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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from $231

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 4/26. 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

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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.
Delta Logo
7:41 pm - 12:05 pm
YUL
-
STL
17h 24m
1 stop
Delta Logo
6:05 am - 6:51 pm
STL
-
YUL
11h 46m
1 stop
$447Delta
Fri, May 1 - Tue, May 5
Delta Logo
7:41 pm - 12:05 pm
YUL
-
STL
17h 24m
1 stop
Delta Logo
5:27 pm - 8:40 am
STL
-
YUL
14h 13m
1 stop
$448Delta
Fri, May 1 - Tue, May 5
Delta Logo
7:41 pm - 12:05 pm
YUL
-
STL
17h 24m
1 stop
Delta Logo
6:05 am - 6:51 pm
STL
-
YUL
11h 46m
1 stop
$449Delta
Fri, May 1 - Tue, May 5
Delta Logo
7:41 pm - 6:23 pm
YUL
-
STL
23h 42m
1 stop
Delta Logo
6:05 am - 6:51 pm
STL
-
YUL
11h 46m
1 stop
$450Delta
Fri, May 1 - Tue, May 5
Delta Logo
6:00 am - 9:42 am
YUL
-
STL
4h 42m
1 stop
Delta Logo
9:59 am - 5:40 pm
STL
-
YUL
6h 41m
1 stop
$457Delta
Mon, Apr 20 - Tue, Apr 28
Delta Logo
6:00 am - 9:42 am
YUL
-
STL
4h 42m
1 stop
Delta Logo
5:59 pm - 11:08 pm
STL
-
YUL
4h 09m
1 stop
$458Delta
Mon, Apr 20 - Tue, Apr 28
Delta Logo
6:45 pm - 11:36 pm
YUL
-
STL
5h 51m
1 stop
Delta Logo
5:35 pm - 11:26 pm
STL
-
YUL
4h 51m
1 stop
$459Delta
Mon, Apr 20 - Tue, Apr 28
Delta Logo
6:45 pm - 11:36 pm
YUL
-
STL
5h 51m
1 stop
Delta Logo
6:04 pm - 8:39 am
STL
-
YUL
13h 35m
2 stops
$483Delta
Fri, Apr 24 - Sat, May 30
Delta Logo
12:42 pm - 9:19 pm
YUL
-
STL
9h 37m
1 stop
Delta Logo
6:48 am - 11:59 am
STL
-
YUL
4h 11m
1 stop
$493Delta
Fri, Apr 24 - Fri, May 1
Delta Logo
7:44 pm - 9:29 am
YUL
-
STL
14h 45m
2 stops
Delta Logo
5:24 pm - 11:59 pm
STL
-
YUL
5h 35m
1 stop
$495Delta
Fri, Jun 5 - Sun, Jun 7

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 10
YUL7:00 amMontreal Pierre Elliott Trudeau Intl
6h 20m
1 stop
STL12:20 pmLambert-St Louis
May 16
STL6:04 pmLambert-St Louis
4h 09m
1 stop
YUL11:13 pmMontreal Pierre Elliott Trudeau Intl
$530
WestJet
Apr 24
YUL7:00 amMontreal Pierre Elliott Trudeau Intl
11h 44m
1 stop
STL5:44 pmLambert-St Louis
May 1
STL6:05 amLambert-St Louis
11h 15m
2 stops
YUL6:20 pmMontreal Pierre Elliott Trudeau Intl
$546
WestJet
May 7
YUL7:44 pmMontreal Pierre Elliott Trudeau Intl
17h 39m
1 stop
STL12:23 pmLambert-St Louis
May 14
STL6:21 amLambert-St Louis
16h 20m
1 stop
YUL11:41 pmMontreal Pierre Elliott Trudeau Intl
$586

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
May 1
YUL7:41 pmMontreal Pierre Elliott Trudeau Intl
17h 24m
1 stop
STL12:05 pmLambert-St Louis
May 5
STL6:05 amLambert-St Louis
11h 46m
1 stop
YUL6:51 pmMontreal Pierre Elliott Trudeau Intl
$447
Delta
May 1
YUL7:41 pmMontreal Pierre Elliott Trudeau Intl
17h 24m
1 stop
STL12:05 pmLambert-St Louis
May 5
STL5:27 pmLambert-St Louis
14h 13m
1 stop
YUL8:40 amMontreal Pierre Elliott Trudeau Intl
$448
Delta
May 1
YUL7:41 pmMontreal Pierre Elliott Trudeau Intl
17h 24m
1 stop
STL12:05 pmLambert-St Louis
May 5
STL6:05 amLambert-St Louis
11h 46m
1 stop
YUL6:51 pmMontreal Pierre Elliott Trudeau Intl
$449

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 March 27, 2026.
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

Cheapest round-trip

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 5/1

7:41 pm-12:05 pm

1 stop17h 24m

Lambert-St Louis

Tue 5/5

6:05 am-6:51 pm

1 stop11h 46m

$447

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 5/1

7:41 pm-12:05 pm

1 stop17h 24m

Lambert-St Louis

Tue 5/5

5:27 pm-8:40 am

1 stop14h 13m

$448

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 5/1

7:41 pm-12:05 pm

1 stop17h 24m

Lambert-St Louis

Tue 5/5

6:05 am-6:51 pm

1 stop11h 46m

$449

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 5/1

7:41 pm-6:23 pm

1 stop23h 42m

Lambert-St Louis

Tue 5/5

6:05 am-6:51 pm

1 stop11h 46m

$450

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 4/20

6:00 am-9:42 am

1 stop4h 42m

Lambert-St Louis

Tue 4/28

9:59 am-5:40 pm

1 stop6h 41m

$457
Quickest round-trip

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 4/20

6:00 am-9:42 am

1 stop4h 42m

Lambert-St Louis

Tue 4/28

5:59 pm-11:08 pm

1 stop4h 09m

$458

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 4/20

6:45 pm-11:36 pm

1 stop5h 51m

Lambert-St Louis

Tue 4/28

5:35 pm-11:26 pm

1 stop4h 51m

$459

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 4/24

6:45 pm-11:36 pm

1 stop5h 51m

Lambert-St Louis

Sat 5/30

6:04 pm-8:39 am

2 stops13h 35m

$483

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 4/24

12:42 pm-9:19 pm

1 stop9h 37m

Lambert-St Louis

Fri 5/1

6:48 am-11:59 am

1 stop4h 11m

$493

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 6/5

7:44 pm-9:29 am

2 stops14h 45m

Lambert-St Louis

Sun 6/7

5:24 pm-11:59 pm

1 stop5h 35m

$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 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 typical price of a round-trip flight between Montreal Pierre Elliott Trudeau Intl Airport and St. Louis?

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

In general, April 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 $485. The month of May is another great option to travel to St. Louis, with average flight prices from Montreal Pierre Elliott Trudeau Intl Airport averaging around $508.

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 Thursday because tickets tend to average around $567. 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 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 2 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 10% 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

Best Price Found

$508

Fastest flight time

2h 47m

Direct flights

Every day

Airports in St. Louis

1 airport
The best flight deal from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis found on momondo in the last 72 hours is $508
The fastest flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis takes 2h 47m
Direct flights go from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis every day.
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 47m, 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 $499Free CancellationRating
7.1
10,843 reviews
Search Air Canada 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
Florissant
Maryland Heights
O'Fallon
Collinsville
St. Peters
Wentzville
Alton
Fenton
Farmington
Clayton
Festus
Edwardsville
Eureka
Litchfield
Shrewsbury
Grafton

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.

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