STL - YUL

$171 Find Cheap Flights from St. Louis to Montreal

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Montreal departing on 5/11. 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 Montreal Pierre Elliott Trudeau Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Montreal, 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 St. Louis to Montreal, 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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Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$383
Typical prices: $705-$746
American Airlines
Wed 4/8Wed 4/15
STL - YUL • 1 stop
Cheapest non-stop
$545
Air Canada
Sat 5/2Mon 5/4
STL - YUL • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
United's Priority Boarding helps with carry-on space.
Avoid peak hours at STL to minimize wait times.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Cheapest • from $383 (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 $536 (round-trip)
Shortest trip • 4h 30m (one-way)
Insights
Insights
Insights
Insights
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 Montreal!
Flight Deals
Booking Insights
Expert advice
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Montreal 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 St. Louis to Montreal

Wed, Apr 8 - Wed, Apr 15
American Airlines Logo
8:03 pm - 11:44 am
STL
-
YUL
14h 41m
1 stop
American Airlines Logo
12:30 pm - 10:17 pm
YUL
-
STL
10h 47m
1 stop
$383American Airlines
Wed, Apr 8 - Wed, Apr 15
American Airlines Logo
8:54 am - 9:37 pm
STL
-
YUL
11h 43m
2 stops
American Airlines Logo
12:30 pm - 10:17 pm
YUL
-
STL
10h 47m
1 stop
$393American Airlines
Wed, Apr 8 - Wed, Apr 15
American Airlines Logo
8:54 am - 9:37 pm
STL
-
YUL
11h 43m
2 stops
American Airlines Logo
1:03 pm - 11:46 pm
YUL
-
STL
11h 43m
2 stops
$398American Airlines
Sat, Apr 11 - Sat, Apr 18
American Airlines Logo
8:03 pm - 11:44 am
STL
-
YUL
14h 41m
1 stop
American Airlines Logo
12:30 pm - 11:46 pm
YUL
-
STL
12h 16m
1 stop
$401American Airlines
Sat, Apr 11 - Sat, Apr 18
American Airlines Logo
2:33 pm - 11:44 am
STL
-
YUL
20h 11m
1 stop
American Airlines Logo
1:03 pm - 11:46 pm
YUL
-
STL
11h 43m
2 stops
$411American Airlines
Sat, Apr 11 - Sat, Apr 18
American Airlines Logo
7:05 am - 9:37 pm
STL
-
YUL
13h 32m
2 stops
American Airlines Logo
1:03 pm - 11:46 pm
YUL
-
STL
11h 43m
2 stops
$416American Airlines
Mon, Apr 27 - Mon, May 4
American Airlines Logo
5:21 pm - 11:44 am
STL
-
YUL
17h 23m
1 stop
American Airlines Logo
12:30 pm - 10:17 pm
YUL
-
STL
10h 47m
1 stop
$422American Airlines
Sat, May 23 - Tue, May 26
American Airlines Logo
8:02 pm - 11:44 am
STL
-
YUL
14h 42m
1 stop
American Airlines Logo
12:30 pm - 11:54 pm
YUL
-
STL
12h 24m
1 stop
$423American Airlines
Mon, Apr 27 - Mon, May 4
American Airlines Logo
8:03 pm - 11:44 am
STL
-
YUL
14h 41m
1 stop
American Airlines Logo
1:03 pm - 11:46 pm
YUL
-
STL
11h 43m
2 stops
$431American Airlines
Sat, Apr 25 - Sat, May 2
American Airlines Logo
8:03 pm - 11:44 am
STL
-
YUL
14h 41m
1 stop
American Airlines Logo
12:30 pm - 8:09 pm
YUL
-
STL
8h 39m
1 stop
$443American Airlines
Booking Insights

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

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

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

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

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

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

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

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

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 $636 on average.

Expert advice

Expert advice for your flight from St. Louis to Montreal

 
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 Air Canada and United Airlines

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 seasonJuly
Cheapest flight$171
Best time to beat the crowds with an average 46% drop in price.
Most popular time to fly and prices are also 46% lower on average.
Flight from St. Louis to Montreal

When to book flights from St. Louis to Montreal

Are your dates flexible? Find out the best times to travel from St. Louis to Montreal 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 St. Louis to Montreal flights

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

    In the last 3 days, the lowest price for a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport was $171 for a one-way ticket and $383 for a round-trip.

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

    Yes, you'll most likely have to show a valid passport before boarding the plane in St. Louis and on arrival in Montreal.

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

    Lufthansa, Japan Airlines, Air Canada, and United Airlines offer inflight Wi-Fi service on the St. Louis to Montreal flight route.

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

    The Boeing 787-8 Dreamliner is the aircraft model that flies most regularly on the St. Louis to Montreal flight route.

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

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

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

    The two airlines most popular with KAYAK users for flights from St. Louis to Montreal are Delta and United Airlines. With an average price for the route of $684 and an overall rating of 7.9, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $765 and an overall rating of 7.4.

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

    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 St. Louis to Montreal.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Montreal from St. Louis 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 St. Louis to Montreal?

    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 Montreal with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and YUL 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 St. Louis to Montreal?

