Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Montreal to St. Louis from $288

1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Montreal to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
12:08 pm - 7:58 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
8h 50m1 stop Chicago O'Hare Intl
American Airlines Logo
8:24 pm - 11:28 amSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
14h 04m1 stop Chicago O'Hare Intl
$439American Airlines
Thu, Dec 3 - Mon, Dec 7
Multiple Airlines Logo
6:45 am - 11:17 amYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
29h 32m3 stops Toronto Pearson Intl Fort Lauderdale Atlanta Hartsfield-Jackson
Multiple Airlines Logo
12:02 pm - 4:00 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
26h 58m3 stops Atlanta Hartsfield-Jackson Newark Toronto Island
$454Multiple Airlines
Thu, Dec 3 - Mon, Dec 7
American Airlines Logo
12:08 pm - 7:58 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
8h 50m1 stop Chicago O'Hare Intl
American Airlines Logo
8:24 pm - 11:28 amSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
14h 04m1 stop Chicago O'Hare Intl
$455American Airlines
Thu, Dec 3 - Mon, Dec 7
American Airlines Logo
12:08 pm - 10:25 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
11h 17m1 stop Chicago O'Hare Intl
American Airlines Logo
11:25 am - 10:48 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
10h 23m2 stops Chicago O'Hare Intl Philadelphia
$462American Airlines
Sat, Dec 5 - Sat, Dec 12
Multiple Airlines Logo
6:45 am - 11:17 amYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
29h 32m3 stops Toronto Pearson Intl Fort Lauderdale Atlanta Hartsfield-Jackson
Multiple Airlines Logo
12:02 pm - 4:00 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
26h 58m3 stops Atlanta Hartsfield-Jackson Newark Toronto Island
$500Multiple Airlines
Thu, Dec 3 - Mon, Dec 7
Multiple Airlines Logo
6:25 pm - 11:17 amYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
17h 52m2 stops Washington, D.C. Dulles Intl Atlanta Hartsfield-Jackson
Multiple Airlines Logo
12:02 pm - 8:32 amSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
19h 30m2 stops Atlanta Hartsfield-Jackson Newark
$515Multiple Airlines
Thu, Dec 3 - Mon, Dec 7
Multiple Airlines Logo
6:25 pm - 11:17 amYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
17h 52m2 stops Washington, D.C. Dulles Intl Atlanta Hartsfield-Jackson
Multiple Airlines Logo
12:02 pm - 7:46 amSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
18h 44m2 stops Atlanta Hartsfield-Jackson Baltimore/Washington
$541Multiple Airlines
Thu, Dec 3 - Mon, Dec 7
Multiple Airlines Logo
6:25 pm - 10:57 amYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
17h 32m3 stops Washington, D.C. Dulles Intl Atlanta Hartsfield-Jackson Denver Intl
Multiple Airlines Logo
12:02 pm - 8:32 amSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
19h 30m2 stops Atlanta Hartsfield-Jackson Newark
$552Multiple Airlines
Thu, Dec 3 - Mon, Dec 7
Air Canada Logo
10:10 am - 3:26 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
6h 16m1 stop Toronto Pearson Intl
Air Canada Logo
4:05 pm - 10:00 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
4h 55m1 stop Toronto Pearson Intl
$840Air Canada
Mon, Dec 21 - Mon, Dec 28
Air Canada Logo
10:10 am - 3:26 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
6h 16m1 stop Toronto Pearson Intl
Air Canada Logo
4:05 pm - 11:55 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
6h 50m1 stop Toronto Pearson Intl
$860Air Canada
Wed, Dec 23 - Sat, Jan 2

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

United Airlines flights from Montreal to St. Louis

Our best United Airlines deals on Montreal to St. Louis flight tickets
United Airlines
Jan 29
YUL9:25 amMontreal Pierre Elliott Trudeau Intl
8h 48m
1 stop
STL5:13 pmLambert-St Louis
Feb 2
STL5:00 amLambert-St Louis
11h 07m
1 stop
YUL5:07 pmMontreal Pierre Elliott Trudeau Intl
$627
United Airlines
Jan 29
YUL4:45 pmMontreal Pierre Elliott Trudeau Intl
20h 28m
1 stop
STL12:13 pmLambert-St Louis
Feb 2
STL8:05 amLambert-St Louis
9h 52m
1 stop
YUL6:57 pmMontreal Pierre Elliott Trudeau Intl
$644
United Airlines
Dec 30
YUL6:00 amMontreal Pierre Elliott Trudeau Intl
5h 42m
1 stop
STL10:42 amLambert-St Louis
Jan 7
STL9:05 amLambert-St Louis
8h 52m
1 stop
YUL6:57 pmMontreal Pierre Elliott Trudeau Intl
$753

WestJet flights from Montreal to St. Louis

Our best WestJet deals on Montreal to St. Louis flight tickets
WestJet
Dec 3
YUL6:45 amMontreal Pierre Elliott Trudeau Intl
11h 35m
2 stops
STL5:20 pmLambert-St Louis
Dec 7
STL5:31 pmLambert-St Louis
5h 17m
1 stop
YUL11:48 pmMontreal Pierre Elliott Trudeau Intl
$803
WestJet
Nov 28
YUL6:45 amMontreal Pierre Elliott Trudeau Intl
35h 29m
2 stops
STL5:14 pmLambert-St Louis
Nov 30
STL5:30 pmLambert-St Louis
23h 03m
1 stop
YUL5:33 pmMontreal Pierre Elliott Trudeau Intl
$843
WestJet
Nov 28
YUL6:45 amMontreal Pierre Elliott Trudeau Intl
27h 40m
2 stops
STL9:25 amLambert-St Louis
Nov 30
STL5:30 pmLambert-St Louis
30h 00m
2 stops
YUL12:30 amMontreal Pierre Elliott Trudeau Intl
$868

momondo Fare Finder

 
Use the filters below to find and compare flights from Montreal to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 12/3

