Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Montreal to St. Louis from $198

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 4/29. 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
12:30 pm - 11:46 pm
YUL
-
STL
12h 16m
1 stop
American Airlines Logo
5:21 pm - 11:44 am
STL
-
YUL
17h 23m
1 stop
$349American Airlines
Mon, Apr 20 - Sat, Apr 25
American Airlines Logo
12:30 pm - 11:46 pm
YUL
-
STL
12h 16m
1 stop
American Airlines Logo
8:03 pm - 11:44 am
STL
-
YUL
14h 41m
1 stop
$350American Airlines
Mon, Apr 20 - Sat, Apr 25
Air Canada Logo
8:50 am - 3:29 pm
YUL
-
STL
7h 39m
2 stops
Air Canada Logo
4:05 pm - 11:32 pm
STL
-
YUL
6h 27m
1 stop
$448Air Canada
Fri, Mar 13 - Sun, Mar 15
Air Canada Logo
9:10 am - 3:29 pm
YUL
-
STL
7h 19m
1 stop
Air Canada Logo
4:05 pm - 11:32 pm
STL
-
YUL
6h 27m
1 stop
$456Air Canada
Fri, Mar 13 - Sun, Mar 15
Delta Logo
7:00 am - 2:24 pm
YUL
-
STL
8h 24m
1 stop
Delta Logo
12:28 pm - 11:40 pm
STL
-
YUL
10h 12m
1 stop
$473Delta
Mon, Mar 16 - Mon, Mar 23
Air Canada Logo
10:10 am - 3:29 pm
YUL
-
STL
6h 19m
1 stop
Air Canada Logo
4:05 pm - 9:51 pm
STL
-
YUL
4h 46m
1 stop
$484Air Canada
Thu, Mar 26 - Mon, Mar 30
Multiple Airlines Logo
7:33 pm - 6:51 am
YUL
-
STL
36h 18m
2 stops
Multiple Airlines Logo
3:49 pm - 12:30 am
STL
-
YUL
7h 41m
1 stop
$516Multiple Airlines
Thu, Feb 26 - Tue, Mar 3
WestJet Logo
12:42 pm - 9:05 am
YUL
-
STL
21h 23m
1 stop
WestJet Logo
12:04 pm - 12:38 am
STL
-
YUL
11h 34m
2 stops
$518WestJet
Thu, Mar 26 - Mon, Mar 30
Multiple Airlines Logo
7:33 pm - 6:51 am
YUL
-
STL
36h 18m
2 stops
Multiple Airlines Logo
3:49 pm - 12:30 am
STL
-
YUL
7h 41m
1 stop
$520Multiple Airlines
Thu, Feb 26 - Tue, Mar 3
United Airlines Logo
1:10 pm - 9:15 pm
YUL
-
STL
9h 05m
1 stop
United Airlines Logo
11:15 am - 12:13 am
STL
-
YUL
11h 58m
2 stops
$533United Airlines
Thu, Mar 26 - Mon, Mar 30

Delta flights from Montreal to St. Louis

Our best Delta deals on Montreal to St. Louis flight tickets
Delta
Mar 16
YUL7:00 amMontreal Pierre Elliott Trudeau Intl
8h 24m
1 stop
STL2:24 pmLambert-St Louis
Mar 23
STL12:28 pmLambert-St Louis
10h 12m
1 stop
YUL11:40 pmMontreal Pierre Elliott Trudeau Intl
$473
Delta
Mar 2
YUL6:00 pmMontreal Pierre Elliott Trudeau Intl
6h 36m
1 stop
STL11:36 pmLambert-St Louis
Mar 5
STL6:35 amLambert-St Louis
4h 24m
1 stop
YUL11:59 amMontreal Pierre Elliott Trudeau Intl
$536
Delta
Mar 5
YUL7:33 pmMontreal Pierre Elliott Trudeau Intl
14h 24m
1 stop
STL8:57 amLambert-St Louis
Mar 8
STL6:10 amLambert-St Louis
25h 20m
1 stop
YUL8:30 amMontreal Pierre Elliott Trudeau Intl
$543

