YUL - STL

$226 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 5/6. 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

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
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Flights Deals
Expert advice
Useful Info
Flights Deals

Cheap Flights from Montreal to St. Louis

 
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.

Recent round-trip flight deals from Montreal to St. Louis

KAYAK's recommended round-trip deals from the most popular airlines that fly from Montreal to St. Louis.
Discover the best prices for you by selecting your travel dates on KAYAK.
Delta Logo
11:00 am - 8:57 pmYUL-STL
10h 57m1 stop
Delta Logo
9:16 am - 6:53 pmSTL-YUL
8h 37m1 stop
$468Delta
Find Deal
Wed, Jul 23 - Sat, Jul 26
Air Canada Logo
6:00 am - 12:36 pmYUL-STL
7h 36m1 stop
Air Canada Logo
1:30 pm - 5:00 pmSTL-YUL
2h 30mnonstop
$506Air Canada
Find Deal
Tue, Jun 17 - Sun, Jun 22
United Airlines Logo
8:10 am - 3:30 pmYUL-STL
8h 20m2 stops
United Airlines Logo
5:00 am - 10:40 amSTL-YUL
4h 40m1 stop
$507United Airlines
Find Deal
Tue, Jun 17 - Sun, Jun 22
Delta Logo
5:00 pm - 8:10 amYUL-STL
16h 10m1 stop
Delta Logo
6:00 am - 4:07 pmSTL-YUL
9h 07m1 stop
$508Delta
Find Deal
Thu, Jul 24 - Sun, Jul 27
Air Canada Logo
6:10 pm - 7:58 pmYUL-STL
2h 48mnonstop
Air Canada Logo
9:50 am - 5:26 pmSTL-YUL
6h 36m1 stop
$532Air Canada
Find Deal
Fri, May 23 - Mon, May 26
Air Canada Logo
9:45 am - 3:30 pmYUL-STL
6h 45m1 stop
Air Canada Logo
9:50 am - 5:26 pmSTL-YUL
6h 36m1 stop
$537Air Canada
Find Deal
Fri, May 23 - Mon, May 26
United Airlines Logo
6:10 pm - 9:56 amYUL-STL
16h 46m2 stops
United Airlines Logo
5:20 am - 11:26 pmSTL-YUL
17h 06m1 stop
$569United Airlines
Find Deal
Fri, May 23 - Mon, May 26
American Airlines Logo
12:30 pm - 11:49 pmYUL-STL
12h 19m1 stop
American Airlines Logo
6:00 am - 4:40 pmSTL-YUL
9h 40m1 stop
$641American Airlines
Find Deal
Thu, Sep 25 - Mon, Sep 29
WestJet Logo
6:45 am - 4:35 pmYUL-STL
10h 50m2 stops
WestJet Logo
1:09 pm - 12:37 amSTL-YUL
10h 28m2 stops
$648WestJet
Find Deal
Fri, May 23 - Mon, May 26
American Airlines Logo
10:37 am - 6:14 pmYUL-STL
8h 37m2 stops
American Airlines Logo
6:00 am - 4:40 pmSTL-YUL
9h 40m1 stop
$668American Airlines
Find Deal
Thu, Sep 25 - Mon, Sep 29
Expert advice

Expert advice for your flight from Montreal to St. Louis

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
United Airlines

United's Economy Plus offers up to six inches more legroom than standard economy seats.


United's Priority Boarding places you in Zone 2, avoiding overhead bin space issues.

Air Canada

Air Canada's Preferred Economy offers up to four extra inches of legroom for a fee.


Air Canada's Wi-Fi availability can be checked online five days before your flight.

Read more about Air Canadaby Stefanie Waldek
Airports
YUL

For US flights, pre-clearance at YUL means completing customs before departure. Arrive early to allow extra time for this process.

Read more about YULby Brandon Schultz
STL

Use MetroLink for easy access to downtown St. Louis from STL. The Red Line connects the airport to key city areas.

Read more about STLby Yulia Denisyuk
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on United Airlines and Air Canada

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
Useful Info

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 Tuesday, and avoid Saturdays 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 August, where tickets cost $440 (return) on average. On the other hand, the most expensive months are December and October, where the average cost of round-trip tickets is $731 and $625 respectively.

Good to know

Low seasonAugust
High seasonMay
Cheapest flight$226
Best time to beat the crowds with an average 20% drop in price.
Most popular time to fly and prices are also 17% 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 3 days, the lowest price for a flight from Montreal Pierre Elliott Trudeau Intl Airport to St. Louis was $226 for a one-way ticket and $468 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 Canadair (Bombardier) Regional Jet 900 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 nonstop flights from Montreal to St. Louis on a daily basis.

  • 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 $511 and an overall rating of 8.0, Delta is the most popular choice. Air Canada is also a great choice for the route, with an average price of $546 and an overall rating of 7.0.

  • 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.

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

  • Looking for a cheap flight? 25% of our users found flights on this route for $256 or less round-trip.

