Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Montreal to St. Louis from $207

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Montreal to St. Louis departing on 6/17. 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 Montreal to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
5:33 pm - 11:54 pm
YUL
-
STL
7h 21m
1 stop
American Airlines Logo
7:30 am - 10:59 pm
STL
-
YUL
14h 29m
1 stop
$440American Airlines
Fri, May 22 - Fri, May 29
Air Canada Logo
7:00 am - 12:06 pm
YUL
-
STL
6h 06m
1 stop
Air Canada Logo
1:05 pm - 4:40 pm
STL
-
YUL
2h 35mnonstop
$441Air Canada
Thu, May 21 - Mon, May 25
Air Canada Logo
6:30 pm - 8:25 pm
YUL
-
STL
2h 55mnonstop
Air Canada Logo
7:05 am - 3:26 pm
STL
-
YUL
7h 21m
2 stops
$445Air Canada
Thu, May 21 - Mon, May 25
American Airlines Logo
12:30 pm - 4:30 pm
YUL
-
STL
5h 00m
1 stop
American Airlines Logo
2:56 pm - 9:50 am
STL
-
YUL
17h 54m
1 stop
$446American Airlines
Fri, May 29 - Mon, Jun 1
Air Canada Logo
6:30 pm - 8:25 pm
YUL
-
STL
2h 55mnonstop
Air Canada Logo
1:05 pm - 4:40 pm
STL
-
YUL
2h 35mnonstop
$453Air Canada
Mon, May 25 - Fri, May 29
Air Canada Logo
6:30 pm - 8:25 pm
YUL
-
STL
2h 55mnonstop
Air Canada Logo
2:15 pm - 9:50 pm
STL
-
YUL
6h 35m
1 stop
$454Air Canada
Tue, Jun 2 - Tue, Jun 9
Air Canada Logo
3:40 pm - 8:09 pm
YUL
-
STL
5h 29m
1 stop
Air Canada Logo
1:05 pm - 4:40 pm
STL
-
YUL
2h 35mnonstop
$455Air Canada
Fri, May 22 - Fri, May 29
Air Canada Logo
4:55 pm - 6:42 pm
YUL
-
STL
2h 47mnonstop
Air Canada Logo
12:10 pm - 3:42 pm
STL
-
YUL
2h 32mnonstop
$457Air Canada
Fri, Jul 31 - Sun, Aug 2
Delta Logo
6:00 am - 9:29 am
YUL
-
STL
4h 29m
1 stop
Delta Logo
5:15 pm - 11:57 pm
STL
-
YUL
5h 42m
1 stop
$459Delta
Tue, Jun 2 - Wed, Jun 3
United Airlines Logo
9:15 am - 6:13 pm
YUL
-
STL
9h 58m
2 stops
United Airlines Logo
6:00 am - 12:13 am
STL
-
YUL
17h 13m
2 stops
$460United Airlines
Fri, May 22 - Fri, May 29

Delta flights from Montreal to St. Louis

Our best Delta deals on Montreal to St. Louis flight tickets
Delta
May 24
YUL12:49 pmMontreal Pierre Elliott Trudeau Intl
9h 20m
1 stop
STL9:09 pmLambert-St Louis
May 30
STL6:04 pmLambert-St Louis
4h 09m
1 stop
YUL11:13 pmMontreal Pierre Elliott Trudeau Intl
$459
Delta
Jun 25
YUL6:50 pmMontreal Pierre Elliott Trudeau Intl
6h 06m
1 stop
STL11:56 pmLambert-St Louis
Jun 29
STL6:30 amLambert-St Louis
8h 41m
1 stop
YUL4:11 pmMontreal Pierre Elliott Trudeau Intl
$467
Delta
Oct 15
YUL6:00 amMontreal Pierre Elliott Trudeau Intl
4h 36m
1 stop
STL9:36 amLambert-St Louis
Oct 19
STL5:30 pmLambert-St Louis
5h 21m
1 stop
YUL11:51 pmMontreal Pierre Elliott Trudeau Intl
$474

