis to Montreal from $138

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 12/7. 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

Enter your travel dates to find the best prices.
American Airlines Logo
6:00 am - 3:08 pmSTL-YUL
8h 08m1 stop
American Airlines Logo
3:52 pm - 10:21 amYUL-STL
19h 29m1 stop
$298American Airlines
Find Deal
Tue, Jan 6 - Mon, Jan 12
American Airlines Logo
6:44 pm - 3:08 pmSTL-YUL
19h 24m1 stop
American Airlines Logo
3:52 pm - 10:21 amYUL-STL
19h 29m1 stop
$315American Airlines
Find Deal
Sun, Jan 18 - Fri, Jan 30
Multiple Airlines Logo
5:11 pm - 12:30 amSTL-YUL
30h 19m1 stop
Multiple Airlines Logo
8:00 am - 10:37 pmYUL-STL
39h 37m2 stops
$353Multiple Airlines
Find Deal
Tue, Jan 6 - Mon, Jan 12
Multiple Airlines Logo
5:11 pm - 3:10 pmSTL-YUL
20h 59m2 stops
Multiple Airlines Logo
4:35 pm - 7:50 amYUL-STL
16h 15m1 stop
$403Multiple Airlines
Find Deal
Wed, Jan 28 - Sun, Feb 1
United Airlines Logo
6:30 am - 4:01 pmSTL-YUL
8h 31m1 stop
United Airlines Logo
6:25 pm - 12:29 pmYUL-STL
19h 04m1 stop
$433United Airlines
Find Deal
Wed, Jan 28 - Wed, Jan 28
United Airlines Logo
6:30 am - 7:11 pmSTL-YUL
11h 41m2 stops
United Airlines Logo
7:00 am - 5:43 pmYUL-STL
11h 43m2 stops
$511United Airlines
Find Deal
Tue, Jan 20 - Fri, Jan 23
Delta Logo
6:00 am - 6:37 pmSTL-YUL
11h 37m2 stops
Delta Logo
9:34 am - 8:39 pmYUL-STL
12h 05m2 stops
$643Delta
Find Deal
Sun, Jan 18 - Fri, Jan 30
Delta Logo
9:50 am - 6:54 pmSTL-YUL
8h 04m1 stop
Delta Logo
9:34 am - 8:45 pmYUL-STL
12h 11m2 stops
$666Delta
Find Deal
Mon, Dec 15 - Tue, Jan 6
Air Canada Logo
4:05 pm - 10:22 pmSTL-YUL
5h 17m1 stop
Air Canada Logo
9:10 am - 3:29 pmYUL-STL
7h 19m1 stop
$697Air Canada
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Mon, Dec 15 - Sat, Jan 3
Air Canada Logo
4:05 pm - 9:52 pmSTL-YUL
4h 47m1 stop
Air Canada Logo
10:10 am - 3:29 pmYUL-STL
6h 19m1 stop
$699Air Canada
Find Deal
Mon, Dec 15 - Sat, Jan 3

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
Jan 6
STL6:00 amLambert-St Louis
8h 08m
1 stop
YUL3:08 pmMontreal Pierre Elliott Trudeau Intl
Jan 12
YUL3:52 pmMontreal Pierre Elliott Trudeau Intl
19h 29m
1 stop
STL10:21 amLambert-St Louis
$298
Find similar
American Airlines
Jan 18
STL6:44 pmLambert-St Louis
19h 24m
1 stop
YUL3:08 pmMontreal Pierre Elliott Trudeau Intl
Jan 30
YUL3:52 pmMontreal Pierre Elliott Trudeau Intl
19h 29m
1 stop
STL10:21 amLambert-St Louis
$315
Find similar
American Airlines
Jan 28
STL6:44 pmLambert-St Louis
19h 24m
1 stop
YUL3:08 pmMontreal Pierre Elliott Trudeau Intl
Jan 31
YUL7:30 amMontreal Pierre Elliott Trudeau Intl
11h 43m
2 stops
STL6:13 pmLambert-St Louis
$335
Find similar