    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 Montreal from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport

  • Looking for a cheap flight? 25% of our users found flights on this route for $315 or less one-way and $864 or less round-trip.

Prefer to fly direct from St. Louis to Montreal?

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

Direct departures

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

Direct returns

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

Reviews of the top 4 airlines serving from St. Louis to Montreal

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Montreal. 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 St. Louis to Montreal? 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 8292 reviews
8.5Crew
7.8Entertainment
7.9Comfort
7.2Food
8.1Boarding
Airline reviews

We landed and sat on the tarmac for 45 minutes because they only have one gate at the airport and there was another plane running late so we had to wait

2.0 MediocreSusan, Mar 2026
JAX - ATL
Read more Delta reviews

We landed and sat on the tarmac for 45 minutes because they only have one gate at the airport and there was another plane running late so we had to wait

The WiFi was not working. That made for a long flight.

With Aeromexico it ended up good but with Delta it was bad because we did everything through Delta... Showed up at the Delta terminal... It was the wrong place! Nothing ever told us to go to the Aeromexico terminal. It said "in partnership with Aeromexico" but I was never instructed to check in with them or go to their terminal. We had to haul @$$ running through the airport and almost didn't make it thanks to this poor communication. 👎🏽

Absolutely no communication on why there's a delay and multiple flight time reschedules. I would have canceled the flight and drove back home if I known it was going to be rescheduled 3 or 4 times.

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!

Entertainment kept turning itself off. Gave up on watching a movie.

Wifi took a while to kick in and we had a maintenance issue that took over 40 mins at the gate in Washington before pulling back

Fine not above and beyond as I had a connection that was delayed due to maintenance

HORRIBLE, my initial flight was cancelled, they made me pay $200 extra dollars and that got cancelled as well! After 6 cancellations I decided to get a refund because I needed to get home to my babies. Out of $1000+ dollars they offered me only $40 in refund! Totally unacceptable! The flight that they cancelled I was able to fly it on another airline. I had to spend $400 on one way tickets just to get home! I’m still getting the runaround.

Flight was delayed. De-icing took a while. When we landed had to wait for another plane to vacate our gate. Just an overall bad experience.

Not United Airlines' fault. It's ORL airport's fault.

United overall experience is great these days. Airport experience was very organized. Staff on flight were great. App and information as good as it gets.

Very nice flight love the small aircraft. We had a wonderful flight attendant. Nice to see someone that really enjoys her job. Don't have her name but had a southern accent.

Seats in waiting area and on plane hard as rock. Fast internet on the flight was great! Crew was kind.

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

Easy boarding. Rows are smaller but that may be an older and bigger me now :)

It would have been nice if American tried to care.

American Airlines did everything they could with the high Spring Break crowd. I was frustrated to be changed from 1st class to a middle seat at the back of the plane. This has happened before, not sure booking 1st class and paying the extra actually works.

I booked 1st class, my flights were changed and I was sitting in the middle at the back of the plane. A far cry from the 1st class I purchased for my flights. I am grateful I arrived on time.

Aging planer and NO wifi on a 14 hour day flight. Unless you are retired or don't need to work or be in touch with the world... The lack of Wifif really ruined the flight. And the old plane - really showing it's age, wasn't great

There was no beverage service and the only time I saw a crew member walk through the cabin is when we were preparing to land.

Our flight was delayed 3 times and this is why I am giving such low reviews. Everything else was okay but being in the airport at 4:30pm for my initial flight at 7pm to not leave until after 9:30pm is insane,

Flights were constantly delayed. CRW took 50 minutes to get bags

Flight has been delayed every time I've ever taken it. Seats uncomfortable. Children behind me yelling the entire flight. Some of this is out of their control but overall just consistently not a great experience.

Appreciate having multiple food options for allergies. Nice to have an extra seat between us for comfort.

I checked a bag and there was only one agent to assist all customers with any issues.

Great setup on both flights except the last flight we got condensed dripping all over me in the last 20 mins of the flight

Couldn't fit knees, only 1 toilet working, didn't get anything to drink cause the stewards were not able to get to us

Our biggest complaint about Air Canada is that if you don’t like your seat during check-in, there’s a fee to move elsewhere. On our flight from YUL to FFL, we were charged to change seats—just regular seats. What’s maddening is that the plane wasn’t even full; there were even a few people sleeping in the middle row sections (entire rows, completely empty), using them as beds. In my opinion, charging passengers for seat changes is a cash grab by Air Canada. They are definitely not the airline they were back in the day. I suppose they need to gouge the consumer now that they pay their attendants while on ground. One out of 10.

Allow me to book extra bag check in as free though I packed in 1 luggage but that was 7 LBS overweight so make another bag to free check in.

Plane left an hour late, I missed my connection and my bow case was never even loaded on the plane in VA. I deal with this type of nonsense everytime I fly air canada.

It was a smooth flight both in the sky and landing!

Fare was great, seat comfort the opposite as cushion was worn out. Ok for 2 hour flight, not for 4.5 hour flight..

For the price, it was a really good experience. There was no entertainment on board, so I couldn't really rate this, and I didn't order a meal. I appreciated that there was a free glass of wine.

Very bad, flight was cancelled due to strike and staff was unable to rebook us

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

Information on your arrival and departure airports