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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis from $216

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 2/28. 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 Pierre Elliott Trudeau Intl Airport 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
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
$352American 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
5:46 am - 11:44 am
STL
-
YUL
4h 58m
1 stop
$419American 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
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
$451Air Canada
Thu, Mar 12 - Mon, Mar 16
Air Canada Logo
11:10 am - 3:29 pm
YUL
-
STL
5h 19m
1 stop
Air Canada Logo
4:05 pm - 11:32 pm
STL
-
YUL
6h 27m
1 stop
$455Air Canada
Thu, Mar 12 - Mon, Mar 16
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
American Airlines Logo
3:45 pm - 11:44 pm
YUL
-
STL
8h 59m
1 stop
American Airlines Logo
7:05 am - 1:45 pm
STL
-
YUL
5h 40m
1 stop
$458American Airlines
Wed, Mar 11 - Wed, Mar 18
American Airlines Logo
12:59 pm - 11:44 pm
YUL
-
STL
11h 45m
2 stops
American Airlines Logo
6:00 am - 12:24 pm
STL
-
YUL
5h 24m
1 stop
$467American Airlines
Wed, Mar 11 - Wed, Mar 18

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
Apr 20
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
12h 16m
1 stop
STL11:46 pmLambert-St Louis
Apr 25
STL5:21 pmLambert-St Louis
17h 23m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
$349
American Airlines
Apr 20
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
12h 16m
1 stop
STL11:46 pmLambert-St Louis
Apr 25
STL8:03 pmLambert-St Louis
14h 41m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
$350
American Airlines
Apr 20
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
12h 16m
1 stop
STL11:46 pmLambert-St Louis
Apr 25
STL8:03 pmLambert-St Louis
14h 41m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
$352

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

Our best Air Canada deals on Montreal Pierre Elliott Trudeau Intl Airport to St. Louis flight tickets
Air Canada
Mar 13
YUL8:50 amMontreal Pierre Elliott Trudeau Intl
7h 39m
2 stops
STL3:29 pmLambert-St Louis
Mar 15
STL4:05 pmLambert-St Louis
6h 27m
1 stop
YUL11:32 pmMontreal Pierre Elliott Trudeau Intl
$448
Air Canada
Mar 12
YUL8:50 amMontreal Pierre Elliott Trudeau Intl
7h 39m
2 stops
STL3:29 pmLambert-St Louis
Mar 16
STL4:05 pmLambert-St Louis
6h 27m
1 stop
YUL11:32 pmMontreal Pierre Elliott Trudeau Intl
$451
Air Canada
Mar 12
YUL11:10 amMontreal Pierre Elliott Trudeau Intl
5h 19m
1 stop
STL3:29 pmLambert-St Louis
Mar 16
STL4:05 pmLambert-St Louis
6h 27m
1 stop
YUL11:32 pmMontreal Pierre Elliott Trudeau Intl
$455

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 February 4, 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

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

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

$352

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

5:46 am-11:44 am

1 stop4h 58m

$419

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

Thu 3/12

8:50 am-3:29 pm

2 stops7h 39m

Lambert-St Louis

Mon 3/16

4:05 pm-11:32 pm

1 stop6h 27m

$451

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 3/12

11:10 am-3:29 pm

1 stop5h 19m

Lambert-St Louis

Mon 3/16

4:05 pm-11:32 pm

1 stop6h 27m

$455

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

Wed 3/11

3:45 pm-11:44 pm

1 stop8h 59m

Lambert-St Louis

Wed 3/18

7:05 am-1:45 pm

1 stop5h 40m

$458

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 3/11

12:59 pm-11:44 pm

2 stops11h 45m

Lambert-St Louis

Wed 3/18

6:00 am-12:24 pm

1 stop5h 24m

$467

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, 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 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?

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

Fastest flight time

2h 55m

Direct flights

Mon, Wed, Fri and Sun

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, Wednesday, Friday and Sunday. 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
10,688 reviews
Search Air Canada flights
DeltaPriceFrom $452Free CancellationRating
7.9
8,146 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?

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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