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Cheap flights from St. Louis to Montreal from $174

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 3/9. 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
6:31 pm - 3:04 pm
STL
-
YUL
19h 33m
1 stop
American Airlines Logo
3:45 pm - 10:13 am
YUL
-
STL
19h 28m
1 stop
$359American Airlines
Tue, Feb 17 - Fri, Feb 20
Multiple Airlines Logo
3:49 pm - 12:30 am
STL
-
YUL
7h 41m
1 stop
Multiple Airlines Logo
5:25 pm - 11:19 pm
YUL
-
STL
30h 54m
2 stops
$409Multiple Airlines
Mon, Mar 2 - Mon, Mar 9
American Airlines Logo
6:36 pm - 3:04 pm
STL
-
YUL
19h 28m
1 stop
American Airlines Logo
3:45 pm - 8:51 am
YUL
-
STL
18h 06m
1 stop
$516American Airlines
Mon, Mar 2 - Mon, Mar 9
American Airlines Logo
10:37 am - 10:56 pm
STL
-
YUL
11h 19m
2 stops
American Airlines Logo
3:45 pm - 10:13 am
YUL
-
STL
19h 28m
1 stop
$531American Airlines
Tue, Feb 17 - Fri, Feb 20
Multiple Airlines Logo
7:35 pm - 12:30 am
STL
-
YUL
27h 55m
1 stop
Multiple Airlines Logo
8:00 am - 7:02 am
YUL
-
STL
24h 02m
2 stops
$541Multiple Airlines
Fri, Mar 13 - Wed, Mar 18
Multiple Airlines Logo
3:49 pm - 12:30 am
STL
-
YUL
7h 41m
1 stop
Multiple Airlines Logo
6:10 pm - 8:02 pm
YUL
-
STL
50h 52m
2 stops
$547Multiple Airlines
Sat, Feb 14 - Sat, Feb 21
Multiple Airlines Logo
8:53 pm - 12:30 am
STL
-
YUL
26h 37m
1 stop
Multiple Airlines Logo
8:00 am - 11:19 pm
YUL
-
STL
16h 19m
2 stops
$553Multiple Airlines
Sat, Mar 21 - Tue, Mar 24
Multiple Airlines Logo
12:12 pm - 12:30 am
STL
-
YUL
11h 18m
1 stop
Multiple Airlines Logo
6:45 am - 12:27 am
YUL
-
STL
42h 42m
2 stops
$566Multiple Airlines
Sat, Jan 31 - Thu, Feb 26
United Airlines Logo
9:55 am - 9:42 pm
STL
-
YUL
10h 47m
2 stops
United Airlines Logo
1:10 pm - 10:36 am
YUL
-
STL
22h 26m
1 stop
$576United Airlines
Tue, Feb 17 - Fri, Feb 20
United Airlines Logo
8:17 am - 7:48 pm
STL
-
YUL
10h 31m
2 stops
United Airlines Logo
7:00 am - 7:14 pm
YUL
-
STL
13h 14m
2 stops
$581United Airlines
Sat, Feb 14 - Sat, Feb 21

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
Feb 17
STL6:31 pmLambert-St Louis
19h 33m
1 stop
YUL3:04 pmMontreal Pierre Elliott Trudeau Intl
Feb 20
YUL3:45 pmMontreal Pierre Elliott Trudeau Intl
19h 28m
1 stop
STL10:13 amLambert-St Louis
$359
American Airlines
Mar 2
STL6:36 pmLambert-St Louis
19h 28m
1 stop
YUL3:04 pmMontreal Pierre Elliott Trudeau Intl
Mar 9
YUL3:45 pmMontreal Pierre Elliott Trudeau Intl
18h 06m
1 stop
STL8:51 amLambert-St Louis
$516
American Airlines
Feb 17
STL10:37 amLambert-St Louis
11h 19m
2 stops
YUL10:56 pmMontreal Pierre Elliott Trudeau Intl
Feb 20
YUL3:45 pmMontreal Pierre Elliott Trudeau Intl
19h 28m
1 stop
STL10:13 amLambert-St Louis
$531

