Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Montreal to St. Louis from C$ 281

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 to St. Louis departing on 17/6. 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

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Montreal to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Air Canada Logo
6:30 p.m. - 8:25 p.m.
YUL
-
STL
2h 55mdirect
Air Canada Logo
6:00 a.m. - 1:09 p.m.
STL
-
YUL
6h 09m
1 stop
C$ 571Air Canada
Mon, 1 Jun - Sat, 6 Jun
Air Canada Logo
7:30 a.m. - 12:06 p.m.
YUL
-
STL
5h 36m
1 stop
Air Canada Logo
2:15 p.m. - 8:51 p.m.
STL
-
YUL
5h 36m
1 stop
C$ 578Air Canada
Mon, 1 Jun - Sat, 6 Jun
Air Canada Logo
6:30 p.m. - 8:25 p.m.
YUL
-
STL
2h 55mdirect
Air Canada Logo
2:15 p.m. - 8:51 p.m.
STL
-
YUL
5h 36m
1 stop
C$ 582Air Canada
Fri, 29 May - Mon, 1 Jun
Air Canada Logo
6:30 p.m. - 8:25 p.m.
YUL
-
STL
2h 55mdirect
Air Canada Logo
2:15 p.m. - 8:51 p.m.
STL
-
YUL
5h 36m
1 stop
C$ 583Air Canada
Fri, 29 May - Mon, 1 Jun
Air Canada Logo
6:30 p.m. - 8:25 p.m.
YUL
-
STL
2h 55mdirect
Air Canada Logo
8:40 a.m. - 4:21 p.m.
STL
-
YUL
6h 41m
1 stop
C$ 584Air Canada
Wed, 3 Jun - Wed, 10 Jun
Delta Logo
7:00 a.m. - 12:20 p.m.
YUL
-
STL
6h 20m
1 stop
Delta Logo
5:36 p.m. - 11:41 p.m.
STL
-
YUL
5h 05m
1 stop
C$ 590Delta
Fri, 29 May - Mon, 1 Jun
United Airlines Logo
6:35 p.m. - 12:07 p.m.
YUL
-
STL
18h 32m
2 stops
United Airlines Logo
7:05 p.m. - 10:40 a.m.
STL
-
YUL
14h 35m
1 stop
C$ 591United Airlines
Fri, 29 May - Fri, 5 Jun
Delta Logo
12:40 p.m. - 9:38 p.m.
YUL
-
STL
9h 58m
1 stop
Delta Logo
7:05 a.m. - 5:43 p.m.
STL
-
YUL
9h 38m
1 stop
C$ 592Delta
Fri, 29 May - Mon, 1 Jun
Air Canada Logo
6:30 p.m. - 8:25 p.m.
YUL
-
STL
2h 55mdirect
Air Canada Logo
2:15 p.m. - 9:50 p.m.
STL
-
YUL
6h 35m
1 stop
C$ 594Air Canada
Fri, 29 May - Mon, 1 Jun
Air Canada Logo
6:30 p.m. - 8:25 p.m.
YUL
-
STL
2h 55mdirect
Air Canada Logo
2:15 p.m. - 7:51 p.m.
STL
-
YUL
4h 36m
1 stop
C$ 595Air Canada
Tue, 2 Jun - Wed, 3 Jun

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Early arrival? 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

Delta flights from Montreal to St. Louis

Our best Delta deals on Montreal to St. Louis flight tickets
Delta
29 May
YUL7:00 a.m.Montreal Pierre Elliott Trudeau Intl
6h 20m
1 stop
STL12:20 p.m.Lambert-St Louis
1 Jun
STL5:36 p.m.Lambert-St Louis
5h 05m
1 stop
YUL11:41 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 590
Delta
29 May
YUL12:40 p.m.Montreal Pierre Elliott Trudeau Intl
9h 58m
1 stop
STL9:38 p.m.Lambert-St Louis
1 Jun
STL7:05 a.m.Lambert-St Louis
9h 38m
1 stop
YUL5:43 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 592
Delta
15 Oct
YUL7:00 a.m.Montreal Pierre Elliott Trudeau Intl
8h 40m
1 stop
STL2:40 p.m.Lambert-St Louis
19 Oct
STL3:42 p.m.Lambert-St Louis
7h 09m
1 stop
YUL11:51 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 610

Air Canada flights from Montreal to St. Louis

Our best Air Canada deals on Montreal to St. Louis flight tickets
Air Canada
1 Jun
YUL6:30 p.m.Montreal Pierre Elliott Trudeau Intl
2h 55m
STL8:25 p.m.Lambert-St Louis
6 Jun
STL6:00 a.m.Lambert-St Louis
6h 09m
1 stop
YUL1:09 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 571
Air Canada
1 Jun
YUL7:30 a.m.Montreal Pierre Elliott Trudeau Intl
5h 36m
1 stop
STL12:06 p.m.Lambert-St Louis
6 Jun
STL2:15 p.m.Lambert-St Louis
5h 36m
1 stop
YUL8:51 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 578
Air Canada
29 May
YUL6:30 p.m.Montreal Pierre Elliott Trudeau Intl
2h 55m
STL8:25 p.m.Lambert-St Louis
1 Jun
STL2:15 p.m.Lambert-St Louis
5h 36m
1 stop
YUL8:51 p.m.Montreal Pierre Elliott Trudeau Intl
C$ 582

momondo Fare Finder

 
Customize your flight search to find flights from Montreal 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 96,600 searches. Data last updated 4 May 2026.
Use the filters below to find and compare flights from Montreal 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

Mon 1/6

6:30 p.m.-8:25 p.m.

