STL - YUL

$206 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 7/10. 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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Everything you should know

Cheapest round-trip
$427
Typical prices: $1,136-$639
American Airlines
Tue 10/6Tue 10/13
STL - YUL • 1 stop
Cheapest non-stop
$569
Air Canada
Fri 6/26Sun 6/28
STL - YUL • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
United Priority Boarding helps keep carry-ons onboard; Air Canada offers priority check-in.
Both airlines offer Wi-Fi on some flights; United may include free access for T-Mobile.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Cheapest • from $427 (round-trip)
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with Air Canada. Average duration is 2h 33m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $531 (round-trip)
Shortest trip • 4h 31m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 100% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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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

Tue, Oct 6 - Tue, Oct 13
American Airlines Logo
8:05 pm - 11:20 am
STL
-
YUL
14h 15m
1 stop
American Airlines Logo
12:30 pm - 8:08 pm
YUL
-
STL
8h 38m
1 stop
$427American Airlines
Sat, Sep 5 - Tue, Sep 8
American Airlines Logo
8:06 pm - 11:43 am
STL
-
YUL
14h 37m
1 stop
American Airlines Logo
5:34 pm - 10:20 am
YUL
-
STL
17h 46m
1 stop
$470American Airlines
Tue, Aug 18 - Fri, Aug 21
American Airlines Logo
6:00 am - 4:53 pm
STL
-
YUL
9h 53m
1 stop
American Airlines Logo
5:34 pm - 8:23 am
YUL
-
STL
15h 49m
1 stop
$483American Airlines
Wed, Sep 16 - Wed, Sep 23
American Airlines Logo
5:00 am - 4:53 pm
STL
-
YUL
10h 53m
1 stop
American Airlines Logo
5:34 pm - 10:20 am
YUL
-
STL
17h 46m
1 stop
$513American Airlines
Sat, Aug 8 - Tue, Aug 18
American Airlines Logo
5:00 am - 4:54 pm
STL
-
YUL
10h 54m
1 stop
American Airlines Logo
12:30 pm - 12:14 am
YUL
-
STL
12h 44m
1 stop
$524American Airlines
Sat, Jul 4 - Mon, Jul 13
Multiple Airlines Logo
5:06 pm - 6:15 pm
STL
-
YUL
24h 09m
2 stops
Multiple Airlines Logo
6:47 pm - 9:43 am
YUL
-
STL
15h 56m
1 stop
$526Multiple Airlines
Wed, Sep 16 - Wed, Sep 23
American Airlines Logo
5:00 am - 4:53 pm
STL
-
YUL
10h 53m
1 stop
American Airlines Logo
12:31 pm - 8:44 pm
YUL
-
STL
9h 13m
1 stop
$532American Airlines
Sat, Jul 4 - Mon, Jul 13
Multiple Airlines Logo
5:06 pm - 6:15 pm
STL
-
YUL
24h 09m
2 stops
Multiple Airlines Logo
6:47 pm - 11:53 pm
YUL
-
STL
6h 06m
1 stop
$533Multiple Airlines
Mon, Jul 13 - Wed, Jul 15
Multiple Airlines Logo
4:57 pm - 6:15 pm
STL
-
YUL
24h 18m
2 stops
Multiple Airlines Logo
6:47 pm - 11:53 pm
YUL
-
STL
6h 06m
1 stop
$540Multiple Airlines
Tue, Jun 30 - Tue, Jul 7
American Airlines Logo
2:26 pm - 9:50 am
STL
-
YUL
18h 24m
1 stop
American Airlines Logo
12:30 pm - 12:16 am
YUL
-
STL
12h 46m
1 stop
$547American 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 October.

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 Wednesday and more expensive on a Friday. On your return trip to St. Louis, you should consider flying back on a Thursday, and avoid Tuesdays 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 February, where tickets cost $0 (return) on average. On the other hand, the most expensive months are October and June, where the average cost of round-trip tickets is $909 and $751 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 $594, 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.
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 seasonAugust
Cheapest flight$206
Best time to beat the crowds with an average 33% drop in price.
Most popular time to fly and prices are also 33% 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 5 days, the lowest price for a flight from St. Louis to Montreal Pierre Elliott Trudeau Intl Airport was $189 for a one-way ticket and $427 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?

    Air Canada, Lufthansa, Japan Airlines, 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?

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

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

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

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

    The two airlines most popular with KAYAK users for flights from St. Louis to Montreal are United Airlines and Air Canada. With an average price for the route of $759 and an overall rating of 7.4, United Airlines is the most popular choice. Air Canada is also a great choice for the route, with an average price of $647 and an overall rating of 7.1.

