Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from $176

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 Pierre Elliott Trudeau Intl Airport to St. Louis departing on 1/29. 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 Pierre Elliott Trudeau Intl Airport to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
4:35 pm - 9:21 am
YUL
-
STL
17h 46m1 stop
Multiple Airlines Logo
5:42 pm - 5:00 pm
STL
-
YUL
22h 18m2 stops
$295Multiple Airlines
Sun, Jan 25 - Tue, Feb 3
Multiple Airlines Logo
4:35 pm - 12:27 am
YUL
-
STL
8h 52m1 stop
Multiple Airlines Logo
3:49 pm - 5:00 pm
STL
-
YUL
24h 11m2 stops
$316Multiple Airlines
Fri, Feb 20 - Mon, Feb 23
Multiple Airlines Logo
4:35 pm - 12:27 am
YUL
-
STL
8h 52m1 stop
Multiple Airlines Logo
3:49 pm - 12:30 am
STL
-
YUL
7h 41m1 stop
$353Multiple Airlines
Fri, Feb 20 - Mon, Feb 23
American Airlines Logo
2:25 pm - 10:20 am
YUL
-
STL
20h 55m2 stops
American Airlines Logo
1:35 pm - 3:08 pm
STL
-
YUL
24h 33m1 stop
$453American Airlines
Fri, Feb 6 - Mon, Feb 9
American Airlines Logo
3:55 pm - 9:34 am
YUL
-
STL
18h 39m1 stop
American Airlines Logo
6:33 pm - 3:10 pm
STL
-
YUL
19h 37m1 stop
$462American Airlines
Fri, Feb 20 - Mon, Feb 23
American Airlines Logo
7:00 am - 3:04 pm
YUL
-
STL
9h 04m1 stop
American Airlines Logo
6:00 am - 3:08 pm
STL
-
YUL
8h 08m1 stop
$494American Airlines
Sun, Jan 25 - Tue, Feb 3
Delta Logo
7:30 pm - 12:36 pm
YUL
-
STL
18h 06m1 stop
Delta Logo
5:56 pm - 11:12 pm
STL
-
YUL
4h 16m1 stop
$507Delta
Fri, Jan 30 - Mon, Feb 2
Delta Logo
7:00 am - 4:07 pm
YUL
-
STL
10h 07m1 stop
Delta Logo
7:25 am - 1:31 pm
STL
-
YUL
5h 06m1 stop
$518Delta
Wed, Jan 28 - Sat, Jan 31
American Airlines Logo
3:55 pm - 9:34 am
YUL
-
STL
18h 39m1 stop
American Airlines Logo
10:04 am - 10:44 pm
STL
-
YUL
11h 40m2 stops
$529American Airlines
Fri, Feb 20 - Mon, Feb 23
Delta Logo
9:34 am - 8:37 pm
YUL
-
STL
12h 03m2 stops
Delta Logo
6:10 am - 1:42 pm
STL
-
YUL
6h 32m1 stop
$533Delta
Wed, Jan 28 - Sat, Jan 31

Delta flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Our best Delta deals on Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flight tickets
Delta
Jan 30
YUL7:30 pmMontreal Pierre Elliott Trudeau Intl
18h 06m
1 stop
STL12:36 pmLambert-St Louis
Feb 2
STL5:56 pmLambert-St Louis
4h 16m
1 stop
YUL11:12 pmMontreal Pierre Elliott Trudeau Intl
$507
Find similar
Delta
Jan 28
YUL7:00 amMontreal Pierre Elliott Trudeau Intl
10h 07m
1 stop
STL4:07 pmLambert-St Louis
Jan 31
STL7:25 amLambert-St Louis
5h 06m
1 stop
YUL1:31 pmMontreal Pierre Elliott Trudeau Intl
$518
Find similar
Delta
Jan 28
YUL9:34 amMontreal Pierre Elliott Trudeau Intl
12h 03m
2 stops
STL8:37 pmLambert-St Louis
Jan 31
STL6:10 amLambert-St Louis
6h 32m
1 stop
YUL1:42 pmMontreal Pierre Elliott Trudeau Intl
$533
Find similar

WestJet flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Our best WestJet deals on Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flight tickets
WestJet
May 31
YUL7:00 amMontreal Pierre Elliott Trudeau Intl
9h 58m
1 stop
STL3:58 pmLambert-St Louis
Jun 7
STL9:00 amLambert-St Louis
20h 57m
2 stops
YUL6:57 amMontreal Pierre Elliott Trudeau Intl
$671
Find similar
WestJet
Dec 26
YUL7:30 pmMontreal Pierre Elliott Trudeau Intl
40h 42m
2 stops
STL11:12 amLambert-St Louis
Jan 2
STL6:05 amLambert-St Louis
17h 38m
2 stops
YUL12:43 amMontreal Pierre Elliott Trudeau Intl
$1,013
Find similar
WestJet
Dec 26
YUL6:45 amMontreal Pierre Elliott Trudeau Intl
11h 16m
2 stops
STL5:01 pmLambert-St Louis
Jan 2
STL5:59 pmLambert-St Louis
29h 44m
2 stops
YUL12:43 amMontreal Pierre Elliott Trudeau Intl
$1,024
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Montreal Pierre Elliott Trudeau Intl Airport 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 December 15, 2025.
Use the filters below to find and compare flights from Montreal Pierre Elliott Trudeau Intl Airport 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

