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Cheap flights from St. Louis to Montreal from $162

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 1/28. 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
6:44 pm - 3:08 pm
STL
-
YUL
19h 24m1 stop
American Airlines Logo
3:50 pm - 10:20 am
YUL
-
STL
19h 30m1 stop
$402American Airlines
Mon, Jan 26 - Mon, Feb 2
American Airlines Logo
6:36 pm - 3:04 pm
STL
-
YUL
19h 28m1 stop
American Airlines Logo
3:45 pm - 8:41 am
YUL
-
STL
17h 56m1 stop
$420American Airlines
Thu, Feb 26 - Mon, Mar 2
Multiple Airlines Logo
10:06 am - 12:30 am
STL
-
YUL
13h 24m1 stop
Multiple Airlines Logo
8:00 am - 6:51 am
YUL
-
STL
23h 51m2 stops
$422Multiple Airlines
Sun, Jan 18 - Sun, Jan 25
Multiple Airlines Logo
8:32 pm - 7:05 am
STL
-
YUL
33h 33m2 stops
Multiple Airlines Logo
4:35 pm - 11:33 pm
YUL
-
STL
7h 58m1 stop
$442Multiple Airlines
Sat, Jan 17 - Sun, Jan 25
Multiple Airlines Logo
9:03 pm - 7:05 am
STL
-
YUL
33h 02m2 stops
Multiple Airlines Logo
4:35 pm - 11:33 pm
YUL
-
STL
7h 58m1 stop
$443Multiple Airlines
Mon, Jan 19 - Sun, Jan 25
Multiple Airlines Logo
10:06 am - 12:30 am
STL
-
YUL
13h 24m1 stop
Multiple Airlines Logo
8:00 am - 6:51 am
YUL
-
STL
23h 51m2 stops
$449Multiple Airlines
Sun, Jan 18 - Fri, Jan 23
American Airlines Logo
6:46 pm - 3:08 pm
STL
-
YUL
19h 22m1 stop
American Airlines Logo
3:50 pm - 10:20 am
YUL
-
STL
19h 30m1 stop
$459American Airlines
Tue, Jan 20 - Fri, Jan 23
Multiple Airlines Logo
10:06 am - 12:30 am
STL
-
YUL
13h 24m1 stop
Multiple Airlines Logo
4:35 pm - 9:21 am
YUL
-
STL
17h 46m1 stop
$466Multiple Airlines
Sun, Jan 18 - Sun, Jan 25
American Airlines Logo
6:00 am - 10:44 pm
STL
-
YUL
15h 44m2 stops
American Airlines Logo
3:50 pm - 10:20 am
YUL
-
STL
19h 30m1 stop
$468American Airlines
Tue, Jan 20 - Fri, Jan 23
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
$471American Airlines
Thu, Feb 19 - Mon, Feb 23

Delta flights from St. Louis to Montreal

Our best Delta deals on St. Louis to Montreal flight tickets
Delta
Jan 20
STL6:00 amLambert-St Louis
11h 37m
2 stops
YUL6:37 pmMontreal Pierre Elliott Trudeau Intl
Jan 23
YUL9:34 amMontreal Pierre Elliott Trudeau Intl
12h 03m
2 stops
STL8:37 pmLambert-St Louis
$613
Find similar
Delta
Feb 19
STL7:10 amLambert-St Louis
10h 25m
2 stops
YUL6:35 pmMontreal Pierre Elliott Trudeau Intl
Feb 23
YUL9:29 amMontreal Pierre Elliott Trudeau Intl
12h 12m
2 stops
STL8:41 pmLambert-St Louis
$617
Find similar
Delta
Jan 6
STL9:45 amLambert-St Louis
7h 52m
1 stop
YUL6:37 pmMontreal Pierre Elliott Trudeau Intl
Jan 13
YUL9:34 amMontreal Pierre Elliott Trudeau Intl
12h 09m
2 stops
STL8:43 pmLambert-St Louis
$701
Find similar