Nonstop2h 55m

Lambert-St Louis

Sat 6/6

6:00 a.m.-1:09 p.m.

1 stop6h 09m

C$ 571

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Mon 1/6

7:30 a.m.-12:06 p.m.

1 stop5h 36m

Lambert-St Louis

Sat 6/6

2:15 p.m.-8:51 p.m.

1 stop5h 36m

C$ 578

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 29/5

6:30 p.m.-8:25 p.m.

Nonstop2h 55m

Lambert-St Louis

Mon 1/6

2:15 p.m.-8:51 p.m.

1 stop5h 36m

C$ 582

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 29/5

6:30 p.m.-8:25 p.m.

Nonstop2h 55m

Lambert-St Louis

Mon 1/6

2:15 p.m.-8:51 p.m.

1 stop5h 36m

C$ 583

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Wed 3/6

6:30 p.m.-8:25 p.m.

Nonstop2h 55m

Lambert-St Louis

Wed 10/6

8:40 a.m.-4:21 p.m.

1 stop6h 41m

C$ 584

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 29/5

7:00 a.m.-12:20 p.m.

1 stop6h 20m

Lambert-St Louis

Mon 1/6

5:36 p.m.-11:41 p.m.

1 stop5h 05m

C$ 590

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 29/5

6:35 p.m.-12:07 p.m.

2 stops18h 32m

Lambert-St Louis

Fri 5/6

7:05 p.m.-10:40 a.m.

1 stop14h 35m

C$ 591

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 29/5

12:40 p.m.-9:38 p.m.

1 stop9h 58m

Lambert-St Louis

Mon 1/6

7:05 a.m.-5:43 p.m.

1 stop9h 38m

C$ 592

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 29/5

6:30 p.m.-8:25 p.m.

Nonstop2h 55m

Lambert-St Louis

Mon 1/6

2:15 p.m.-9:50 p.m.

1 stop6h 35m

C$ 594
Quickest round-trip

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Tue 2/6

6:30 p.m.-8:25 p.m.

Nonstop2h 55m

Lambert-St Louis

Wed 3/6

2:15 p.m.-7:51 p.m.

1 stop4h 36m

C$ 595

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to St. Louis from

How to get the cheapest flight ticket from Montreal 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 and St. Louis?

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

The month of December is, on average, the cheapest month to fly to St. Louis from Montreal, with most prices found around C$ 376. If you don’t want to visit St. Louis in December, then you should wait until July to fly from Montreal, when ticket prices are also cheap, with an average price of C$ 389.

What is the cheapest Montreal to Lambert-St Louis flight route?

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

Can stopping save me money on Montreal to St. Louis flights?

You could potentially save up to 22% on your flight if you consider stops on a Montreal to St. Louis flight.

When to book flights from Montreal to St. Louis

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

Cheap Montreal to St. Louis (YMQ to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Montreal to St. Louis

Fastest flight time

2h 46m

Direct flights

Every day

Airports in St. Louis

1 airport
The fastest flight from Montreal to St. Louis takes 2h 46m
Direct flights go from Montreal to St. Louis every day.
There is 1 airport in St. Louis. From Montreal there are direct flights to Lambert-St Louis (STL).
Search flight deals

Frequently asked questions about flying from Montreal to St. Louis

  • How far is Montreal to Lambert-St Louis by plane?

    The straight-line distance from Montreal to Lambert-St Louis is 1566.0 km. 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 to Lambert-St Louis Airport?

    Prices for flights from Montreal to Lambert-St Louis Airport are updated daily.

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

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Montreal 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 to St. Louis?

  • What is the most popular airline from Montreal to St. Louis?

Best airlines flying from Montreal to St. Louis

Compare and see reviews for airlines that fly from Montreal to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom C$ 582Free CancellationRating
7.1
10,995 reviews
Search Air Canada flights

  • Air Canada Flights From Montreal to St. Louis

    Across 7 Air Canada flights from Montreal to St. Louis this week, the average price was C$ 823, with the best Air Canada deals starting from C$ 582 round-trip. 10,995 users have rated Air Canada on momondo, with an average score of 7.1/10.

Why use momondo?

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

It is quick and easy to find Montreal to St. Louis flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to St. Louis that suits you.

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

Yes. All flights to St. Louis from Montreal on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once all potential Montreal to St. Louis flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from Montreal and alert you when they 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 3/6
Wed 10/6
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States