  • 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 $462 or less one-way and $975 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 3 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.
7.4
United AirlinesOverall score based on 9830 reviews
8.1Crew
6.6Food
7.3Comfort
7.7Boarding
7.1Entertainment
Airline reviews

The entertainment they offer could use some games, and maybe they could add some cookies to the snack menu. And the automated messages are a bit repetitive. But it was comfortable temperature wise and the seats were comfortable. The crew is very polite and helpful

6.0 GoodAnonymous, Jun 2026
DEN - YEG
Read more United Airlines reviews

The entertainment they offer could use some games, and maybe they could add some cookies to the snack menu. And the automated messages are a bit repetitive. But it was comfortable temperature wise and the seats were comfortable. The crew is very polite and helpful

I felt scammed. The priced advertised was different than what I paid. I paid the whole some online. I then got a call 20 minutes later saying I need to paid 70 more person. She said the price online is not the guaranteed price.

Some crew were unfriendly or in some cases just straight up rude.

Putting people that close to the bathroom, where you have to look into the bathroom as people are exiting and entering was not great and the smell was also not great. I know the airlines are desperate for more chairs, but that seat is a crime.

one staffer was frustrated (it happen); the flight was late and the pilot mentioned they'll make amend but the snacks were the same, other than that the aircraft was clean and everything went smooth, no complaints

ticket agent lady wás very helpful , she arranged wheel chair for my elderly mother

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.

Crew were professional and kind. The flight was smooth. But... The internet, which we paid 35 dollars for, did not work for most of the flight. This made providing media for our child an uncomfortable hassle.

Overall fine. Seemed like one of the older model planes? Crew was mostly very kind, though some of the female attendants were a rather abrupt during the food service.

Awfully rude American worker at door when we started boarding flight. Then, walk into a blazing hot airplane with no air conditioning until twenty minutes into the flight. Free entertainment was non existent! My husband, along with the fellow passenger in our row, and I could not get entertainment to work, no WIFI! Really?? Been flying American a long time. Was very disappointed.

Flight was delayed by 6 hours... the level of incompetence was truly astounding. I won't be flying American Airlines again. I don't care if AA is direct and there is a layover with another airline, I'll take the layover.

Leave on time. We waited on the plane for hour hours and it was hot and smelly

Two hours delay, probably one hour because they didn’t bring catering and they had to bring water in board. There a change of aircraft. But delays galore at CLT so it must be a CLT and/or AA operation issue. The 1 hr additional delays because nobody could bring 2 packs of water sooner is probably the best example of this airline operates

Flight was delayed 5 hours. Initial reason for delay was 'maintenance' - which makes sense. Then, the additional 2 hours continued to say it was maintenance - when I know EWR had a 2 hour delay. AA did not say that. Additionally, when boarding, there was only one agent at the counter for a long time - until another came to help. After boarding, we had to wait another 45 minutes due to 'no catering'. So while we waited for catering, AA continued to board additional passengers - which seemed odd - and raised questions about what really was going on. I sat in First Class. During the flight, the flight crew allowed a significant number of non-First Class passengers to use the front bathroom - which created a very crowded environment in First Class which was uncomfortable. This also delayed First Class passengers from using the bathroom. Overall, horrible experience.

The Charleston, WV airport was cute. Very good staff and small enough to feel comfortable. The plane had more leg room than bigger planes. Much more comfortable.

Another uncoordinated American experience. Always surprises me at DFW for them of all places. Have to take this flight as there are no other good time options. We knew from the start that something was wrong, but the pilot wouldn't tell us. I just watched my Kayak app grow the delay by 10 minutes as it went to 3.5 hours. They were uncoordinated with maintenance (as maintenance, when finally arriving, knew within 15 minutes the plane wasn't going. No 'sorry' or 'this is what is going on' comment. The pilot seemed unfazed / didn't care about the process we were going through.

The seats. The seat in front of me was awful and when the guy sat down, it flew back and hit my head when I was putting my backpack under the seat, It didn't make for a pleasant experience,

1didnt have wheel chair I ordered wheel chair in my ticket flight

Didn’t make it on the flight. Delayed then had to be rebooked, which in turn had me waiting at the airport for another 8 hours before next flight

The flight was comfortable and the staff were helpful and friendly. However, we did not know we were flying PAL until we arrived in Canada, so it was a bit disconcerting. In addition, which port we were leaving from was confusing.

I bought a ticket from Kayak. When I got to the airport, the was no ticket. I had to pay 5X to get to my destination. No response received from Kayak. I will NEVER use them again.

My wallet was stolen while I was sleeping on the plane.

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.

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

Information on your arrival and departure airports