Prefer to fly direct from Montreal to 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, United Airlines

Air Canada, United Airlines

Tuesday

Air Canada, United Airlines

Air Canada, United Airlines

Wednesday

Air Canada, United Airlines

Air Canada, United Airlines

Thursday

Air Canada, United Airlines

Air Canada, United Airlines

Friday

Air Canada, United Airlines

Air Canada, United Airlines

Saturday

Air Canada, United Airlines

Air Canada, United Airlines

Sunday

Air Canada, United Airlines

Air Canada, United Airlines

See more direct flights

Direct returns

Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl

Monday

Air Canada, United Airlines

Air Canada, United Airlines

Tuesday

Air Canada, United Airlines

Air Canada, United Airlines

Wednesday

Air Canada, United Airlines

Air Canada, United Airlines

Thursday

Air Canada, United Airlines

Air Canada, United Airlines

Friday

Air Canada, United Airlines

Air Canada, United Airlines

Saturday

Air Canada, United Airlines

Air Canada, United Airlines

Sunday

Air Canada, United Airlines

Air Canada, United Airlines

See more direct flights
See more direct flights

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.
8.0
DeltaOverall score based on 7936 reviews
7.9Comfort
8.2Boarding
7.3Food
8.5Crew
7.9Entertainment
Airline reviews

Fine except the person next to me took up her seat had raised the arm divide so she spilled into my seat. because of her size. Fortunately no one was in the seat on my right so I could use part of it.

10.0 ExcellentAnonymous, Apr 2025AMS - ATL
Read more Delta reviews

Fine except the person next to me took up her seat had raised the arm divide so she spilled into my seat. because of her size. Fortunately no one was in the seat on my right so I could use part of it.

Delta is my preferred airline. I've traveled with them for years. On time in most cases, good communication, easy to use app. Most planes are pretty nice. I was on a CRJ 700/900 however, which was pretty badly aged inside and needed a refresh. No infotainment, unreliable wifi, best to download before boarding or bring a book. Food choices are really just snacks on this flight, nice variety but about what you'd expect. Great staff and prompt in departure and early arrival too. Overall quite satisfied.

Crew was friendly Love the entertainment in the seat head rest.

Delta flight was on time, seats were comfortable, and crew was nice.

This had nothing to do with Delta… The flights were on time and flawless. The service was excellent. We purchased seats in (aisle/middle) comfort plus since this was a cross country flight. Unfortunately, the woman seated at the window was 300+ pounds and, as might be expected, covered up about a third of the middle seat also. there was absolutely nothing that Delta could have done about that… I just don’t know what the answer should be. If you purchase a seat, you should should be able to use the entire seat and not just the portion that someone else is not sitting/oozing in. Disappointing…there should be something that could be done….I'm just not sure what solution could be.

Delayed take-off. Very small plane so very scary with lots of bumps during the flight. Would never fly Delta on short flights in small 80 seaters plane again! Felt relieved when landed.

Delta is a cut above the others in customer service.

The worst part was I was NOT allowed in the lounge even though I was holding a first class ticket and have a premium American Express card. I have flown Business or First Class with many airlines. Delta is the ONLY one who does not extend this courtesy to anyone except people who hold the very expensive American Express card. As a result, I won’t fly Delta if I have any other choice.

A little bumpy ride . No food was being provided due the the turbulence. That was ok it was a short flight to my standards.

Simply outstanding. Their new lounge for Delta One customers is a cut above the rest.

Terrible. Flight was delayed for hours and we ended up arriving at our home at 4am after 20+ hours flying.

Flight was cancelled around 45 -1hr minutes before scheduled take off time due to mechanical issues we hadn’t even boarded yet. Had to reroute to Orlando so someone had to drive 2 1/2 to come and get me… the alternative was go through Toronto and get a later flight which didn’t work for my schedule. The flight attendants barely gave anyone a smile…not the same as flying when a client/passenger was important. Very disappointed. By the way I have never ever made a complaint online about any company with feedback…even when I probably should have. The only good experience was the boarding desk associates who were very professional and got me on another flight with my checked bags…very nice team.

Actually as my experience with air Canada from Canada to Newark it was crazy for me because it was a lot of delays which for me it shouldn’t be like that, but I was able to coup with it so that was my experience I hope next time they will do good on that thanks.

Mixed experienced. Nice staff. Spacious 787 better than cramped Airbus, though my seat was broken. The bad: Way overpriced ticket and charged for food despite 6 hr flight.

Very smooth flight and the crew members were very welcoming.

Super. Planes were clean. Flights were on time. boarding was smooth. Flight attendants were professional.

ground crew at Casablanca as well as at Montreal was not helpful at all. specially at Montreal airport, very rude .

The TSA people or whatever you call them were a bit rude- I asked why I had to take my shoes off bc I'm 75 and in the USA, I don't have to. The man didn't need to snap at me. It wasn't even busy! The plane was ok, a bit small for such a long flight, but I'm very familiar with the 737 used ( I fly it often between SFO and SAN) service was ok-nothing special. If I drank alcohol I guess I would be happy with free choices. the plane was HOT and even the FA commented on it. They tried to get it cooler, but it never happened.

I have flown on many airlines all over the world, and this plane flight was the most uncomfortable I have ever experienced.

Flight from Minneapolis to Montreal was easy, breezy. Small plane, so not much overhead space. The seats felt slightly smaller than normal, but not uncomfortable for my body type. No screens in the seats for watching movies or shows, but I don't mind, I'm more of a reader.

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

Information on your arrival and departure airports

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