WestJet flights from Montreal to St. Louis

Our best WestJet deals on Montreal to St. Louis flight tickets
WestJet
Mar 26
YUL12:42 pmMontreal Pierre Elliott Trudeau Intl
21h 23m
1 stop
STL9:05 amLambert-St Louis
Mar 30
STL12:04 pmLambert-St Louis
11h 34m
2 stops
YUL12:38 amMontreal Pierre Elliott Trudeau Intl
$518
WestJet
Mar 2
YUL7:30 pmMontreal Pierre Elliott Trudeau Intl
25h 09m
2 stops
STL7:39 pmLambert-St Louis
Mar 5
STL6:35 amLambert-St Louis
4h 24m
1 stop
YUL11:59 amMontreal Pierre Elliott Trudeau Intl
$562
WestJet
Mar 2
YUL7:30 pmMontreal Pierre Elliott Trudeau Intl
20h 17m
2 stops
STL2:47 pmLambert-St Louis
Mar 5
STL6:30 amLambert-St Louis
17h 08m
2 stops
YUL12:38 amMontreal Pierre Elliott Trudeau Intl
$571

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 February 6, 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

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 4/20

12:30 pm-11:46 pm

1 stop12h 16m

Lambert-St Louis

Sat 4/25

5:21 pm-11:44 am

1 stop17h 23m

$349

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 4/20

12:30 pm-11:46 pm

1 stop12h 16m

Lambert-St Louis

Sat 4/25

8:03 pm-11:44 am

1 stop14h 41m

$350

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 3/13

8:50 am-3:29 pm

2 stops7h 39m

Lambert-St Louis

Sun 3/15

4:05 pm-11:32 pm

1 stop6h 27m

$448

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 3/13

9:10 am-3:29 pm

1 stop7h 19m

Lambert-St Louis

Sun 3/15

4:05 pm-11:32 pm

1 stop6h 27m

$456

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 3/16

7:00 am-2:24 pm

1 stop8h 24m

Lambert-St Louis

Mon 3/23

12:28 pm-11:40 pm

1 stop10h 12m

$473

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 3/26

10:10 am-3:29 pm

1 stop6h 19m

Lambert-St Louis

Mon 3/30

4:05 pm-9:51 pm

1 stop4h 46m

$484

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 2/26

7:33 pm-6:51 am

2 stops36h 18m

Lambert-St Louis

Tue 3/3

3:49 pm-12:30 am

1 stop7h 41m

$516

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 3/26

12:42 pm-9:05 am

1 stop21h 23m

Lambert-St Louis

Mon 3/30

12:04 pm-12:38 am

2 stops11h 34m

$518

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 2/26

7:33 pm-6:51 am

2 stops36h 18m

Lambert-St Louis

Tue 3/3

3:49 pm-12:30 am

1 stop7h 41m

$520

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 3/26

1:10 pm-9:15 pm

1 stop9h 05m

Lambert-St Louis

Mon 3/30

11:15 am-12:13 am

2 stops11h 58m

$533

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, July 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 $286. The month of September is another great option to travel to St. Louis, with average flight prices from Montreal averaging around $421.

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 Friday when prices can be found for as low as $246. 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 Thursday because tickets tend to average around $609. 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 Lambert-St Louis flights?

There are 3 cabin classes available to choose from on Montreal to Lambert-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.

How have Montreal to St. Louis flight prices changed over time?

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 47m

Direct flights

Mon

Airports in St. Louis

1 airport
The fastest flight from Montreal to St. Louis takes 2h 47m
Direct flights go from Montreal to St. Louis on Monday. There are no airlines offering direct flights.
There is 1 airport in St. Louis. From Montreal there are direct flights to Lambert-St Louis (STL).
Search flight deals

  • 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 $435Free CancellationRating
7.1
10,694 reviews
Search Air Canada flights
DeltaPriceFrom $452Free CancellationRating
7.9
8,153 reviews
Search Delta 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
Hermann
Fairview Heights
Maryland Heights
Florissant
O'Fallon
Collinsville
St. Peters
Fenton
Wentzville
Alton
Farmington
Clayton
Edwardsville
Eureka
Festus
Litchfield
Glencoe
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

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
Sun 3/8
Sun 3/15
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States