Delta flights from St. Louis to Montreal

Our best Delta deals on St. Louis to Montreal flight tickets
Delta
Feb 18
STL6:35 amLambert-St Louis
11h 00m
2 stops
YUL6:35 pmMontreal Pierre Elliott Trudeau Intl
Feb 23
YUL9:29 amMontreal Pierre Elliott Trudeau Intl
12h 14m
2 stops
STL8:43 pmLambert-St Louis
$590
Delta
Feb 17
STL6:00 amLambert-St Louis
11h 35m
2 stops
YUL6:35 pmMontreal Pierre Elliott Trudeau Intl
Feb 20
YUL9:29 amMontreal Pierre Elliott Trudeau Intl
12h 12m
2 stops
STL8:41 pmLambert-St Louis
$614
Delta
Feb 17
STL7:10 amLambert-St Louis
10h 25m
2 stops
YUL6:35 pmMontreal Pierre Elliott Trudeau Intl
Feb 20
YUL9:29 amMontreal Pierre Elliott Trudeau Intl
12h 12m
2 stops
STL8:41 pmLambert-St Louis
$629

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 January 18, 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

Tue 2/17

6:31 pm-3:04 pm

1 stop19h 33m

Montreal Pierre Elliott Trudeau Intl

Fri 2/20

3:45 pm-10:13 am

1 stop19h 28m

$359

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 3/2

3:49 pm-12:30 am

1 stop7h 41m

Montreal Pierre Elliott Trudeau Intl

Mon 3/9

5:25 pm-11:19 pm

2 stops30h 54m

$409

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 3/2

6:36 pm-3:04 pm

1 stop19h 28m

Montreal Pierre Elliott Trudeau Intl

Mon 3/9

3:45 pm-8:51 am

1 stop18h 06m

$516

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/17

10:37 am-10:56 pm

2 stops11h 19m

Montreal Pierre Elliott Trudeau Intl

Fri 2/20

3:45 pm-10:13 am

1 stop19h 28m

$531

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 3/13

7:35 pm-12:30 am

1 stop27h 55m

Montreal Pierre Elliott Trudeau Intl

Wed 3/18

8:00 am-7:02 am

2 stops24h 02m

$541

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 2/14

3:49 pm-12:30 am

1 stop7h 41m

Montreal Pierre Elliott Trudeau Intl

Sat 2/21

6:10 pm-8:02 pm

2 stops50h 52m

$547

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 3/21

8:53 pm-12:30 am

1 stop26h 37m

Montreal Pierre Elliott Trudeau Intl

Tue 3/24

8:00 am-11:19 pm

2 stops16h 19m

$553

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/31

12:12 pm-12:30 am

1 stop11h 18m

Montreal Pierre Elliott Trudeau Intl

Thu 2/26

6:45 am-12:27 am

2 stops42h 42m

$566

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/17

9:55 am-9:42 pm

2 stops10h 47m

Montreal Pierre Elliott Trudeau Intl

Fri 2/20

1:10 pm-10:36 am

1 stop22h 26m

$576

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 2/14

8:17 am-7:48 pm

2 stops10h 31m

Montreal Pierre Elliott Trudeau Intl

Sat 2/21

7:00 am-7:14 pm

2 stops13h 14m

$581

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 Tuesday when prices can be found for as low as $1,009. Flights from St. Louis to Montreal on a Friday will generally be more expensive and average around $1,170. 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 $906. At noon is when there is more demand to fly to Montreal, so prices are often more expensive at around $1,080 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

$442

Fastest flight time

2h 32m

Direct flights

Mon, Thu and Sat

Airports in Montreal

2 airports
The best one-way flight to Montreal from St. Louis in the past 72 hours is $442. The best round-trip flight deal from St. Louis to Montreal found on momondo in the last 72 hours is $792.
The fastest flight from St. Louis to Montreal takes 2h 32m
Direct flights go from St. Louis to Montreal on Monday, Thursday and Saturday. There are no airlines offering direct flights.
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
8,073 reviews
Search Delta flights
United AirlinesPriceFrom $246Free CancellationRating
7.4
9,174 reviews
Search United Airlines flights
Air CanadaPriceFrom $285Free CancellationRating
7.1
10,632 reviews
Search Air Canada flights
American AirlinesPriceFrom $348Free CancellationRating
7.2
11,155 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