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
Jan 26
STL6:44 pmLambert-St Louis
19h 24m
1 stop
YUL3:08 pmMontreal Pierre Elliott Trudeau Intl
Feb 2
YUL3:50 pmMontreal Pierre Elliott Trudeau Intl
19h 30m
1 stop
STL10:20 amLambert-St Louis
$402
Find similar
American Airlines
Feb 26
STL6:36 pmLambert-St Louis
19h 28m
1 stop
YUL3:04 pmMontreal Pierre Elliott Trudeau Intl
Mar 2
YUL3:45 pmMontreal Pierre Elliott Trudeau Intl
17h 56m
1 stop
STL8:41 amLambert-St Louis
$420
Find similar
American Airlines
Jan 20
STL6:46 pmLambert-St Louis
19h 22m
1 stop
YUL3:08 pmMontreal Pierre Elliott Trudeau Intl
Jan 23
YUL3:50 pmMontreal Pierre Elliott Trudeau Intl
19h 30m
1 stop
STL10:20 amLambert-St Louis
$459
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 December 31, 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

Mon 1/26

6:44 pm-3:08 pm

1 stop19h 24m

Montreal Pierre Elliott Trudeau Intl

Mon 2/2

3:50 pm-10:20 am

1 stop19h 30m

$402

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Thu 2/26

6:36 pm-3:04 pm

1 stop19h 28m

Montreal Pierre Elliott Trudeau Intl

Mon 3/2

3:45 pm-8:41 am

1 stop17h 56m

$420

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 1/18

10:06 am-12:30 am

1 stop13h 24m

Montreal Pierre Elliott Trudeau Intl

Sun 1/25

8:00 am-6:51 am

2 stops23h 51m

$422

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 1/17

8:32 pm-7:05 am

2 stops33h 33m

Montreal Pierre Elliott Trudeau Intl

Sun 1/25

4:35 pm-11:33 pm

1 stop7h 58m

$442

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 1/19

9:03 pm-7:05 am

2 stops33h 02m

Montreal Pierre Elliott Trudeau Intl

Sun 1/25

4:35 pm-11:33 pm

1 stop7h 58m

$443

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 1/18

10:06 am-12:30 am

1 stop13h 24m

Montreal Pierre Elliott Trudeau Intl

Fri 1/23

8:00 am-6:51 am

2 stops23h 51m

$449

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 1/20

6:46 pm-3:08 pm

1 stop19h 22m

Montreal Pierre Elliott Trudeau Intl

Fri 1/23

3:50 pm-10:20 am

1 stop19h 30m

$459

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 1/18

10:06 am-12:30 am

1 stop13h 24m

Montreal Pierre Elliott Trudeau Intl

Sun 1/25

4:35 pm-9:21 am

1 stop17h 46m

$466

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 1/20

6:00 am-10:44 pm

2 stops15h 44m

Montreal Pierre Elliott Trudeau Intl

Fri 1/23

3:50 pm-10:20 am

1 stop19h 30m

$468

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-9:33 am

1 stop18h 48m

$471

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 $1,021. Flights from St. Louis to Montreal on a Friday will generally be more expensive and average around $1,191. 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 $1,003. At noon is when there is more demand to fly to Montreal, so prices are often more expensive at around $1,086 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

$366

Fastest flight time

2h 35m

Direct flights

Tue, Wed 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 35m
Direct flights go from St. Louis to Montreal on Tuesday, Wednesday 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 35m.

  • 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
9,124 reviews
Search United Airlines flights
DeltaPriceFrom $255Free CancellationRating
7.9
8,016 reviews
Search Delta flights
Air CanadaPriceFrom $318Free CancellationRating
7.1
10,571 reviews
Search Air Canada flights
American AirlinesPriceFrom $348Free CancellationRating
7.2
11,074 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