Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from St. Louis to Montreal from $142

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 3/11. 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
3:49 pm - 12:30 am
STL
-
YUL
7h 41m
1 stop
Multiple Airlines Logo
5:25 pm - 11:59 pm
YUL
-
STL
31h 34m
2 stops
$330Multiple Airlines
Tue, Feb 24 - Wed, Mar 4
Multiple Airlines Logo
3:49 pm - 12:30 am
STL
-
YUL
7h 41m
1 stop
Multiple Airlines Logo
5:25 pm - 7:02 am
YUL
-
STL
14h 37m
2 stops
$364Multiple Airlines
Tue, Feb 24 - Fri, Mar 6
Multiple Airlines Logo
3:49 pm - 5:00 pm
STL
-
YUL
24h 11m
2 stops
Multiple Airlines Logo
4:35 pm - 7:02 am
YUL
-
STL
15h 27m
1 stop
$390Multiple Airlines
Wed, Feb 25 - Fri, Mar 6
Multiple Airlines Logo
3:49 pm - 12:30 am
STL
-
YUL
7h 41m
1 stop
Multiple Airlines Logo
4:35 pm - 7:02 am
YUL
-
STL
15h 27m
1 stop
$429Multiple Airlines
Tue, Feb 24 - Fri, Mar 6
Multiple Airlines Logo
3:49 pm - 12:30 am
STL
-
YUL
7h 41m
1 stop
Multiple Airlines Logo
8:00 am - 11:19 pm
YUL
-
STL
16h 19m
2 stops
$437Multiple Airlines
Mon, Mar 2 - Fri, Mar 13
Multiple Airlines Logo
3:49 pm - 12:30 am
STL
-
YUL
7h 41m
1 stop
Multiple Airlines Logo
6:45 am - 1:34 pm
YUL
-
STL
31h 49m
2 stops
$463Multiple Airlines
Sun, Mar 1 - Thu, Mar 12
Multiple Airlines Logo
3:49 pm - 12:30 am
STL
-
YUL
7h 41m
1 stop
Multiple Airlines Logo
12:52 pm - 4:42 pm
YUL
-
STL
4h 50m
1 stop
$491Multiple Airlines
Tue, Feb 24 - Wed, Mar 4
Multiple Airlines Logo
3:49 pm - 12:30 am
STL
-
YUL
7h 41m
1 stop
Multiple Airlines Logo
8:00 am - 11:19 pm
YUL
-
STL
16h 19m
2 stops
$505Multiple Airlines
Sun, Mar 1 - Fri, Mar 13
Multiple Airlines Logo
3:49 pm - 12:38 am
STL
-
YUL
31h 49m
2 stops
Multiple Airlines Logo
4:35 pm - 10:27 pm
YUL
-
STL
30h 52m
1 stop
$507Multiple Airlines
Tue, Feb 17 - Tue, Feb 24
Multiple Airlines Logo
3:49 pm - 12:30 am
STL
-
YUL
7h 41m
1 stop
Multiple Airlines Logo
7:00 am - 1:34 pm
YUL
-
STL
7h 34m
1 stop
$510Multiple Airlines
Mon, Mar 2 - Fri, Mar 13

United Airlines flights from St. Louis to Montreal

Our best United Airlines deals on St. Louis to Montreal flight tickets
United Airlines
Feb 18
STL8:17 amLambert-St Louis
9h 23m
1 stop
YUL6:40 pmMontreal Pierre Elliott Trudeau Intl
Feb 25
YUL1:10 pmMontreal Pierre Elliott Trudeau Intl
9h 30m
1 stop
STL9:40 pmLambert-St Louis
$556
United Airlines
Feb 17
STL9:55 amLambert-St Louis
7h 45m
1 stop
YUL6:40 pmMontreal Pierre Elliott Trudeau Intl
Feb 24
YUL4:45 pmMontreal Pierre Elliott Trudeau Intl
18h 51m
1 stop
STL10:36 amLambert-St Louis
$566
United Airlines
Feb 19
STL6:25 amLambert-St Louis
8h 36m
1 stop
YUL4:01 pmMontreal Pierre Elliott Trudeau Intl
Feb 26
YUL1:10 pmMontreal Pierre Elliott Trudeau Intl
9h 30m
1 stop
STL9:40 pmLambert-St Louis
$570

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
Feb 17
STL6:00 amLambert-St Louis
8h 04m
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
$526
American Airlines
Feb 25
STL6:00 amLambert-St Louis
8h 04m
1 stop
YUL3:04 pmMontreal Pierre Elliott Trudeau Intl
Mar 6
YUL3:45 pmMontreal Pierre Elliott Trudeau Intl
19h 28m
1 stop
STL10:13 amLambert-St Louis
$528
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
$536

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 22, 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 2/24

3:49 pm-12:30 am

1 stop7h 41m

Montreal Pierre Elliott Trudeau Intl

Wed 3/4

5:25 pm-11:59 pm

2 stops31h 34m

$330

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/24

3:49 pm-12:30 am

1 stop7h 41m

Montreal Pierre Elliott Trudeau Intl

Fri 3/6

5:25 pm-7:02 am

2 stops14h 37m

$364

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 2/25

3:49 pm-5:00 pm

2 stops24h 11m

Montreal Pierre Elliott Trudeau Intl

Fri 3/6

4:35 pm-7:02 am

1 stop15h 27m

$390

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/24

3:49 pm-12:30 am

1 stop7h 41m

Montreal Pierre Elliott Trudeau Intl

Fri 3/6

4:35 pm-7:02 am

1 stop15h 27m

$429

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

Fri 3/13

8:00 am-11:19 pm

2 stops16h 19m

$437

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 3/1

3:49 pm-12:30 am

1 stop7h 41m

Montreal Pierre Elliott Trudeau Intl

Thu 3/12

6:45 am-1:34 pm

2 stops31h 49m

$463

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/24

3:49 pm-12:30 am

1 stop7h 41m

Montreal Pierre Elliott Trudeau Intl

Wed 3/4

12:52 pm-4:42 pm

1 stop4h 50m

$491

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sun 3/1

3:49 pm-12:30 am

1 stop7h 41m

Montreal Pierre Elliott Trudeau Intl

Fri 3/13

8:00 am-11:19 pm

2 stops16h 19m

$505

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/17

3:49 pm-12:38 am

2 stops31h 49m

Montreal Pierre Elliott Trudeau Intl

Tue 2/24

4:35 pm-10:27 pm

1 stop30h 52m

$507

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

Fri 3/13

7:00 am-1:34 pm

1 stop7h 34m

$510

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 $1,007. Flights from St. Louis to Montreal on a Friday will generally be more expensive and average around $1,165. 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 $961. At noon is when there is more demand to fly to Montreal, so prices are often more expensive at around $1,071 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

Thu, Fri, Sat and Sun

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 Thursday, Friday, Saturday and Sunday. 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
8,087 reviews
Search Delta flights
United AirlinesPriceFrom $246Free CancellationRating
7.4
9,192 reviews
Search United Airlines flights
Air CanadaPriceFrom $259Free CancellationRating
7.1
10,646 reviews
Search Air Canada flights
American AirlinesPriceFrom $348Free CancellationRating
7.2
11,173 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
Sat 2/21
Sat 2/28
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