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Cheap flights from St. Louis to Montreal from $198

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 3/15. 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
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
6:36 pm - 3:04 pm
STL
-
YUL
19h 28m1 stop
American Airlines Logo
3:45 pm - 11:48 pm
YUL
-
STL
9h 03m1 stop
$353American Airlines
Wed, Feb 18 - Mon, Feb 23
American Airlines Logo
10:37 am - 10:56 pm
STL
-
YUL
11h 19m2 stops
American Airlines Logo
3:45 pm - 8:41 am
YUL
-
STL
17h 56m1 stop
$363American Airlines
Wed, Feb 18 - Mon, Feb 23
Multiple Airlines Logo
12:12 pm - 12:30 am
STL
-
YUL
11h 18m1 stop
Multiple Airlines Logo
7:30 pm - 9:06 pm
YUL
-
STL
50h 36m2 stops
$380Multiple Airlines
Sat, Jan 24 - Tue, Jan 27
Multiple Airlines Logo
3:49 pm - 12:30 am
STL
-
YUL
7h 41m1 stop
Multiple Airlines Logo
7:30 pm - 6:51 am
YUL
-
STL
36h 21m2 stops
$406Multiple Airlines
Mon, Feb 23 - Mon, Mar 2
American Airlines Logo
6:00 am - 3:04 pm
STL
-
YUL
8h 04m1 stop
American Airlines Logo
3:45 pm - 9:33 am
YUL
-
STL
18h 48m1 stop
$410American Airlines
Mon, Feb 23 - Mon, Mar 2
Multiple Airlines Logo
12:12 pm - 12:30 am
STL
-
YUL
11h 18m1 stop
Multiple Airlines Logo
6:45 am - 11:33 pm
YUL
-
STL
41h 48m2 stops
$450Multiple Airlines
Sat, Jan 24 - Tue, Jan 27
United Airlines Logo
4:49 pm - 2:00 pm
STL
-
YUL
20h 11m1 stop
United Airlines Logo
4:45 pm - 12:29 pm
YUL
-
STL
20h 44m1 stop
$461United Airlines
Sat, Jan 31 - Wed, Feb 4
United Airlines Logo
4:49 pm - 2:00 pm
STL
-
YUL
20h 11m1 stop
United Airlines Logo
7:00 pm - 12:29 pm
YUL
-
STL
18h 29m2 stops
$471United Airlines
Sat, Jan 31 - Wed, Feb 4
American Airlines Logo
6:00 am - 3:04 pm
STL
-
YUL
8h 04m1 stop
American Airlines Logo
3:45 pm - 11:48 pm
YUL
-
STL
9h 03m1 stop
$479American Airlines
Thu, Feb 19 - Mon, Feb 23
Multiple Airlines Logo
9:02 pm - 12:35 am
STL
-
YUL
26h 33m2 stops
Multiple Airlines Logo
4:35 pm - 11:59 pm
YUL
-
STL
8h 24m1 stop
$486Multiple Airlines
Fri, Feb 13 - Sun, Feb 15

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
Feb 18
STL6:36 pmLambert-St Louis
19h 28m
1 stop
YUL3:04 pmMontreal Pierre Elliott Trudeau Intl
Feb 23
YUL3:45 pmMontreal Pierre Elliott Trudeau Intl
9h 03m
1 stop
STL11:48 pmLambert-St Louis
$353
American Airlines
Feb 18
STL10:37 amLambert-St Louis
11h 19m
2 stops
YUL10:56 pmMontreal Pierre Elliott Trudeau Intl
Feb 23
YUL3:45 pmMontreal Pierre Elliott Trudeau Intl
17h 56m
1 stop
STL8:41 amLambert-St Louis
$363
American Airlines
Feb 23
STL6:00 amLambert-St Louis
8h 04m
1 stop
YUL3:04 pmMontreal Pierre Elliott Trudeau Intl
Mar 2
YUL3:45 pmMontreal Pierre Elliott Trudeau Intl
18h 48m
1 stop
STL9:33 amLambert-St Louis
$410

