YUL - STL

$203 Find Cheap Flights from Montreal to St. Louis

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 4/6. 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
Travelers love KAYAK
41.299.237 searches in the past 7 days on KAYAK

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Bundle and saveSave money when you bundle your flight + hotel.

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

Everything you should know

Cheapest round-trip
$358
Overall average: $485
American Airlines
Mon 4/20Sat 4/25
YUL - STL • 1 stop
Cheapest non-stop
$497
Air Canada
Tue 5/5Fri 5/8
YUL - STL • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
United's Economy Plus offers six extra inches of legroom.
Use MetroLink for easy access from STL to downtown.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Cheapest • from $358 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with Air Canada. Average duration is 0
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $589 (round-trip)
Shortest trip • 4h 51m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 25% 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 100s of sites at once to find you the best travel deals.
We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Expert advice
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

Mon, Apr 20 - Sat, Apr 25
American Airlines Logo
12:30 pm - 11:46 pm
YUL
-
STL
12h 16m
1 stop
American Airlines Logo
4:30 pm - 11:44 am
STL
-
YUL
18h 14m
1 stop
$358American 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
4:30 pm - 11:44 am
STL
-
YUL
18h 14m
1 stop
$373American 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
$374American Airlines
Mon, Apr 20 - Tue, Apr 28
American Airlines Logo
12:30 pm - 10:17 pm
YUL
-
STL
10h 47m
1 stop
American Airlines Logo
8:54 am - 9:37 pm
STL
-
YUL
11h 43m
2 stops
$383American Airlines
Tue, Apr 21 - Tue, Apr 28
American Airlines Logo
1:03 pm - 11:46 pm
YUL
-
STL
11h 43m
2 stops
American Airlines Logo
8:54 am - 9:37 pm
STL
-
YUL
11h 43m
2 stops
$388American 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
2:33 pm - 11:44 am
STL
-
YUL
20h 11m
1 stop
$391American Airlines
Tue, May 5 - Fri, May 8
American Airlines Logo
12:30 pm - 11:46 pm
YUL
-
STL
12h 16m
1 stop
American Airlines Logo
6:29 am - 3:27 pm
STL
-
YUL
7h 58m
1 stop
$422American Airlines
Tue, Apr 14 - Tue, Apr 21
Multiple Airlines Logo
6:45 am - 6:50 am
YUL
-
STL
25h 05m
2 stops
Multiple Airlines Logo
4:59 pm - 12:30 am
STL
-
YUL
30h 31m
1 stop
$426Multiple Airlines
Wed, Apr 15 - Tue, Apr 21
Multiple Airlines Logo
6:45 am - 10:30 am
YUL
-
STL
28h 45m
2 stops
Multiple Airlines Logo
4:59 pm - 12:30 am
STL
-
YUL
30h 31m
1 stop
$443Multiple Airlines
Wed, Apr 15 - Sat, Apr 18
United Airlines Logo
1:20 pm - 11:11 pm
YUL
-
STL
10h 51m
1 stop
United Airlines Logo
7:45 am - 5:30 pm
STL
-
YUL
8h 45m
1 stop
$444United 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.

What’s the cheapest day of the week to fly from Montreal to St. Louis?

The average price of all round-trip flights from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to St. Louis on a Tuesday and more expensive on a Thursday. On your return trip to Montreal, you should consider flying back on a Monday, and avoid Fridays for better deals.

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 May, where tickets cost $468 (return) on average. On the other hand, the most expensive months are December and August, where the average cost of round-trip tickets is $794 and $774 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 $285, prices are generally cheapest when you fly direct.

Expert advice

Expert advice for your flight from Montreal to St. Louis

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on United Airlines and Air Canada

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Brandon Schultz

Brandon Schultz

Expert on YUL

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Yulia Denisyuk

Yulia Denisyuk

Expert on STL

Yulia is a freelance journalist who’s dispatched from 90+ countries. Her work focuses on cultures, adventure trips and air travel, appearing in NatGeo, NYT, CNTraveler, and more. For past assignments, she’s stayed with nomads in Mongolia and learned the art of Imigongo in Rwanda. She’s based in Chicago; in winter she often questions that decision.

