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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from $241

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 8/25. 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 Pierre Elliott Trudeau Intl Airport 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 - 6:42 pm
YUL
-
STL
2h 47mnonstop
Air Canada Logo
12:10 pm - 3:42 pm
STL
-
YUL
2h 32mnonstop
$482Air Canada
Fri, Jul 24 - Sun, Jul 26
American Airlines Logo
12:30 pm - 12:14 am
YUL
-
STL
12h 44m
1 stop
American Airlines Logo
7:21 am - 4:53 pm
STL
-
YUL
8h 32m
1 stop
$483American Airlines
Wed, Sep 2 - Mon, Sep 28
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
Delta Logo
7:00 am - 12:56 pm
YUL
-
STL
6h 56m
1 stop
Delta Logo
7:20 am - 5:03 pm
STL
-
YUL
8h 43m
1 stop
$486Delta
Thu, Oct 15 - Mon, Oct 19
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
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
$490Air Canada
Fri, Jul 17 - Sun, Jul 19
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
Delta Logo
7:00 am - 12:56 pm
YUL
-
STL
6h 56m
1 stop
Delta Logo
7:20 am - 5:03 pm
STL
-
YUL
8h 43m
1 stop
$492Delta
Thu, Oct 15 - Mon, Oct 19

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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
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
Oct 15
YUL7:00 amMontreal Pierre Elliott Trudeau Intl
6h 56m
1 stop
STL12:56 pmLambert-St Louis
Oct 19
STL7:20 amLambert-St Louis
8h 43m
1 stop
YUL5:03 pmMontreal Pierre Elliott Trudeau Intl
$492
Delta
Sep 24
YUL7:00 amMontreal Pierre Elliott Trudeau Intl
9h 54m
1 stop
STL3:54 pmLambert-St Louis
Sep 28
STL5:59 pmLambert-St Louis
4h 28m
1 stop
YUL11:27 pmMontreal Pierre Elliott Trudeau Intl
$493

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

Our best American Airlines deals on Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flight tickets
American Airlines
Sep 2
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
12h 44m
1 stop
STL12:14 amLambert-St Louis
Sep 28
STL7:21 amLambert-St Louis
8h 32m
1 stop
YUL4:53 pmMontreal Pierre Elliott Trudeau Intl
$483
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
YUL7:51 amMontreal Pierre Elliott Trudeau Intl
16h 41m
1 stop
STL11:32 pmLambert-St Louis
Aug 10
STL8:07 pmLambert-St Louis
14h 36m
1 stop
YUL11:43 amMontreal Pierre Elliott Trudeau Intl
$523

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 June 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
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

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

$482

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 9/2

12:30 pm-12:14 am

1 stop12h 44m

Lambert-St Louis

Mon 9/28

7:21 am-4:53 pm

1 stop8h 32m

$483

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 10/15

7:00 am-12:56 pm

1 stop6h 56m

Lambert-St Louis

Mon 10/19

7:20 am-5:03 pm

1 stop8h 43m

$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

Thu 7/9

4:55 pm-6:42 pm

Nonstop2h 47m

Lambert-St Louis

Sun 7/12

12:10 pm-3:42 pm

Nonstop2h 32m

$488

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 7/17

4:55 pm-6:42 pm

Nonstop2h 47m

Lambert-St Louis

Sun 7/19

12:10 pm-3:42 pm

Nonstop2h 32m

$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

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 10/15

7:00 am-12:56 pm

1 stop6h 56m

Lambert-St Louis

Mon 10/19

7:20 am-5:03 pm

1 stop8h 43m

$492

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, November 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 $542. The month of October is another great option to travel to St. Louis, with average flight prices from Montreal Pierre Elliott Trudeau Intl Airport averaging around $547.

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 $498. 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 Friday because tickets tend to average around $690. 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 Airport to St. Louis flights?

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

No. A direct flight is the cheapest option for a flight between Montreal Pierre Elliott Trudeau Intl Airport to St. Louis.

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

$371

Fastest flight time

2h 46m

Direct flights

Mon, Tue, Wed, Thu, Fri and Sat

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Montreal Pierre Elliott Trudeau Intl Airport in the past 72 hours is $371. The best round-trip flight deal from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis found on momondo in the last 72 hours is $498.
The fastest flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis takes 2h 46m
Direct flights go from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis on Monday, Tuesday, Wednesday, Thursday, Friday and Saturday. Airlines offering direct flights are: United Airlines and Air Canada.
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

Frequently asked questions about flying from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

  • 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 46m, 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
11,268 reviews
Search Air Canada flights

  • Air Canada Flights From Montreal Pierre Elliott Trudeau Intl Airport to St. Louis

    Air Canada flight deals from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis start from $499 round-trip. Over the 4 Air Canada flights for this route in a normal week, average airfare is usually $589 round-trip - but some users have found much cheaper deals with momondo.

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?

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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