Sun 1/25

4:35 pm-9:21 am

1 stop17h 46m

Lambert-St Louis

Tue 2/3

5:42 pm-5:00 pm

2 stops22h 18m

$295

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 2/20

4:35 pm-12:27 am

1 stop8h 52m

Lambert-St Louis

Mon 2/23

3:49 pm-5:00 pm

2 stops24h 11m

$316

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 2/20

4:35 pm-12:27 am

1 stop8h 52m

Lambert-St Louis

Mon 2/23

3:49 pm-12:30 am

1 stop7h 41m

$353

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 2/6

2:25 pm-10:20 am

2 stops20h 55m

Lambert-St Louis

Mon 2/9

1:35 pm-3:08 pm

1 stop24h 33m

$453

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 2/20

3:55 pm-9:34 am

1 stop18h 39m

Lambert-St Louis

Mon 2/23

6:33 pm-3:10 pm

1 stop19h 37m

$462

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Sun 1/25

7:00 am-3:04 pm

1 stop9h 04m

Lambert-St Louis

Tue 2/3

6:00 am-3:08 pm

1 stop8h 08m

$494

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 1/30

7:30 pm-12:36 pm

1 stop18h 06m

Lambert-St Louis

Mon 2/2

5:56 pm-11:12 pm

1 stop4h 16m

$507

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 1/28

7:00 am-4:07 pm

1 stop10h 07m

Lambert-St Louis

Sat 1/31

7:25 am-1:31 pm

1 stop5h 06m

$518

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 2/20

3:55 pm-9:34 am

1 stop18h 39m

Lambert-St Louis

Mon 2/23

10:04 am-10:44 pm

2 stops11h 40m

$529

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 1/28

9:34 am-8:37 pm

2 stops12h 03m

Lambert-St Louis

Sat 1/31

6:10 am-1:42 pm

1 stop6h 32m

$533

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
1
2

See travel insights to St. Louis from

How to get the cheapest flight ticket from Montreal Pierre Elliott Trudeau Intl Airport 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 cheapest month to fly to St. Louis?

In general, May is the cheapest month to fly from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $448. The month of April is another great option to travel to St. Louis, with average flight prices from Montreal Pierre Elliott Trudeau Intl Airport averaging around $485.

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

Flying to St. Louis from Montreal Pierre Elliott Trudeau Intl Airport in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $435 when looking at flights departing in the afternoon. 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 Pierre Elliott Trudeau Intl to Lambert-St Louis flight route?

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

What cabin class options are available on Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis flights?

There are 3 cabin classes available to choose from on Montreal Pierre Elliott Trudeau Intl 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 Pierre Elliott Trudeau Intl Airport to St. Louis flights?

You could potentially save up to 13% on your flight if you consider stops on a Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flight.

When to book flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

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

Cheap Montreal Pierre Elliott Trudeau Intl Airport to St. Louis (YUL to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Fastest flight time

2h 55m

Direct flights

Mon

Airports in St. Louis

1 airport
The fastest flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis takes 2h 55m
Direct flights go from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis on Monday. There are no airlines offering direct flights.
There is 1 airport in St. Louis. From Montreal Pierre Elliott Trudeau Intl Airport there are direct flights to Lambert-St Louis (STL).
Search flight deals

  • How far is Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis by plane?

    A flight from Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis will travel around 963.7 mi. Flights usually cover this in 2h 55m, depending on flying conditions and air traffic around both airports.

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

    Prices for flights from Montreal Pierre Elliott Trudeau Intl Airport to Lambert-St Louis Airport are refreshed on a daily basis.

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Montreal Pierre Elliott Trudeau Intl Airport to Lambert-St Louis Airport.

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

    The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

  • What is the most popular airline from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

Best airlines flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

Compare and see reviews for airlines that fly from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom $435Free CancellationRating
7.1
10,527 reviews
Search Air Canada flights
DeltaPriceFrom $452Free CancellationRating
7.9
8,008 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
O'Fallon
Florissant
Fenton
Wentzville
St. Peters
Collinsville
Alton
Clayton
Festus
Glencoe
Farmington
Eureka
Edwardsville
Litchfield
Shrewsbury

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to St. Louis from Montreal.

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

momondo does allow users to show only those flights to St. Louis from Montreal which offer a flexible booking policy as well as other useful filters and features.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Montreal to St. Louis.

I’m not ready to book a flight from Montreal to St. Louis right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to St. Louis from Montreal. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices 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
Wed 1/14
Wed 1/21
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States