American Airlines flights from Montreal to St. Louis

Our best American Airlines deals on Montreal to St. Louis flight tickets
American Airlines
May 22
YUL5:33 pmMontreal Pierre Elliott Trudeau Intl
7h 21m
1 stop
STL11:54 pmLambert-St Louis
May 29
STL7:30 amLambert-St Louis
14h 29m
1 stop
YUL10:59 pmMontreal Pierre Elliott Trudeau Intl
$440
American Airlines
May 29
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
5h 00m
1 stop
STL4:30 pmLambert-St Louis
Jun 1
STL2:56 pmLambert-St Louis
17h 54m
1 stop
YUL9:50 amMontreal Pierre Elliott Trudeau Intl
$446
American Airlines
Jun 12
YUL5:33 pmMontreal Pierre Elliott Trudeau Intl
7h 43m
1 stop
STL12:16 amLambert-St Louis
Jun 14
STL6:15 amLambert-St Louis
14h 23m
1 stop
YUL9:38 pmMontreal Pierre Elliott Trudeau Intl
$466

momondo Fare Finder

 
Customize your flight search to find flights from Montreal to St. Louis 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 May 7, 2026.
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 - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 5/22

5:33 pm-11:54 pm

1 stop7h 21m

Lambert-St Louis

Fri 5/29

7:30 am-10:59 pm

1 stop14h 29m

$440

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 5/21

7:00 am-12:06 pm

1 stop6h 06m

Lambert-St Louis

Mon 5/25

1:05 pm-4:40 pm

Nonstop2h 35m

$441

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 5/21

6:30 pm-8:25 pm

Nonstop2h 55m

Lambert-St Louis

Mon 5/25

7:05 am-3:26 pm

2 stops7h 21m

$445

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 5/29

12:30 pm-4:30 pm

1 stop5h 00m

Lambert-St Louis

Mon 6/1

2:56 pm-9:50 am

1 stop17h 54m

$446

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 5/25

6:30 pm-8:25 pm

Nonstop2h 55m

Lambert-St Louis

Fri 5/29

1:05 pm-4:40 pm

Nonstop2h 35m

$453

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 6/2

6:30 pm-8:25 pm

Nonstop2h 55m

Lambert-St Louis

Tue 6/9

2:15 pm-9:50 pm

1 stop6h 35m

$454

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 5/22

3:40 pm-8:09 pm

1 stop5h 29m

Lambert-St Louis

Fri 5/29

1:05 pm-4:40 pm

Nonstop2h 35m

$455
Quickest round-trip

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 7/31

4:55 pm-6:42 pm

Nonstop2h 47m

Lambert-St Louis

Sun 8/2

12:10 pm-3:42 pm

Nonstop2h 32m

$457

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 6/2

6:00 am-9:29 am

1 stop4h 29m

Lambert-St Louis

Wed 6/3

5:15 pm-11:57 pm

1 stop5h 42m

$459

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 5/22

9:15 am-6:13 pm

2 stops9h 58m

Lambert-St Louis

Fri 5/29

6:00 am-12:13 am

2 stops17h 13m

$460

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?

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

In general, December 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 $277. The month of July is another great option to travel to St. Louis, with average flight prices from Montreal averaging around $286.

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 Tuesday when prices can be found for as low as $326. 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

Can stopping save me money on Montreal to St. Louis flights?

No. A direct flight is the cheapest option for a flight between Montreal to St. Louis.

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

$270

Fastest flight time

2h 47m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Montreal in the past 72 hours is $270. The best round-trip flight deal from Montreal to St. Louis found on momondo in the last 72 hours is $669.
The fastest flight from Montreal to St. Louis takes 2h 47m
Direct flights go from Montreal to St. Louis every day.
There is 1 airport in St. Louis. From Montreal there are direct flights to Lambert-St Louis (STL).
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 2h 47m 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 $499Free CancellationRating
7.1
11,004 reviews
Search Air Canada flights

  • Air Canada Flights From Montreal to St. Louis

    The lowest priced Air Canada flight from Montreal to St. Louis from the last 72 hours was $499. Generally, Air Canada has 7 flights on this route every week with an average price of $589. Air Canada is rated 7.1/10 by our users.

Traveling to a place near St. Louis?

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

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
Sat 6/6
Sat 6/13
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States