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Cheap flights from Montreal to St. Louis from $265

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 8/6. 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
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.
Air Canada Logo
4:55 pm - 6:41 pm
YUL
-
STL
2h 46mnonstop
Air Canada Logo
12:10 pm - 3:41 pm
STL
-
YUL
2h 31mnonstop
$480Air Canada
Thu, Oct 15 - Mon, Oct 19
Air Canada Logo
4:55 pm - 6:41 pm
YUL
-
STL
2h 46mnonstop
Air Canada Logo
12:10 pm - 3:41 pm
STL
-
YUL
2h 31mnonstop
$481Air Canada
Thu, Oct 15 - Mon, Oct 19
Air Canada Logo
4:55 pm - 6:41 pm
YUL
-
STL
2h 46mnonstop
Air Canada Logo
12:10 pm - 3:41 pm
STL
-
YUL
2h 31mnonstop
$484Air Canada
Thu, Oct 15 - Mon, Oct 19
Delta Logo
6:00 am - 1:20 pm
YUL
-
STL
8h 20m
1 stop
Delta Logo
5:45 pm - 11:10 pm
STL
-
YUL
4h 25m
1 stop
$485Delta
Tue, Oct 27 - Wed, Oct 28
United Airlines Logo
6:00 am - 3:43 pm
YUL
-
STL
10h 43m
2 stops
United Airlines Logo
8:00 am - 7:45 pm
STL
-
YUL
10h 45m
2 stops
$486United Airlines
Thu, Oct 1 - Wed, Oct 7
Air Canada Logo
8:40 am - 2:02 pm
YUL
-
STL
6h 22m
2 stops
Air Canada Logo
12:10 pm - 3:42 pm
STL
-
YUL
2h 32mnonstop
$487Air Canada
Thu, Jul 9 - Sun, Jul 12
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
$488Air Canada
Fri, Jul 24 - Sun, Jul 26
Air Canada Logo
8:40 am - 2:02 pm
YUL
-
STL
6h 22m
2 stops
Air Canada Logo
12:10 pm - 3:42 pm
STL
-
YUL
2h 32mnonstop
$489Air Canada
Fri, Jul 24 - Sun, Jul 26
United Airlines Logo
9:45 am - 9:21 pm
YUL
-
STL
12h 36m
1 stop
United Airlines Logo
8:00 am - 7:45 pm
STL
-
YUL
10h 45m
2 stops
$490United Airlines
Thu, Oct 1 - Sun, Oct 4
American Airlines Logo
12:30 pm - 12:16 am
YUL
-
STL
12h 46m
1 stop
American Airlines Logo
6:00 am - 4:50 pm
STL
-
YUL
9h 50m
1 stop
$491American Airlines
Tue, Aug 4 - Tue, Aug 11

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American Airlines flights from Montreal to St. Louis

Our best American Airlines deals on Montreal to St. Louis flight tickets
American Airlines
Aug 4
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
12h 46m
1 stop
STL12:16 amLambert-St Louis
Aug 11
STL6:00 amLambert-St Louis
9h 50m
1 stop
YUL4:50 pmMontreal Pierre Elliott Trudeau Intl
$491
American Airlines
Aug 3
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
12h 46m
1 stop
STL12:16 amLambert-St Louis
Aug 10
STL6:00 amLambert-St Louis
14h 44m
1 stop
YUL9:44 pmMontreal Pierre Elliott Trudeau Intl
$519
American Airlines
Aug 3
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
12h 46m
1 stop
STL12:16 amLambert-St Louis
Aug 10
STL6:00 amLambert-St Louis
14h 44m
1 stop
YUL9:44 pmMontreal Pierre Elliott Trudeau Intl
$522

Delta flights from Montreal to St. Louis

Our best Delta deals on Montreal to St. Louis flight tickets
Delta
Oct 27
YUL6:00 amMontreal Pierre Elliott Trudeau Intl
8h 20m
1 stop
STL1:20 pmLambert-St Louis
Oct 28
STL5:45 pmLambert-St Louis
4h 25m
1 stop
YUL11:10 pmMontreal Pierre Elliott Trudeau Intl
$485
Delta
Jul 8
YUL7:00 amMontreal Pierre Elliott Trudeau Intl
9h 13m
1 stop
STL3:13 pmLambert-St Louis
Jul 13
STL3:58 pmLambert-St Louis
6h 54m
1 stop
YUL11:52 pmMontreal Pierre Elliott Trudeau Intl
$507
Delta
Jul 7
YUL6:47 pmMontreal Pierre Elliott Trudeau Intl
6h 06m
1 stop
STL11:53 pmLambert-St Louis
Jul 16
STL1:22 pmLambert-St Louis
9h 30m
1 stop
YUL11:52 pmMontreal Pierre Elliott Trudeau Intl
$542

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 June 23, 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
Quickest round-trip

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 10/15

4:55 pm-6:41 pm

Nonstop2h 46m

Lambert-St Louis

Mon 10/19

12:10 pm-3:41 pm

Nonstop2h 31m

$480

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 10/15

4:55 pm-6:41 pm

Nonstop2h 46m

Lambert-St Louis

Mon 10/19

12:10 pm-3:41 pm

Nonstop2h 31m

$481

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 10/15

4:55 pm-6:41 pm

Nonstop2h 46m

Lambert-St Louis

Mon 10/19

12:10 pm-3:41 pm

Nonstop2h 31m

$484

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 10/27

6:00 am-1:20 pm

1 stop8h 20m

Lambert-St Louis

Wed 10/28

5:45 pm-11:10 pm

1 stop4h 25m

$485

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 10/1

6:00 am-3:43 pm

2 stops10h 43m

Lambert-St Louis

Wed 10/7

8:00 am-7:45 pm

2 stops10h 45m

$486

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 7/9

8:40 am-2:02 pm

2 stops6h 22m

Lambert-St Louis

Sun 7/12

12:10 pm-3:42 pm

Nonstop2h 32m

$487

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 7/24

4:55 pm-6:42 pm

Nonstop2h 47m

Lambert-St Louis

Sun 7/26

12:10 pm-3:42 pm

Nonstop2h 32m

$488

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 7/24

8:40 am-2:02 pm

2 stops6h 22m

Lambert-St Louis

Sun 7/26

12:10 pm-3:42 pm

Nonstop2h 32m

$489

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 10/1

9:45 am-9:21 pm

1 stop12h 36m

Lambert-St Louis

Sun 10/4

8:00 am-7:45 pm

2 stops10h 45m

$490

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 8/4

12:30 pm-12:16 am

1 stop12h 46m

Lambert-St Louis

Tue 8/11

6:00 am-4:50 pm

1 stop9h 50m

$491

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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, June 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 $248. The month of December is another great option to travel to St. Louis, with average flight prices from Montreal averaging around $277.

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 $567. 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 Tuesday because tickets tend to average around $1,065. 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 are 3 cabin classes 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?

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

Fastest flight time

2h 46m

Direct flights

Every day

Airports in St. Louis

1 airport
The fastest flight from Montreal to St. Louis takes 2h 46m
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 46m 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
11,244 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
Fairview Heights
Hermann
Maryland Heights
Florissant
O'Fallon
Collinsville
St. Peters
Alton
Wentzville
Farmington
Fenton
Clayton
Festus
Eureka
Litchfield
Edwardsville
Grafton
Shrewsbury

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

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