Good to know

Low seasonJanuary
Cheapest flight$203
Best time to beat the crowds but there is an average 22% increase in price.
Most popular time to fly with an average 24% increase in price.
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 3 days, the lowest price for a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis was $203 for a one-way ticket and $358 for a round-trip.

  • Do I need a passport to fly between Montreal and St. Louis?

    Yes

  • 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?

    SkyTeam, and Star Alliance are the airline alliances operating flights between Montreal and St. Louis, with SkyTeam being the most commonly used for this route.

  • Which is the best airline for flights from Montreal to St. Louis, Delta or Air Canada?

    The two airlines most popular with KAYAK users for flights from Montreal to St. Louis are Delta and Air Canada. With an average price for the route of $542 and an overall rating of 7.9, Delta is the most popular choice. Air Canada is also a great choice for the route, with an average price of $589 and an overall rating of 7.1.

  • 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 travelers 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. Booking your flights between Montreal and STL can sometimes prove cheaper using this method.

  • 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 direct 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 direct flights

Reviews of the top airlines 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.
7.9
DeltaOverall score based on 8278 reviews
7.8Entertainment
8.5Crew
8.1Boarding
7.2Food
7.9Comfort
Airline reviews

Another late night flight and MORE men belligerently drinking and yelling. I had to move from first to economy because they were so obnoxious and disruptive. Crazy to go from a cozy chair to cardboard when you were supposed to be in first. Delta allows was too much drinking which leads to belligerent behavior.

2.0 MediocreIsabella, Mar 2026
SLC - AUS
Read more Delta reviews

Another late night flight and MORE men belligerently drinking and yelling. I had to move from first to economy because they were so obnoxious and disruptive. Crazy to go from a cozy chair to cardboard when you were supposed to be in first. Delta allows was too much drinking which leads to belligerent behavior.

I was in first class and literally the men behind me were so aggressively loud I moved myself to economy. This has become so common on Delta - people using audio without headphones, and men on 12am / late night flights drinking and yelling to talk to each other which prevents anyone around them from resting. Pretty crazy to have to move from first to economy (poorer service, less comfort...). Wild wild. Looking into other airlines.

Love delta smaller commuter plane so no entertainment and paid wifi on MKE-LGA leg was extremely unreliable and slow

Stop changing gates. Stop cancelling flights Stop moving my seat.

Extremely disappointed with Delta. They canceled flight last minute and then I rebooked the other flights and with which were delayed as well

Could not get my connecting flight boarding pass until four hrs before departure! Ver annoying especially since the staff could not explain why!

The flight was flying with 30% capacity. The flight my seat from preferred seating to back of the seat. Even though i can understand that this was to balance the flight weight. The flight attendance decided to do the serving near my seat and in the middle , their noices woke me up from sleep , when i realized that the service has ended and when they were going back asked for a coffee, for which they answered they have completed teh service in my location. That really upset me as they woke me up and also rejected the coffee i asked. I ended up landing with a headache, thanks to the crew that screwed up my travel

I wish the inflight entertainment system options were broader, but overall this was a fantastic crew and I can’t express how cheerful, welcoming, and attentive they were.

Delayed. Hot. Passenger next to me was so large I couldn’t move.

Same experience as the flight from Norfolk to Atlanta where people are boarded in zones that don't make sense. People behind you on the plane will get on before you and they take the luggage space on your row.

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.

My seat was not comfortable. Flight was smooth. Regretfully we had two delays before takeoff

They are very proactive and made our boarding easy and always notified us about any changes well in advance.

The staff could not have been any friendlier. Lots of usb ports on our aircraft.

It was crazy, boarded over a hour late from scheduled departure. Then when arrived in BNA issued with getting off the plane…over 1/2 hour. Not looking forward to flying Air Canada, ever again.

Great flight. Only complaint is it took over an hour for my luggage to get to the carousel on the return to LAX That was irritating

1 hour late No hot drinks No restroom in the back of the plane

I had wonderful wheelchair assistance through the Montreal airport onto the flight. Air Canada was excellent in this both at the Fredericton airport and the Montreal one where an attendant helped us through customs as well as transport and baggage security.

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

Information on your arrival and departure airports