United Airlines flights from St. Louis to Montreal

Our best United Airlines deals on St. Louis to Montreal flight tickets
United Airlines
Jan 28
STL6:30 amLambert-St Louis
8h 31m
1 stop
YUL4:01 pmMontreal Pierre Elliott Trudeau Intl
Jan 28
YUL6:25 pmMontreal Pierre Elliott Trudeau Intl
19h 04m
1 stop
STL12:29 pmLambert-St Louis
$433
Find similar
United Airlines
Jan 20
STL6:30 amLambert-St Louis
11h 41m
2 stops
YUL7:11 pmMontreal Pierre Elliott Trudeau Intl
Jan 23
YUL7:00 amMontreal Pierre Elliott Trudeau Intl
11h 43m
2 stops
STL5:43 pmLambert-St Louis
$511
Find similar
United Airlines
Jan 28
STL6:30 amLambert-St Louis
8h 31m
1 stop
YUL4:01 pmMontreal Pierre Elliott Trudeau Intl
Jan 28
YUL8:00 pmMontreal Pierre Elliott Trudeau Intl
17h 29m
2 stops
STL12:29 pmLambert-St Louis
$523
Find similar

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 November 12, 2025.
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

Tue 1/6

6:00 am-3:08 pm

1 stop8h 08m

Montreal Pierre Elliott Trudeau Intl

Mon 1/12

3:52 pm-10:21 am

1 stop19h 29m

$298

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 1/18

6:44 pm-3:08 pm

1 stop19h 24m

Montreal Pierre Elliott Trudeau Intl

Fri 1/30

3:52 pm-10:21 am

1 stop19h 29m

$315

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 1/6

5:11 pm-12:30 am

1 stop30h 19m

Montreal Pierre Elliott Trudeau Intl

Mon 1/12

8:00 am-10:37 pm

2 stops39h 37m

$353

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 1/28

5:11 pm-3:10 pm

2 stops20h 59m

Montreal Pierre Elliott Trudeau Intl

Sun 2/1

4:35 pm-7:50 am

1 stop16h 15m

$403

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 1/28

6:30 am-4:01 pm

1 stop8h 31m

Montreal Pierre Elliott Trudeau Intl

Wed 1/28

6:25 pm-12:29 pm

1 stop19h 04m

$433

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 1/20

6:30 am-7:11 pm

2 stops11h 41m

Montreal Pierre Elliott Trudeau Intl

Fri 1/23

7:00 am-5:43 pm

2 stops11h 43m

$511

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 1/18

6:00 am-6:37 pm

2 stops11h 37m

Montreal Pierre Elliott Trudeau Intl

Fri 1/30

9:34 am-8:39 pm

2 stops12h 05m

$643

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 12/15

9:50 am-6:54 pm

1 stop8h 04m

Montreal Pierre Elliott Trudeau Intl

Tue 1/6

9:34 am-8:45 pm

2 stops12h 11m

$666

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 12/15

4:05 pm-10:22 pm

1 stop5h 17m

Montreal Pierre Elliott Trudeau Intl

Sat 1/3

9:10 am-3:29 pm

1 stop7h 19m

$697

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 12/15

4:05 pm-9:52 pm

1 stop4h 47m

Montreal Pierre Elliott Trudeau Intl

Sat 1/3

10:10 am-3:29 pm

1 stop6h 19m

$699

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 $1,034. Flights from St. Louis to Montreal on a Friday will generally be more expensive and average around $1,218. 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 evening. Flights from St. Louis to Montreal during this time can be as low as $266. At noon is when there is more demand to fly to Montreal, so prices are often more expensive at around $1,098 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?

No. A direct flight is the cheapest option for a flight between St. Louis to Montreal.

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

$578

Fastest flight time

2h 35m

Direct flights

Fri

Airports in Montreal

1 airport
The best one-way flight to Montreal from St. Louis in the past 72 hours is $578. The best round-trip flight deal from St. Louis to Montreal found on momondo in the last 72 hours is $847.
The fastest flight from St. Louis to Montreal takes 2h 35m
Direct flights go from St. Louis to Montreal on Friday. There are no airlines offering direct flights.
There is 1 airport near Montreal: 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 4h 47m.

  • 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
United AirlinesPriceFrom $246Free CancellationRating
7.4
9,015 reviews
Search United Airlines flights
DeltaPriceFrom $255Free CancellationRating
7.9
8,008 reviews
Search Delta flights
Air CanadaPriceFrom $285Free CancellationRating
7.1
10,443 reviews
Search Air Canada flights
American AirlinesPriceFrom $348Free CancellationRating
7.2
11,050 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