YUL - STL

C$ 326 Find Cheap Flights from Montreal to St. Louis – Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Montreal to St. Louis departing on 25/8. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Montreal to St. Louis, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Montreal to St. Louis, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
C$ 654
Typical prices: C$ 628-C$ 1,122
American Airlines
Wed 12/8Tue 25/8
YUL - STL • 1 stop
Cheapest direct flights
C$ 685
Air Canada
Fri 24/7Sun 26/7
YUL - STL • Direct
Top airlines
American Airlines
Cheapest • from C$ 654 (round-trip)
Air Canada
Best reviews • 7.1 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Direct flights
Every day
You can fly direct with Air Canada. Average duration is 2h 47m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Toronto (YYZ)
Cheapest • Avg C$ 957 (round-trip)
Detroit (DTW)
Shortest trip • 4h 40m (one-way)
Insights
Insights
Insights
Insights
When to travel
November
Cheapest • 15% price drop
August
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Montreal to St. Louis (YUL-STL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Montreal to St. Louis that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Montreal to St. Louis

Wed, 12 Aug - Tue, 25 Aug
American Airlines Logo
12:30 p.m. - 12:14 a.m.
YUL
-
STL
12h 44m
1 stop
American Airlines Logo
6:00 a.m. - 4:50 p.m.
STL
-
YUL
9h 50m
1 stop
C$ 654American Airlines
Wed, 12 Aug - Sat, 22 Aug
American Airlines Logo
12:30 p.m. - 12:14 a.m.
YUL
-
STL
12h 44m
1 stop
American Airlines Logo
8:06 p.m. - 11:43 a.m.
STL
-
YUL
14h 37m
1 stop
C$ 684American Airlines
Fri, 24 Jul - Sun, 26 Jul
Air Canada Logo
4:55 p.m. - 6:42 p.m.
YUL
-
STL
2h 47mdirect
Air Canada Logo
12:10 p.m. - 3:42 p.m.
STL
-
YUL
2h 32mdirect
C$ 685Air Canada
Wed, 2 Sep - Mon, 28 Sep
American Airlines Logo
12:30 p.m. - 12:14 a.m.
YUL
-
STL
12h 44m
1 stop
American Airlines Logo
7:21 a.m. - 4:53 p.m.
STL
-
YUL
8h 32m
1 stop
C$ 687American Airlines
Thu, 15 Oct - Mon, 19 Oct
Air Canada Logo
4:55 p.m. - 6:41 p.m.
YUL
-
STL
2h 46mdirect
Air Canada Logo
12:10 p.m. - 3:41 p.m.
STL
-
YUL
2h 31mdirect
C$ 691Air Canada
Wed, 12 Aug - Fri, 21 Aug
American Airlines Logo
12:30 p.m. - 12:14 a.m.
YUL
-
STL
12h 44m
1 stop
American Airlines Logo
6:00 a.m. - 4:50 p.m.
STL
-
YUL
9h 50m
1 stop
C$ 692American Airlines
Wed, 12 Aug - Mon, 24 Aug
American Airlines Logo
12:30 p.m. - 12:14 a.m.
YUL
-
STL
12h 44m
1 stop
American Airlines Logo
8:07 p.m. - 12:27 p.m.
STL
-
YUL
15h 20m
2 stops
C$ 694American Airlines
Fri, 24 Jul - Sun, 26 Jul
Air Canada Logo
4:40 p.m. - 8:22 p.m.
YUL
-
STL
4h 42m
1 stop
Air Canada Logo
12:10 p.m. - 3:42 p.m.
STL
-
YUL
2h 32mdirect
C$ 697Air Canada
Wed, 12 Aug - Tue, 25 Aug
American Airlines Logo
12:30 p.m. - 12:14 a.m.
YUL
-
STL
12h 44m
1 stop
American Airlines Logo
8:07 p.m. - 12:27 p.m.
STL
-
YUL
15h 20m
2 stops
C$ 698American Airlines
Thu, 15 Oct - Mon, 19 Oct
United Airlines Logo
4:55 p.m. - 9:21 p.m.
YUL
-
STL
5h 26m
1 stop
United Airlines Logo
10:27 a.m. - 5:30 p.m.
STL
-
YUL
6h 03m
1 stop
C$ 699United Airlines
Booking Insights

KAYAK's insights & trends for Montreal to St. Louis flights

Get data-powered insights and trends into flights from Montreal to St. Louis to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis departing in August.

What is the cheapest month to fly from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis is November, where tickets cost C$ 771 (return) on average. On the other hand, the most expensive months are January and December, where the average cost of round-trip tickets is C$ 1,264 and C$ 1,106 respectively.

