Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from St. Louis to Montreal from $109

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 2/3. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from St. Louis to Montreal

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
10:09 pm - 7:05 am
STL
-
YUL
31h 56m2 stops
Multiple Airlines Logo
4:35 pm - 9:21 am
YUL
-
STL
17h 46m1 stop
$308Multiple Airlines
Sun, Jan 18 - Sun, Jan 25
Multiple Airlines Logo
8:22 pm - 3:10 pm
STL
-
YUL
17h 48m2 stops
Multiple Airlines Logo
4:35 pm - 9:21 am
YUL
-
STL
17h 46m1 stop
$346Multiple Airlines
Wed, Jan 21 - Sun, Jan 25
Multiple Airlines Logo
10:06 am - 12:30 am
STL
-
YUL
13h 24m1 stop
Multiple Airlines Logo
6:45 am - 11:11 am
YUL
-
STL
29h 26m2 stops
$349Multiple Airlines
Sun, Jan 18 - Fri, Jan 23
Multiple Airlines Logo
10:06 am - 12:30 am
STL
-
YUL
13h 24m1 stop
Multiple Airlines Logo
8:00 am - 11:33 pm
YUL
-
STL
40h 33m2 stops
$351Multiple Airlines
Sun, Jan 18 - Wed, Jan 28
American Airlines Logo
6:44 pm - 3:08 pm
STL
-
YUL
19h 24m1 stop
American Airlines Logo
7:30 am - 6:14 pm
YUL
-
STL
11h 44m2 stops
$358American Airlines
Mon, Feb 2 - Wed, Feb 4
American Airlines Logo
11:05 am - 10:59 pm
STL
-
YUL
10h 54m2 stops
American Airlines Logo
7:30 am - 6:14 pm
YUL
-
STL
11h 44m2 stops
$363American Airlines
Mon, Feb 2 - Wed, Feb 4
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
$369Multiple Airlines
Sun, Jan 18 - Sun, Jan 25
Multiple Airlines Logo
5:42 pm - 12:43 am
STL
-
YUL
30h 01m2 stops
Multiple Airlines Logo
4:35 pm - 9:21 am
YUL
-
STL
17h 46m1 stop
$388Multiple Airlines
Tue, Jan 20 - Sun, Jan 25
Multiple Airlines Logo
10:06 am - 12:30 am
STL
-
YUL
13h 24m1 stop
Multiple Airlines Logo
6:45 am - 11:33 pm
YUL
-
STL
17h 48m2 stops
$393Multiple Airlines
Sun, Jan 18 - Mon, Jan 26
Multiple Airlines Logo
1:35 pm - 7:05 am
STL
-
YUL
16h 30m2 stops
Multiple Airlines Logo
4:35 pm - 9:21 am
YUL
-
STL
17h 46m1 stop
$402Multiple Airlines
Fri, Jan 16 - Sun, Jan 25

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
Feb 19
STL6:33 pmLambert-St Louis
19h 32m
1 stop
YUL3:05 pmMontreal Pierre Elliott Trudeau Intl
Feb 24
YUL3:55 pmMontreal Pierre Elliott Trudeau Intl
18h 34m
1 stop
STL9:29 amLambert-St Louis
$349
Find similar
American Airlines
Feb 2
STL6:44 pmLambert-St Louis
19h 24m
1 stop
YUL3:08 pmMontreal Pierre Elliott Trudeau Intl
Feb 4
YUL7:30 amMontreal Pierre Elliott Trudeau Intl
11h 44m
2 stops
STL6:14 pmLambert-St Louis
$358
Find similar
American Airlines
Feb 2
STL11:05 amLambert-St Louis
10h 54m
2 stops
YUL10:59 pmMontreal Pierre Elliott Trudeau Intl
Feb 4
YUL7:30 amMontreal Pierre Elliott Trudeau Intl
11h 44m
2 stops
STL6:14 pmLambert-St Louis
$363
Find similar

Delta flights from St. Louis to Montreal

Our best Delta deals on St. Louis to Montreal flight tickets
Delta
Apr 16
STL6:05 amLambert-St Louis
25h 35m
1 stop
YUL8:40 amMontreal Pierre Elliott Trudeau Intl
Apr 20
YUL2:29 pmMontreal Pierre Elliott Trudeau Intl
22h 55m
1 stop
STL12:24 pmLambert-St Louis
$583
Find similar
Delta
Feb 4
STL6:00 amLambert-St Louis
11h 37m
2 stops
YUL6:37 pmMontreal Pierre Elliott Trudeau Intl
Feb 11
YUL9:34 amMontreal Pierre Elliott Trudeau Intl
12h 03m
2 stops
STL8:37 pmLambert-St Louis
$624
Find similar
Delta
Feb 26
STL7:10 amLambert-St Louis
10h 25m
2 stops
YUL6:35 pmMontreal Pierre Elliott Trudeau Intl
Mar 2
YUL9:29 amMontreal Pierre Elliott Trudeau Intl
12h 14m
2 stops
STL8:43 pmLambert-St Louis
$646
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 23, 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

Sun 1/18

10:09 pm-7:05 am

2 stops31h 56m

Montreal Pierre Elliott Trudeau Intl

Sun 1/25

4:35 pm-9:21 am

1 stop17h 46m

$308

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 1/21

8:22 pm-3:10 pm

2 stops17h 48m

Montreal Pierre Elliott Trudeau Intl

Sun 1/25

4:35 pm-9:21 am

1 stop17h 46m

$346

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

6:45 am-11:11 am

2 stops29h 26m

$349

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

Wed 1/28

8:00 am-11:33 pm

2 stops40h 33m

$351

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 2/2

6:44 pm-3:08 pm

1 stop19h 24m

Montreal Pierre Elliott Trudeau Intl

Wed 2/4

7:30 am-6:14 pm

2 stops11h 44m

$358

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 2/2

11:05 am-10:59 pm

2 stops10h 54m

Montreal Pierre Elliott Trudeau Intl

Wed 2/4

7:30 am-6:14 pm

2 stops11h 44m

$363

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

$369

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 1/20

5:42 pm-12:43 am

2 stops30h 01m

Montreal Pierre Elliott Trudeau Intl

Sun 1/25

4:35 pm-9:21 am

1 stop17h 46m

$388

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

Mon 1/26

6:45 am-11:33 pm

2 stops17h 48m

$393

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 1/16

1:35 pm-7:05 am

2 stops16h 30m

Montreal Pierre Elliott Trudeau Intl

Sun 1/25

4:35 pm-9:21 am

1 stop17h 46m

$402

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 $1,026. Flights from St. Louis to Montreal on a Friday will generally be more expensive and average around $1,187. 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 $1,089 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

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 $724.
The fastest flight from St. Louis to Montreal takes 2h 35m
Direct flights go from St. Louis to Montreal on 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
9,106 reviews
Search United Airlines flights
DeltaPriceFrom $255Free CancellationRating
7.9
8,015 reviews
Search Delta flights
Air CanadaPriceFrom $318Free CancellationRating
7.1
10,551 reviews
Search Air Canada flights
American AirlinesPriceFrom $348Free CancellationRating
7.2
11,051 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.

An easier way to manage your Montreal trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Thu 1/22
Thu 1/29
By creating a price alert you accept our terms of use and privacy policy.

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