Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from St. Louis to Montreal from $188

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 4/17. 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.
American Airlines Logo
4:46 pm - 11:44 am
STL
-
YUL
17h 58m
1 stop
American Airlines Logo
12:30 pm - 10:14 pm
YUL
-
STL
10h 44m
1 stop
$343American Airlines
Tue, Apr 7 - Thu, Apr 9
American Airlines Logo
6:00 am - 3:04 pm
STL
-
YUL
8h 04m
1 stop
American Airlines Logo
3:45 pm - 10:13 am
YUL
-
STL
19h 28m
1 stop
$368American Airlines
Tue, Feb 17 - Fri, Feb 20
Multiple Airlines Logo
8:24 am - 12:30 am
STL
-
YUL
15h 06m
1 stop
Multiple Airlines Logo
5:10 pm - 11:25 pm
YUL
-
STL
31h 15m
2 stops
$422Multiple Airlines
Fri, Apr 3 - Mon, Apr 6
Multiple Airlines Logo
4:55 pm - 12:30 am
STL
-
YUL
30h 35m
1 stop
Multiple Airlines Logo
5:10 pm - 6:50 am
YUL
-
STL
14h 40m
2 stops
$437Multiple Airlines
Wed, Apr 22 - Sun, Apr 26
American Airlines Logo
9:37 am - 2:58 pm
STL
-
YUL
4h 21m
1 stop
American Airlines Logo
12:30 pm - 10:14 pm
YUL
-
STL
10h 44m
1 stop
$481American Airlines
Mon, Apr 6 - Thu, Apr 9
American Airlines Logo
6:14 am - 3:20 pm
STL
-
YUL
8h 06m
1 stop
American Airlines Logo
3:45 pm - 10:03 am
YUL
-
STL
19h 18m
1 stop
$486American Airlines
Sat, Mar 21 - Tue, Mar 24
American Airlines Logo
6:54 pm - 1:52 pm
STL
-
YUL
17h 58m
1 stop
American Airlines Logo
12:30 pm - 10:14 pm
YUL
-
STL
10h 44m
1 stop
$487American Airlines
Fri, May 1 - Mon, May 4
American Airlines Logo
6:33 pm - 3:05 pm
STL
-
YUL
19h 32m
1 stop
American Airlines Logo
7:30 am - 5:58 pm
YUL
-
STL
11h 28m
2 stops
$496American Airlines
Sat, Mar 21 - Tue, Mar 24
Multiple Airlines Logo
8:24 am - 12:30 am
STL
-
YUL
15h 06m
1 stop
Multiple Airlines Logo
4:35 pm - 7:51 am
YUL
-
STL
16h 16m
1 stop
$512Multiple Airlines
Fri, Apr 3 - Sun, Apr 5
Multiple Airlines Logo
8:24 am - 12:30 am
STL
-
YUL
15h 06m
1 stop
Multiple Airlines Logo
7:00 am - 11:59 pm
YUL
-
STL
17h 59m
2 stops
$517Multiple Airlines
Fri, Apr 3 - Sun, Apr 5

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets
American Airlines
Apr 7
STL4:46 pmLambert-St Louis
17h 58m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
Apr 9
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
10h 44m
1 stop
STL10:14 pmLambert-St Louis
$343
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
$368
American Airlines
Apr 6
STL9:37 amLambert-St Louis
4h 21m
1 stop
YUL2:58 pmMontreal Pierre Elliott Trudeau Intl
Apr 9
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
10h 44m
1 stop
STL10:14 pmLambert-St Louis
$481

Air Canada flights from St. Louis to Montreal

Our best Air Canada deals on St. Louis to Montreal flight tickets
Air Canada
May 1
STL1:00 pmLambert-St Louis
2h 35m
YUL4:35 pmMontreal Pierre Elliott Trudeau Intl
May 4
YUL6:10 pmMontreal Pierre Elliott Trudeau Intl
2h 55m
STL8:05 pmLambert-St Louis
$569
Air Canada
Jun 30
STL7:25 amLambert-St Louis
6h 57m
1 stop
YUL3:22 pmMontreal Pierre Elliott Trudeau Intl
Jul 3
YUL4:40 pmMontreal Pierre Elliott Trudeau Intl
2h 47m
STL6:27 pmLambert-St Louis
$582
Air Canada
May 1
STL1:00 pmLambert-St Louis
2h 35m
YUL4:35 pmMontreal Pierre Elliott Trudeau Intl
May 4
YUL8:10 amMontreal Pierre Elliott Trudeau Intl
4h 56m
1 stop
STL12:06 pmLambert-St Louis
$583

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 29, 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 4/7

4:46 pm-11:44 am

1 stop17h 58m

Montreal Pierre Elliott Trudeau Intl

Thu 4/9

12:30 pm-10:14 pm

1 stop10h 44m

$343

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Tue 2/17

6:00 am-3:04 pm

1 stop8h 04m

Montreal Pierre Elliott Trudeau Intl

Fri 2/20

3:45 pm-10:13 am

1 stop19h 28m

$368

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 4/3

8:24 am-12:30 am

1 stop15h 06m

Montreal Pierre Elliott Trudeau Intl

Mon 4/6

5:10 pm-11:25 pm

2 stops31h 15m

$422

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 4/22

4:55 pm-12:30 am

1 stop30h 35m

Montreal Pierre Elliott Trudeau Intl

Sun 4/26

5:10 pm-6:50 am

2 stops14h 40m

$437

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 4/6

9:37 am-2:58 pm

1 stop4h 21m

Montreal Pierre Elliott Trudeau Intl

Thu 4/9

12:30 pm-10:14 pm

1 stop10h 44m

$481

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 3/21

6:14 am-3:20 pm

1 stop8h 06m

Montreal Pierre Elliott Trudeau Intl

Tue 3/24

3:45 pm-10:03 am

1 stop19h 18m

$486

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 5/1

6:54 pm-1:52 pm

1 stop17h 58m

Montreal Pierre Elliott Trudeau Intl

Mon 5/4

12:30 pm-10:14 pm

1 stop10h 44m

$487

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Sat 3/21

6:33 pm-3:05 pm

1 stop19h 32m

Montreal Pierre Elliott Trudeau Intl

Tue 3/24

7:30 am-5:58 pm

2 stops11h 28m

$496

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 4/3

8:24 am-12:30 am

1 stop15h 06m

Montreal Pierre Elliott Trudeau Intl

Sun 4/5

4:35 pm-7:51 am

1 stop16h 16m

$512

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Fri 4/3

8:24 am-12:30 am

1 stop15h 06m

Montreal Pierre Elliott Trudeau Intl

Sun 4/5

7:00 am-11:59 pm

2 stops17h 59m

$517

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 Monday when prices can be found for as low as $1,006. 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 $1,067 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 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 $676.
The fastest flight from St. Louis to Montreal takes 2h 32m
Direct flights go from St. Louis to Montreal on 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
DeltaPriceFrom $212Free CancellationRating
7.9
8,127 reviews
Search Delta flights
United AirlinesPriceFrom $246Free CancellationRating
7.4
9,215 reviews
Search United Airlines flights
Air CanadaPriceFrom $285Free CancellationRating
7.1
10,667 reviews
Search Air Canada flights
American AirlinesPriceFrom $348Free CancellationRating
7.2
11,206 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 2/28
Sat 3/7
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