Can I save money by flying with a layover from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of C$ 693, prices are generally cheapest when you fly direct.

Find deals

Good to know

Low seasonJanuary
Cheapest flightC$ 326
Best time to beat the crowds but there is an average 40% increase in price.
Most popular time to fly and prices are also 6% lower on average.
Flight from Montreal to St. Louis

When to book flights from Montreal to St. Louis

Are your dates flexible? Find out the best times to travel from Montreal to St. Louis based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Montreal to St. Louis flights

  • What is the cheapest flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis?

    In the last 5 days, the lowest price for a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis was C$ 326 for a one-way ticket and C$ 654 for a round-trip.

  • Which airlines offer Wi-Fi service onboard planes from Montreal to St. Louis?

    Only Air Canada offers inflight Wi-Fi service on the Montreal to St. Louis flight route.

  • Which aircraft models fly most regularly from Montreal to St. Louis?

    The Airbus A220-300 is the aircraft model that flies most regularly on the Montreal to St. Louis flight route.

  • Which airline alliances offer flights from Montreal to St. Louis?

    Star Alliance is the only airline alliance operating flights between Montreal and St. Louis.

  • On which days can I fly direct from Montreal to St. Louis?

    There are direct flights from Montreal to St. Louis on a daily basis.

  • How does KAYAK find such low prices on flights from Montreal to St. Louis?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Montreal to St. Louis.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Montreal to St. Louis?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Montreal is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Montreal to St. Louis?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Montreal with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Montreal to St. Louis?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Montreal up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Prefer to fly direct from Montreal to St. Louis?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis.
Find which airlines fly direct from Montreal Pierre Elliott Trudeau Intl Airport to Lambert-St Louis Airport, which days they fly and book direct flights.

Direct departures

Montreal Pierre Elliott Trudeau Intl to Lambert-St Louis

Monday

Air Canada

Air Canada

Tuesday

Air Canada

Air Canada

Wednesday

Air Canada

Air Canada

Thursday

Air Canada

Air Canada

Friday

Air Canada

Air Canada

Saturday

Air Canada

Air Canada

Sunday

Air Canada

Air Canada

See more nonstop flights

Direct returns

Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl

Monday

Air Canada

Air Canada

Tuesday

Air Canada

Air Canada

Wednesday

Air Canada

Air Canada

Thursday

Air Canada

Air Canada

Friday

Air Canada

Air Canada

Saturday

Air Canada

Air Canada

Sunday

Air Canada

Air Canada

See more nonstop flights

Reviews of the top airline flying from Montreal to St. Louis

 
See real verified KAYAK customer reviews for airlines flying from Montreal to St. Louis. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Montreal to St. Louis? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.1
Air CanadaOverall score based on 11283 reviews
7.3Boarding
6.8Entertainment
7.1Comfort
6.3Food
7.8Crew
Airline reviews

Delayed 2 and a half hours Middle seat next to a majorly overweight guy who took up most of my seat

2.0 MediocreAnonymous, Jun 2026
YUL - FLL
Read more Air Canada reviews

Delayed 2 and a half hours Middle seat next to a majorly overweight guy who took up most of my seat

Multiple delays and gate changes resulting in arrival with a 5 hour delay.

The flight was smooth, the plane was spacious and clean, the staff was kind and the food was decent.

Pretzels were a bit dry and dusty, however it is nice to have a choice between sweet and savory snacks.

Flight crew was great, and even the crew for checking bags! I had a question for a friend of mine flying tomorrow and the man I talked to was awesome and answered my questions and looked up things for me when he didn’t have to! I was able to give her current & accurate info for her flight and she was so appreciative too!!

Another good flight experience with Air Canada. The business section did not feature the full length sleeping arrangement, but this was a shorter trip. The food was excellent. But the flight crew was truly top tier: friendly, cheerful, helpful at all the right times. Air Canada truly outshines all U.S. carriers.

After 3 hours of delays, they ended up cancelling my flight. And although I could purchase one-way tickets to get to my destination, they would not offer me these flights as compensation for the cancelled flight, and I didn't end up making it home until 13 hours after I was originally supposed to arrive. It made for an extremely strenuous end to an otherwise good trip.

Be careful about the bad policy and when purchasing seats

Very disappointed with premier lounge. Food selection very poor, both coffee machines out of order. For the price you charge for an upgrade, the seats don’t fully recline, movie selection is old. Not very good value. Asian airlines are light years ahead at a more affordable price.

Seriously need to improve the time schedule and the plans

Everything you need to know for your flight from Montreal to St. Louis

Information on your arrival and departure airports

Montreal (YUL)
St. Louis (STL)