STL - YUL

$265 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 12/22. 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
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Everything you should know

Cheapest round-trip
$354
Overall average: $1,289
American Airlines
Mon 2/2Wed 2/4
STL - YUL • 1 stop
Cheapest non-stop
$910
Air Canada
Wed 6/3Sun 6/14
STL - YUL • Non-stop
Our travelers' advice
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
When to travel
July
Cheapest • 49% price drop
July
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 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

Mon, Feb 2 - Wed, Feb 4
American Airlines Logo
6:44 pm - 3:08 pm
STL
-
YUL
19h 24m1 stop
American Airlines Logo
3:50 pm - 10:20 am
YUL
-
STL
19h 30m1 stop
$354American Airlines
Mon, Feb 2 - Wed, Feb 4
American Airlines Logo
11:05 am - 10:59 pm
STL
-
YUL
10h 54m2 stops
American Airlines Logo
3:50 pm - 10:20 am
YUL
-
STL
19h 30m1 stop
$363American Airlines
Mon, Feb 2 - Wed, Feb 4
American Airlines Logo
11:05 am - 10:59 pm
STL
-
YUL
10h 54m2 stops
American Airlines Logo
7:30 am - 6:14 pm
YUL
-
STL
11h 44m2 stops
$369American Airlines
Sun, Jan 11 - Sun, Jan 18
Multiple Airlines Logo
12:37 pm - 7:05 am
STL
-
YUL
17h 28m2 stops
Multiple Airlines Logo
4:35 pm - 10:34 pm
YUL
-
STL
30h 59m1 stop
$423Multiple Airlines
Thu, Feb 26 - Mon, Mar 2
American Airlines Logo
6:00 am - 3:05 pm
STL
-
YUL
8h 05m1 stop
American Airlines Logo
3:55 pm - 9:29 am
YUL
-
STL
18h 34m1 stop
$429American Airlines
Sat, Jan 31 - Mon, Feb 2
Multiple Airlines Logo
12:12 pm - 12:30 am
STL
-
YUL
11h 18m1 stop
Multiple Airlines Logo
6:45 am - 11:33 pm
YUL
-
STL
17h 48m2 stops
$430Multiple Airlines
Fri, Jan 16 - Sun, Jan 18
Multiple Airlines Logo
1:35 pm - 7:05 am
STL
-
YUL
16h 30m2 stops
Multiple Airlines Logo
4:35 pm - 7:54 am
YUL
-
STL
16h 19m1 stop
$498Multiple Airlines
Wed, Mar 18 - Sun, Mar 22
Multiple Airlines Logo
12:14 pm - 7:05 am
STL
-
YUL
17h 51m2 stops
Multiple Airlines Logo
4:35 pm - 7:07 am
YUL
-
STL
15h 32m1 stop
$532Multiple Airlines
Thu, Jan 15 - Sun, Jan 18
Multiple Airlines Logo
5:11 pm - 12:43 am
STL
-
YUL
30h 32m2 stops
Multiple Airlines Logo
4:35 pm - 7:54 am
YUL
-
STL
16h 19m1 stop
$534Multiple Airlines
Thu, Jan 29 - Thu, Feb 5
Multiple Airlines Logo
10:01 pm - 7:05 am
STL
-
YUL
32h 04m2 stops
Multiple Airlines Logo
12:50 pm - 6:51 am
YUL
-
STL
19h 01m1 stop
$536Multiple 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.

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 Friday, and avoid Thursdays for better deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport, 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 St. Louis to Montreal Pierre Elliott Trudeau Intl Airport is July, where tickets cost $356 (return) on average. On the other hand, the most expensive months are February and March, where the average cost of round-trip tickets is $1,289 and $808 respectively.

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.

No, with an average price for the route of $683, prices are generally cheapest when you fly direct.

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.
Airlines
Air Canada

Air Canada offers priority check-in for higher fare classes and elite status members.


Air Canada’s Wi-Fi is available on select flights; check availability five days before departure.

United Airlines

United offers Priority Boarding to avoid gate-checking carry-ons, placing you in Zone 2.


United's Wi-Fi varies; T-Mobile customers often get free streaming Wi-Fi.

Airports
STL

Avoid peak hours at STL to minimize wait times. Early mornings and afternoons are busiest, especially at Terminal 2.

YUL

Take the 747 bus from YUL to downtown Montréal. It's affordable and runs 24/7, though it can be crowded.

Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on Air Canada and United Airlines

Stefanie Waldek

Stefanie Waldek

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.

Read more
Brandon Schultz

Brandon Schultz

Expert on YUL

Brandon Schultz

Brandon Schultz

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.

Read more
Yulia Denisyuk

Yulia Denisyuk

Expert on STL

Yulia Denisyuk

Yulia Denisyuk

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.

Read more

Good to know

Low seasonFebruary
Cheapest flight$257
Best time to beat the crowds but there is an average 83% increase in price.
Most popular time to fly and prices are also 50% 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 $257 for a one-way ticket and $354 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?

    United Airlines, Lufthansa, and Japan 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?

    oneworld, SkyTeam, and Star Alliance are the airline alliances operating flights between St. Louis and Montreal, with oneworld 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 $681 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 $466 or less one-way and $752 or less round-trip.

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 8009 reviews
8.5Crew
7.9Entertainment
7.9Comfort
7.3Food
8.1Boarding
Airline reviews

None of the airplane features were available during the flight.

4.0 OkayAnonymous, Dec 2025
JFK - SDQ
Read more Delta reviews

None of the airplane features were available during the flight.

