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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 9/10. 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.
American Airlines Logo
12:31 pm - 12:27 amYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
12h 56m1 stop Chicago O'Hare Intl
American Airlines Logo
5:18 pm - 11:44 amSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
17h 26m1 stop Chicago O'Hare Intl
$452American Airlines
Mon, Sep 21 - Mon, Sep 28
American Airlines Logo
12:30 pm - 8:57 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
9h 27m1 stop Chicago O'Hare Intl
American Airlines Logo
5:27 pm - 11:44 amSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
17h 17m1 stop Chicago O'Hare Intl
$471American Airlines
Thu, Oct 15 - Mon, Oct 19
American Airlines Logo
12:30 pm - 8:57 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
9h 27m1 stop Chicago O'Hare Intl
American Airlines Logo
5:27 pm - 11:44 amSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
17h 17m1 stop Chicago O'Hare Intl
$473American Airlines
Thu, Oct 15 - Mon, Oct 19
American Airlines Logo
12:31 pm - 12:27 amYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
12h 56m1 stop Chicago O'Hare Intl
American Airlines Logo
5:18 pm - 11:44 amSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
17h 26m1 stop Chicago O'Hare Intl
$474American Airlines
Mon, Sep 21 - Mon, Sep 28
Air Canada Logo
4:55 pm - 6:42 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
2h 47mnonstop
Air Canada Logo
12:10 pm - 3:42 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
2h 32mnonstop
$476Air Canada
Fri, Sep 4 - Mon, Sep 7
American Airlines Logo
5:34 pm - 8:24 amYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
15h 50m1 stop Chicago O'Hare Intl
American Airlines Logo
8:07 pm - 11:43 amSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
14h 36m1 stop Chicago O'Hare Intl
$478American Airlines
Fri, Sep 4 - Mon, Sep 7
Air Canada Logo
4:55 pm - 6:42 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
2h 47mnonstop
Air Canada Logo
12:10 pm - 3:42 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
2h 32mnonstop
$486Air Canada
Fri, Aug 28 - Sun, Aug 30
Air Canada Logo
4:55 pm - 6:41 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
2h 46mnonstop
Air Canada Logo
12:10 pm - 3:41 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
2h 31mnonstop
$486Air Canada
Thu, Oct 15 - Mon, Oct 19
Air Canada Logo
4:55 pm - 6:42 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
2h 47mnonstop
Air Canada Logo
12:10 pm - 3:42 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
2h 32mnonstop
$487Air Canada
Thu, Sep 3 - Sun, Sep 6
Air Canada Logo
4:55 pm - 6:41 pmYUL  Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis
2h 46mnonstop
Air Canada Logo
12:10 pm - 3:41 pmSTL  Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl
2h 31mnonstop
$487Air Canada
Thu, Oct 15 - Mon, Oct 19

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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
Sep 4
YUL4:55 pmMontreal Pierre Elliott Trudeau Intl
2h 47m
STL6:42 pmLambert-St Louis
Sep 7
STL12:10 pmLambert-St Louis
2h 32m
YUL3:42 pmMontreal Pierre Elliott Trudeau Intl
$476
Air Canada
Aug 28
YUL4:55 pmMontreal Pierre Elliott Trudeau Intl
2h 47m
STL6:42 pmLambert-St Louis
Aug 30
STL12:10 pmLambert-St Louis
2h 32m
YUL3:42 pmMontreal Pierre Elliott Trudeau Intl
$486
Air Canada
Aug 29
YUL4:55 pmMontreal Pierre Elliott Trudeau Intl
2h 47m
STL6:42 pmLambert-St Louis
Aug 30
STL12:10 pmLambert-St Louis
2h 32m
YUL3:42 pmMontreal Pierre Elliott Trudeau Intl
$487

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
Oct 15
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
9h 27m
1 stop
STL8:57 pmLambert-St Louis
Oct 19
STL5:27 pmLambert-St Louis
17h 17m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
$471
American Airlines
Oct 15
YUL12:30 pmMontreal Pierre Elliott Trudeau Intl
9h 27m
1 stop
STL8:57 pmLambert-St Louis
Oct 19
STL5:27 pmLambert-St Louis
17h 17m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
$473
American Airlines
Sep 21
YUL12:31 pmMontreal Pierre Elliott Trudeau Intl
12h 56m
1 stop
STL12:27 amLambert-St Louis
Sep 28
STL5:18 pmLambert-St Louis
17h 26m
1 stop
YUL11:44 amMontreal Pierre Elliott Trudeau Intl
$474

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 August 10, 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 Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 9/21

12:31 pm-12:27 am

1 stop12h 56m

Lambert-St Louis

Mon 9/28

5:18 pm-11:44 am

1 stop17h 26m

$452

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 10/15

12:30 pm-8:57 pm

1 stop9h 27m

Lambert-St Louis

Mon 10/19

5:27 pm-11:44 am

1 stop17h 17m

$471

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 10/15

12:30 pm-8:57 pm

1 stop9h 27m

Lambert-St Louis

Mon 10/19

5:27 pm-11:44 am

1 stop17h 17m

$473

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 9/21

12:31 pm-12:27 am

1 stop12h 56m

Lambert-St Louis

Mon 9/28

5:18 pm-11:44 am

1 stop17h 26m

$474

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 9/4

4:55 pm-6:42 pm

Nonstop2h 47m

Lambert-St Louis

Mon 9/7

12:10 pm-3:42 pm

Nonstop2h 32m

$476

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 9/4

5:34 pm-8:24 am

1 stop15h 50m

Lambert-St Louis

Mon 9/7

8:07 pm-11:43 am

1 stop14h 36m

$478

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 8/28

4:55 pm-6:42 pm

Nonstop2h 47m

Lambert-St Louis

Sun 8/30

12:10 pm-3:42 pm

Nonstop2h 32m

$486
Quickest round-trip

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

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

$486

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 9/3

4:55 pm-6:42 pm

Nonstop2h 47m

Lambert-St Louis

Sun 9/6

12:10 pm-3:42 pm

Nonstop2h 32m

$487

MontrealSt. Louis

YUL Montreal Pierre Elliott Trudeau Intl - STL Lambert-St Louis

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

$487

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?

Prices are currently typical for flights on this route.

Typical prices usually range from $441 to $789.
The lowest price recently found on this route was $452.

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

In general, August 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 $442. The month of November is another great option to travel to St. Louis, with average flight prices from Montreal Pierre Elliott Trudeau Intl Airport averaging around $542.

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 Thursday when prices can be found for as low as $567. 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 is only 1 cabin class 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?

You could potentially save up to 6% 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 46m

Direct flights

Every day

Airports in St. Louis

1 airport
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 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

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 $498Free CancellationRating
7.1
11,458 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 $498 round-trip. Over the 7 Air Canada flights for this route in a normal week, average airfare is usually $567 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
St. Peters
Maryland Heights
Florissant
Collinsville
Alton
O'Fallon
Clayton
Farmington
Fenton
Wentzville
Festus
Eureka
Edwardsville
Litchfield
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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