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Cheap flights from Montreal to St. Louis from $193

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 9/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Montreal to St. Louis

Cheap round-trip flights

American Airlines Logo
12:31 pm - 9:53 pmYUL-STL
10h 22m1 stop
American Airlines Logo
2:01 pm - 11:46 amSTL-YUL
20h 45m1 stop
$326American Airlines
Find Deal
sáb., sep. 13 - sáb., sep. 20
American Airlines Logo
10:34 am - 9:53 pmYUL-STL
12h 19m2 stops
American Airlines Logo
5:25 pm - 11:46 amSTL-YUL
17h 21m1 stop
$335American Airlines
Find Deal
sáb., sep. 13 - sáb., sep. 20
Delta Logo
6:00 am - 8:06 amYUL-STL
27h 06m1 stop
Delta Logo
6:40 am - 12:00 pmSTL-YUL
4h 20m1 stop
$408Delta
Find Deal
lun., sep. 8 - mar., sep. 16
Air Canada Logo
6:10 pm - 7:57 pmYUL-STL
2h 47mnonstop
Air Canada Logo
9:15 am - 4:20 pmSTL-YUL
6h 05m1 stop
$427Air Canada
Find Deal
lun., sep. 8 - mar., sep. 16
United Airlines Logo
6:15 am - 3:44 pmYUL-STL
10h 29m1 stop
United Airlines Logo
7:04 pm - 10:40 amSTL-YUL
14h 36m1 stop
$445United Airlines
Find Deal
mié., ago. 27 - mié., sep. 3
Delta Logo
7:00 am - 3:25 pmYUL-STL
9h 25m1 stop
Delta Logo
5:28 pm - 10:06 amSTL-YUL
15h 38m1 stop
$472Delta
Find Deal
jue., sep. 25 - lun., sep. 29
United Airlines Logo
6:15 am - 3:44 pmYUL-STL
10h 29m1 stop
United Airlines Logo
6:35 am - 9:29 pmSTL-YUL
13h 54m1 stop
$475United Airlines
Find Deal
jue., ago. 21 - mié., sep. 3
Logo
7:00 am - 4:35 pmYUL-STL
10h 35m3 stops
Logo
1:00 pm - 3:20 pmSTL-YUL
25h 20m3 stops
$481
Find Deal
vie., sep. 12 - vie., sep. 19
Logo
6:45 am - 9:40 amYUL-STL
27h 55m2 stops
Logo
5:40 pm - 2:20 pmSTL-YUL
19h 40m1 stop
$482
Find Deal
mié., ago. 13 - dom., ago. 17
Air Canada Logo
6:10 pm - 7:57 pmYUL-STL
2h 47mnonstop
Air Canada Logo
1:30 pm - 5:00 pmSTL-YUL
2h 30mnonstop
$495Air Canada
Find Deal
lun., sep. 8 - mar., sep. 16

Air Canada flights from Montreal to St. Louis

Our best Air Canada deals on Montreal to St. Louis flight tickets
Air Canada
Sep 8
YUL6:10 pmMontreal Pierre Elliott Trudeau Intl
2h 47m
STL7:57 pmLambert-St Louis
Sep 16
STL9:15 amLambert-St Louis
6h 05m
1 stop
YUL4:20 pmMontreal Pierre Elliott Trudeau Intl
$427
Find similar
Air Canada
Sep 8
YUL6:10 pmMontreal Pierre Elliott Trudeau Intl
2h 47m
STL7:57 pmLambert-St Louis
Sep 16
STL1:30 pmLambert-St Louis
2h 30m
YUL5:00 pmMontreal Pierre Elliott Trudeau Intl
$495
Find similar
Air Canada
Sep 25
YUL6:10 pmMontreal Pierre Elliott Trudeau Intl
2h 47m
STL7:57 pmLambert-St Louis
Sep 29
STL1:30 pmLambert-St Louis
2h 30m
YUL5:00 pmMontreal Pierre Elliott Trudeau Intl
$519
Find similar