12:08 pm-7:58 pm

1 stop8h 50m

Lambert-St Louis

Mon 12/7

8:24 pm-11:28 am

1 stop14h 04m

$439

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 12/3

6:45 am-11:17 am

3 stops29h 32m

Lambert-St Louis

Mon 12/7

12:02 pm-4:00 pm

3 stops26h 58m

$454

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 12/3

12:08 pm-7:58 pm

1 stop8h 50m

Lambert-St Louis

Mon 12/7

8:24 pm-11:28 am

1 stop14h 04m

$455

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sat 12/5

12:08 pm-10:25 pm

1 stop11h 17m

Lambert-St Louis

Sat 12/12

11:25 am-10:48 pm

2 stops10h 23m

$462

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 12/3

6:45 am-11:17 am

3 stops29h 32m

Lambert-St Louis

Mon 12/7

12:02 pm-4:00 pm

3 stops26h 58m

$500

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 12/3

6:25 pm-11:17 am

2 stops17h 52m

Lambert-St Louis

Mon 12/7

12:02 pm-8:32 am

2 stops19h 30m

$515

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 12/3

6:25 pm-11:17 am

2 stops17h 52m

Lambert-St Louis

Mon 12/7

12:02 pm-7:46 am

2 stops18h 44m

$541

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 12/3

6:25 pm-10:57 am

3 stops17h 32m

Lambert-St Louis

Mon 12/7

12:02 pm-8:32 am

2 stops19h 30m

$552
Quickest round-trip

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 12/21

10:10 am-3:26 pm

1 stop6h 16m

Lambert-St Louis

Mon 12/28

4:05 pm-10:00 pm

1 stop4h 55m

$840

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 12/23

10:10 am-3:26 pm

1 stop6h 16m

Lambert-St Louis

Sat 1/2

4:05 pm-11:55 pm

1 stop6h 50m

$860

Flights are sorted by cheapest round-trip flights first.

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

See travel insights to St. Louis from

How to get the cheapest flight ticket from Montreal to St. Louis

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 typical price of a round-trip flight between Montreal and St. Louis?

Prices are currently low for flights on this route.

Typical prices usually range from $558 to $638.
The lowest price recently found on this route was $439.

What is the cheapest month to fly to St. Louis?

In general, August is the cheapest month to fly from Montreal to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $442. The month of May is another great option to travel to St. Louis, with average flight prices from Montreal averaging around $548.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Thursday when prices can be found for as low as $538. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $690. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest Montreal to Lambert-St Louis flight route?

Fly from Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis for the best Montreal - Lambert-St Louis flight prices

What cabin class options are available on Montreal to St. Louis flights?

There is only 1 cabin class available to choose from on Montreal to St. Louis 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 Montreal to St. Louis flights?

You could potentially save up to 15% on your flight if you consider stops on a Montreal to St. Louis flight.

When to book flights from Montreal to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Montreal to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Montreal to St. Louis (YMQ to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Montreal to St. Louis

Best Price Found

$288

Fastest flight time

7h 58m

Direct flights

None
The best one-way flight to St. Louis from Montreal in the past 72 hours is $288. The best round-trip flight deal from Montreal to St. Louis found on momondo in the last 72 hours is $439.
The fastest flight from Montreal to St. Louis takes 7h 58m
There are no direct flights from Montreal to St. Louis. There are no popular flight routes from Montreal to St. Louis.
Search flight deals

Frequently asked questions about flying from Montreal to St. Louis

  • How far is Montreal to Lambert-St Louis by plane?

    A flight from Montreal to Lambert-St Louis will travel around 973.0 mi. Typically, this will take 7h 58m by plane in normal conditions.

  • When did momondo last update prices for flights from Montreal to Lambert-St Louis Airport?

    Prices for flights from Montreal to Lambert-St Louis Airport were last updated today.

  • How many operators does momondo search for flights from Montreal to Lambert-St Louis Airport?

  • How old do you have to be to fly from Montreal to Lambert-St Louis Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Montreal to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents required for your trip to Lambert-St Louis Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Montreal to St. Louis?

Best airlines flying from Montreal to St. Louis

Compare and see reviews for airlines that fly from Montreal to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom $478Free CancellationRating
7.1
11,870 reviews
Search Air Canada flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Fairview Heights
Maryland Heights
St. Peters
Alton
Collinsville
Farmington
Florissant
Festus
Hermann
Clayton
Fenton
Edwardsville
O'Fallon
Eureka
Wentzville
Litchfield
Grafton
Waterloo

Why use momondo?

Why should I use momondo to find a flight deal from Montreal to St. Louis?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Montreal to St. Louis. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Montreal to St. Louis with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Montreal to St. Louis flights to just show those with flexible booking policies.

How can momondo help me find flights from Montreal to St. Louis?

Once all potential Montreal to St. Louis 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 Montreal to St. Louis right now. Can momondo alert me if prices change?

If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from Montreal and alert you when they change.

An easier way to manage your St. Louis 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
Mon 12/7
Mon 12/14
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States