YUL - STL

C$ 340 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 24/8. 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
Travellers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 20% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Free to useThere are no hidden charges or fees.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
C$ 608
Typical prices: C$ 782-C$ 731
American Airlines
Wed 23/9Fri 25/9
YUL - STL • 1 stop
Cheapest direct flights
C$ 678
Air Canada
Thu 15/10Mon 19/10
YUL - STL • Direct
Top airlines
Cheapest • from C$ 608 (round-trip)
Best reviews • 7.1 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Direct flights
You can fly direct with Air Canada. Average duration is 2h 51m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg C$ 941 (round-trip)
Shortest trip • 4h 40m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 13% price drop
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, 23 Sep - Fri, 25 Sep
American Airlines Logo
12:31 p.m. - 12:27 a.m.
YUL
-
STL
12h 56m
1 stop
American Airlines Logo
4:37 p.m. - 9:49 a.m.
STL
-
YUL
16h 12m
1 stop
C$ 608American Airlines
Tue, 18 Aug - Sat, 7 Nov
American Airlines Logo
5:34 p.m. - 8:23 a.m.
YUL
-
STL
15h 49m
1 stop
American Airlines Logo
6:00 a.m. - 3:11 p.m.
STL
-
YUL
8h 11m
1 stop
C$ 646American Airlines
Tue, 21 Jul - Tue, 28 Jul
United Airlines Logo
6:30 p.m. - 8:49 a.m.
YUL
-
STL
15h 19m
1 stop
United Airlines Logo
1:13 p.m. - 5:30 p.m.
STL
-
YUL
27h 17m
1 stop
C$ 671United 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$ 678Air Canada
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$ 680Air Canada
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$ 681Air Canada
Wed, 4 Nov - Sat, 7 Nov
Delta Logo
9:28 a.m. - 8:51 p.m.
YUL
-
STL
12h 23m
1 stop
Delta Logo
6:00 a.m. - 1:36 p.m.
STL
-
YUL
6h 36m
1 stop
C$ 684Delta
Thu, 1 Oct - Sun, 4 Oct
Air Canada Logo
10:10 a.m. - 2:00 p.m.
YUL
-
STL
4h 50m
1 stop
Air Canada Logo
12:10 p.m. - 3:41 p.m.
STL
-
YUL
2h 31mdirect
C$ 685Air Canada
Wed, 4 Nov - Sat, 7 Nov
United Airlines Logo
3:00 p.m. - 7:40 p.m.
YUL
-
STL
5h 40m
1 stop
United Airlines Logo
6:40 a.m. - 3:02 p.m.
STL
-
YUL
7h 22m
2 stops
C$ 687United Airlines
Thu, 15 Oct - Mon, 19 Oct
Delta Logo
6:00 a.m. - 1:20 p.m.
YUL
-
STL
8h 20m
1 stop
Delta Logo
3:42 p.m. - 11:51 p.m.
STL
-
YUL
7h 09m
1 stop
C$ 688Delta
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 September.

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$ 758 (return) on average. On the other hand, the most expensive months are December and January, where the average cost of round-trip tickets is C$ 1,088 and C$ 1,060 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.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at C$ 680 on average.

Good to know

Low seasonJanuary
Cheapest flightC$ 340
Best time to beat the crowds but there is an average 22% increase in price.
Most popular time to fly and prices are also 3% 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$ 338 for a one-way ticket and C$ 608 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 11194 reviews
6.3Food
6.8Entertainment
7.8Crew
7.3Boarding
7.1Comfort
Airline reviews

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

10.0 ExcellentAnonymous, May 2026
YUL - LAX
Read more Air Canada reviews

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.

We left over 2 hours late and they didn't even give us a complimentary snack, when getting to the desk I asked if I could be put in a row with only 1 other person or an empt y one I was told the flight was full when the last two rows were empty. All around over it

Air Canada’s problems are not staff related by and large, no. The problem is tiny jets between the U.S. and Canada - yes, believe it or not they are still “international” (just ask our own Mango Maniac in power in the U.S.). The little aisle is compounded by a design flaw of a “dog leg” starting at seat 12. Woe be unto you if you sit here as passengers and attendants do not have sufficient room to not hit you in the face with backpacks. One thing I will say very positively about Air Canada is you still provide pillows and blankets on transcontinental flights to all, not just the elites. Your tiny improperly designed jets are also a problem flying city to city within Canada also. One can only say you remind us of a “Jet Blue” or “Spirit” experience. Also your luggage space is downright Byzantine! We will endeavor to avoid you and use other U.S. carriers, albeit charging more.

Terrible canceled flight and lost my luggage. Flew me to Halifax. Tgat flight was delayed, had to spend night in airport chair.

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

Information on your arrival and departure airports