American Airlines flights from Montreal to St. Louis

Our best American Airlines deals on Montreal to St. Louis flight tickets
American Airlines
Sep 13
YUL12:31 pmMontreal Pierre Elliott Trudeau Intl
10h 22m
1 stop
STL9:53 pmLambert-St Louis
Sep 20
STL2:01 pmLambert-St Louis
20h 45m
1 stop
YUL11:46 amMontreal Pierre Elliott Trudeau Intl
$326
Find similar
American Airlines
Sep 13
YUL10:34 amMontreal Pierre Elliott Trudeau Intl
12h 19m
2 stops
STL9:53 pmLambert-St Louis
Sep 20
STL5:25 pmLambert-St Louis
17h 21m
1 stop
YUL11:46 amMontreal Pierre Elliott Trudeau Intl
$335
Find similar
American Airlines
Sep 26
YUL5:15 pmMontreal Pierre Elliott Trudeau Intl
17h 11m
1 stop
STL9:26 amLambert-St Louis
Sep 29
STL7:23 amLambert-St Louis
8h 10m
1 stop
YUL4:33 pmMontreal Pierre Elliott Trudeau Intl
$365
Find similar

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 julio 31, 2025.
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

sáb. 9/13

12:31 pm-9:53 pm

1 stop10h 22m

Lambert-St Louis

sáb. 9/20

2:01 pm-11:46 am

1 stop20h 45m

$326

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

sáb. 9/13

10:34 am-9:53 pm

2 stops12h 19m

Lambert-St Louis

sáb. 9/20

5:25 pm-11:46 am

1 stop17h 21m

$335

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

lun. 9/8

6:00 am-8:06 am

1 stop27h 06m

Lambert-St Louis

mar. 9/16

6:40 am-12:00 pm

1 stop4h 20m

$408

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

lun. 9/8

6:10 pm-7:57 pm

Nonstop2h 47m

Lambert-St Louis

mar. 9/16

9:15 am-4:20 pm

1 stop6h 05m

$427

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

mié. 8/27

6:15 am-3:44 pm

1 stop10h 29m

Lambert-St Louis

mié. 9/3

7:04 pm-10:40 am

1 stop14h 36m

$445

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

jue. 9/25

7:00 am-3:25 pm

1 stop9h 25m

Lambert-St Louis

lun. 9/29

5:28 pm-10:06 am

1 stop15h 38m

$472

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

jue. 8/21

6:15 am-3:44 pm

1 stop10h 29m

Lambert-St Louis

mié. 9/3

6:35 am-9:29 pm

1 stop13h 54m

$475

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

vie. 9/12

7:00 am-4:35 pm

3 stops10h 35m

Lambert-St Louis

vie. 9/19

1:00 pm-3:20 pm

3 stops25h 20m

$481

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

mié. 8/13

6:45 am-9:40 am

2 stops27h 55m

Lambert-St Louis

dom. 8/17

5:40 pm-2:20 pm

1 stop19h 40m

$482

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

lun. 9/8

6:10 pm-7:57 pm

Nonstop2h 47m

Lambert-St Louis

mar. 9/16

1:30 pm-5:00 pm

Nonstop2h 30m

$495

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, 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 August is another great option to travel to St. Louis, with average flight prices from Montreal averaging around $451.

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 $256. 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 time of day to depart on your flight to St. Louis?

Flying to St. Louis from Montreal in the evening is the least expensive time of day to depart. momondo users have found prices as low as $282 when looking at flights departing in the evening. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $593 per ticket.

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?

You could potentially save up to 9% 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

$193

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 $193. The best round-trip flight deal from Montreal to St. Louis found on momondo in the last 72 hours is $326.
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 near St. Louis: 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?

  • What is the most popular airline 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 $433Free CancellationRating
7.1
9,851 reviews
Search Air Canada flights
DeltaPriceFrom $452Free CancellationRating
8.0
7,981 reviews
Search Delta 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 $433. Generally, Air Canada has 4 flights on this route every week with an average price of $542. 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
Florissant
Fenton
Collinsville
O'Fallon
Alton
St. Peters
Farmington
Wentzville
Festus
Glencoe
Eureka
Edwardsville
Clayton
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.

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