Original flight was cancelled and when i was rebooked by the airline, they couldn't seat me in the same type of seat as I had originally booked (went from window/aisle to middle/middle and one was a bulkhead seat, and other wasn't in the same class)

Lady Pilot was perfect in every way wheels up to wheels down communication, professionalism, excellent on time departure and on time arrival, excellent communication! Fantastic job with Superb attitude!!

The food is terrible. The staff is wonderful. Comfort is good.

Left on time, a bit delayed due to headwinds most of the trip.

I fly Delta all the time, have Platinum Medallion status. But this route seems to have major problems with delays and seems to never leave on time! Have only taken it twice in the last two weeks, and each time it had delays of more than 1 hour... very disappointed!!!!

Getting to the flight was arduous and lengthy. The flight itself was good but the food option wasn’t a good selection. I need to do a Kosher option on my return. Flight crew were nice

Good seats in Main cabin, excellent service and excellent landing

My flight was cancelled with no explanation after I had already cleared security. I was given 4 options to rebook, only one being non-stop like I had paid for. I grabbed it. It was 4 plus hours later and then took off even later. Biggest complaint is that I booked early and had an aisle seat. They gave me a "window" seat in front of the exit row, so the seat did not decline. I weigh all of 103 #s and it was tight for me! For what I paid, I feel I was kind of ripped off. I think they should have given me the empty comfort seat for the inconvenience. There was no apology nor any explanation as to why the flight was cancelled. My guess is it benefitted Delta in some way.

Very smooth, on-time, and pleasantly uneventful flight. The team at the gate and on board were professional and genuinely courteous. The pilot kept us well updated throughout, and both takeoff and landing were steady and enjoyable without any drama. Just a good, solid flight. Thank you! 💗

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.

Not the fault of United—weather, reroute around weather, time sitting on tarmac, arrived couple hours late, too late for train into city necessitating a much pricier cab but weather…can’t be helped.

Flight was good but there are way to many announcements for credit cards etc.

I had no checked baggage but was required to hand over carry on baggage at the door of the plane. There was a lot of overboard space in the plane and I was one of the last ones. I ran to get my carry on but it was gone. I was given back at the plane door in Toronto, so the wait was not as long as it would have been at the carousel.

We had a layover from YVR to Denver. We bought 4 bottles of Absolut Vodka at the YVR Duty Free for $116.20, after going through security and American Customs Pre Clearance at YVR, Vancouver. When we landed in Denver, United put us behind the American Customs as well as TSA again for some reason. We were forced to go through American Customs and TSA again. TSA confiscated our rightfully owned Duty Free Absolut Vodka bottles. Because United incorrectly forced our flight behind American border and TSA again, we missed the connecting flight. After United put us on a later flight, we eventually arrived in Chicago very late, with hardly any sleep. I am looking for compensation from United for our incorrectly confiscated Absolut Vodka bottles worth $116.20, as well as compensation for incorrectly putting us behind American Customs and TSA again, causing us to miss our connecting flight, making us arrive extremely late in Chicago.

From the first moment you interact with United Airlines, you can expect nothing less but extreme frustration. The baggage handler at the bag drop seems completely unbothered by the presence of customers waiting in line. No help was extended to load the baggage whatsoever. And if any of your bags is overweight by 0.01 pound they will make you re-distribute everything in your suitcase just to play power trip. When it was time to board no help was extended to customers to locate their seats. Moreover. It was a chaotic mess at the gate when it was unclear who should board first and everyone just bunched up, trying to get on the plane. I am sure the crew was doing their best to perform their jobs while being paid their wages however it shouldn’t be that hard to smile once or twice when you’re in the business if serving customers. It is a shame for the United States of America to have a flagship carrier of such low caliber. Our flight was also delayed by about an hour and a half due to further delays prior to our inbound flight. Being someone who has travelled for both business and leisure in Asia, Europe, and South America I have never experienced such poor quality of service.

The pilots were late and it made us 1 hour late. The meat was tough and bok choy was also tough.

Gate was overcrowded. Gate agents performed very well. Flight crew was top notch! Efficient & professional & courteous. Both meals not thermalized well. Dinner main dish was actually cold in the center. Almost inedible. Breakfast sandwich was lukewarm.

The boarding was as always, the crew tried their best but not enough. The food was a disaster I had dietary restrictions that were half met because the company did not loaded the food for the flight. The entertainment screen was fine but content was not and also they removed the free messaging option from the flight and they charged 30 dollars for that crappy bandwidth. This flight is not worth the cost and the company is going down on quality.

Not comparable to Qatar Airways services on flights to Doha. Flight attendants provided basic services; I was never recognized by name or as an Executive Platinum member. Restrooms were not kept clean during the flight.

Awful. They won’t help me with anything. I booked on American but they abdicated to Iberia. The ticket was overpriced. Everything negative

it was fine, decent flight... dont get food besides cookies or pretzels so not sure why you ask about food. same for entertainment..

I got sick nothing contagious but distressing and the care I received by Kayla? Keighly the flight attendant will be memorable for ever. Thank You

I got sick nothing contagious but distressing enough and the care I received on the flight was astounding.

Waaay too small plane. They also need to up the size of the overhead bins. I would love to keep me 3k with of camera equipment in my hard case baggahe instead of it being thrown into the belly of the plane

Attendants were pleasant and the flight was smooth and relaxed.

A little late at the start but all worked out well.

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

Air Canada is my new fave airline..I plan to use when I can. No complaints at all just rave compliments for the staff and airline.

Strike pissed me n stranded in middle of no where

No paper towels in bathroom. Aisle seat difficult to get out of Other than those, excellent service

Plane was packed but flew on-time, and the comfort level was great! All planes are a bit cramped, but the in flight entertainment was superb, snacks were nice, and the crew was polite. Got into Calgary on schedule...all we could ask for

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

Information on your arrival and departure airports