United Airlines flights from St. Louis to Montreal

Our best United Airlines deals on St. Louis to Montreal flight tickets
United Airlines
Jan 31
STL4:49 pmLambert-St Louis
20h 11m
1 stop
YUL2:00 pmMontreal Pierre Elliott Trudeau Intl
Feb 4
YUL4:45 pmMontreal Pierre Elliott Trudeau Intl
20h 44m
1 stop
STL12:29 pmLambert-St Louis
$461
United Airlines
Jan 31
STL4:49 pmLambert-St Louis
20h 11m
1 stop
YUL2:00 pmMontreal Pierre Elliott Trudeau Intl
Feb 4
YUL7:00 pmMontreal Pierre Elliott Trudeau Intl
18h 29m
2 stops
STL12:29 pmLambert-St Louis
$471
United Airlines
Jan 31
STL4:49 pmLambert-St Louis
20h 11m
1 stop
YUL2:00 pmMontreal Pierre Elliott Trudeau Intl
Feb 4
YUL9:25 amMontreal Pierre Elliott Trudeau Intl
14h 33m
1 stop
STL10:58 pmLambert-St Louis
$508

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 11, 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

Wed 2/18

6:36 pm-3:04 pm

1 stop19h 28m

Montreal Pierre Elliott Trudeau Intl

Mon 2/23

3:45 pm-11:48 pm

1 stop9h 03m

$353

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 2/18

10:37 am-10:56 pm

2 stops11h 19m

Montreal Pierre Elliott Trudeau Intl

Mon 2/23

3:45 pm-8:41 am

1 stop17h 56m

$363

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/24

12:12 pm-12:30 am

1 stop11h 18m

Montreal Pierre Elliott Trudeau Intl

Tue 1/27

7:30 pm-9:06 pm

2 stops50h 36m

$380

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 2/23

3:49 pm-12:30 am

1 stop7h 41m

Montreal Pierre Elliott Trudeau Intl

Mon 3/2

7:30 pm-6:51 am

2 stops36h 21m

$406

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 2/23

6:00 am-3:04 pm

1 stop8h 04m

Montreal Pierre Elliott Trudeau Intl

Mon 3/2

3:45 pm-9:33 am

1 stop18h 48m

$410

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/24

12:12 pm-12:30 am

1 stop11h 18m

Montreal Pierre Elliott Trudeau Intl

Tue 1/27

6:45 am-11:33 pm

2 stops41h 48m

$450

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/31

4:49 pm-2:00 pm

1 stop20h 11m

Montreal Pierre Elliott Trudeau Intl

Wed 2/4

4:45 pm-12:29 pm

1 stop20h 44m

$461

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/31

4:49 pm-2:00 pm

1 stop20h 11m

Montreal Pierre Elliott Trudeau Intl

Wed 2/4

7:00 pm-12:29 pm

2 stops18h 29m

$471

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 2/19

6:00 am-3:04 pm

1 stop8h 04m

Montreal Pierre Elliott Trudeau Intl

Mon 2/23

3:45 pm-11:48 pm

1 stop9h 03m

$479

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 2/13

9:02 pm-12:35 am

2 stops26h 33m

Montreal Pierre Elliott Trudeau Intl

Sun 2/15

4:35 pm-11:59 pm

1 stop8h 24m

$486

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 18 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 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

$366

Fastest flight time

2h 32m

Direct flights

Mon, Tue, Wed, Thu, Fri and Sat

Airports in Montreal

2 airports
The best one-way flight to Montreal from St. Louis in the past 72 hours is $366. The best round-trip flight deal from St. Louis to Montreal found on momondo in the last 72 hours is $688.
The fastest flight from St. Louis to Montreal takes 2h 32m
Direct flights go from St. Louis to Montreal on Monday, Tuesday, Wednesday, Thursday, Friday 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
United AirlinesPriceFrom $246Free CancellationRating
7.4
9,145 reviews
Search United Airlines flights
DeltaPriceFrom $255Free CancellationRating
7.9
8,036 reviews
Search Delta flights
Air CanadaPriceFrom $318Free CancellationRating
7.1
10,608 reviews
Search Air Canada flights
American AirlinesPriceFrom $348Free CancellationRating
7.2
11,104 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