YUL - STL

C$ 214 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 21/5. 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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Cheap Flight Deals 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.

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.
Choose your dates
 Logo
6:45 a.m. - 12:06 a.m.YUL-STL
18h 21m2 stops
 Logo
5:45 p.m. - 2:20 p.m.STL-YUL
19h 35m1 stop
C$ 434
Find Deal
Tue, 13 May - Wed, 14 May
 Logo
6:45 a.m. - 12:06 a.m.YUL-STL
18h 21m1 stop
 Logo
5:45 p.m. - 2:20 p.m.STL-YUL
19h 35m1 stop
C$ 495
Find Deal
Tue, 13 May - Wed, 14 May
Delta Logo
12:44 p.m. - 6:01 p.m.YUL-STL
6h 17m1 stop
Delta Logo
5:40 p.m. - 11:54 p.m.STL-YUL
5h 14m1 stop
C$ 539Delta
Find Deal
Thu, 22 May - Thu, 29 May
Air Canada Logo
6:10 p.m. - 7:58 p.m.YUL-STL
2h 48mdirect
Air Canada Logo
7:30 a.m. - 1:21 p.m.STL-YUL
4h 51m1 stop
C$ 541Air Canada
Find Deal
Thu, 22 May - Thu, 29 May
 Logo
8:15 a.m. - 9:15 a.m.YUL-STL
26h 00m3 stops
 Logo
10:10 a.m. - 8:42 a.m.STL-YUL
21h 32m2 stops
C$ 546
Find Deal
Sat, 10 May - Thu, 15 May
Air Canada Logo
6:10 p.m. - 7:58 p.m.YUL-STL
2h 48mdirect
Air Canada Logo
7:30 a.m. - 3:21 p.m.STL-YUL
6h 51m1 stop
C$ 572Air Canada
Find Deal
Tue, 13 May - Wed, 14 May
United Airlines Logo
6:00 a.m. - 3:47 p.m.YUL-STL
10h 47m2 stops
United Airlines Logo
6:30 a.m. - 3:50 p.m.STL-YUL
8h 20m2 stops
C$ 702United Airlines
Find Deal
Tue, 13 May - Wed, 14 May
United Airlines Logo
6:00 a.m. - 3:30 p.m.YUL-STL
10h 30m2 stops
United Airlines Logo
6:30 a.m. - 5:26 p.m.STL-YUL
9h 56m1 stop
C$ 729United Airlines
Find Deal
Thu, 22 May - Thu, 29 May
WestJet Logo
6:45 a.m. - 4:35 p.m.YUL-STL
10h 50m2 stops
WestJet Logo
12:30 p.m. - 12:37 a.m.STL-YUL
11h 07m2 stops
C$ 769WestJet
Find Deal
Thu, 22 May - Thu, 29 May
Delta Logo
7:10 a.m. - 1:01 p.m.YUL-STL
6h 51m1 stop
Delta Logo
12:30 p.m. - 9:09 p.m.STL-YUL
7h 39m1 stop
C$ 893Delta
Find Deal
Mon, 5 May - Fri, 9 May

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 specific 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
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
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.

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 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 travels every week and makes friends with stray cats wherever he goes. Dogs, too... he once brought one home to the US from the Amalfi Coast. He’s written 6 books, visited 6 continents (still waiting on Antarctica), and would eat ice cream 6 times a day if he could. He lives in Brooklyn, New York, with his partner and three cats.

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

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 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 C$ 608 (return) on average. On the other hand, the most expensive months are December and October, where the average cost of round-trip tickets is C$ 1,010 and C$ 864 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 C$ 873, prices are generally cheapest when you fly direct.

Good to know

Low season

August

High season

May

Cheapest flight

C$ 214
Best time to beat the crowds (20% less expensive on average)
Most popular time to fly and prices are also 18% 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 C$ 155 for a one-way ticket and C$ 314 for a round-trip.

  • 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?

    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 direct flights from Montreal to St. Louis on a daily basis.

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

    The two airlines most popular with KAYAK users for flights from Montreal to St. Louis are United Airlines and WestJet. With an average price for the route of C$ 748 and an overall rating of 7.4, United Airlines is the most popular choice. WestJet is also a great choice for the route, with an average price of C$ 1,021 and an overall rating of 7.2.

  • 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 travellers 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.

  • 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.

See more FAQs

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 C$ 419 or less one-way and C$ 644 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 nonstop 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 nonstop flights
See more nonstop flights

Top 3 airlines serving 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.
7.4
United AirlinesOverall score based on 8683 reviews
7.1Entertainment
8.1Crew
7.3Comfort
6.6Food
7.7Boarding
Airline reviews

Plane temperature was comfortable (not to hot) when boarding and waiting for takeoff.

8.0 ExcellentAnonymous, Mar 2025YVR - DEN
Read more United Airlines reviews

Plane temperature was comfortable (not to hot) when boarding and waiting for takeoff.

Michael, our FA was very attentive, even finding me a chocolate brownie from economy class when the dessert selections were all dairy based. ( intolerant, not allergic so don’t usually need to order dairy free)

We tried to upgrade to economy premium but were told this was not possible as we had booked through United Airlines (and Air Canada was operating the flight). This seemed silly given there was ample space in economy premium. Additionally, we had to wait almost 1.5 hours upon arrival to taxi to the gate. Otherwise, the crew were very pleasant and passengers were friendly.

It was my first time with United Airlines and I would say it was very good experience and best of all the flights were on time. Will definitely fly with United Airlines next time.

headphone jack didnt work for the first flight and not much variety

Plane 3 hours late. Missed connection. No help from gate staff. App horrible. Lost connection repeatedly. No service desk. Finally got help from young girl driving cart.

Not as good as expected Air Can needs to improve totally rated on internet as worst

The flight was delayed, it took longer than anticipated because of weather, and they broke my luggage.

Short flight - no food understandable. Flight was delayed for over an hour. Overall, it was good.

Everything was good. Flight was on time, luggage pickup was quick. The staff were great. Could not ask for anything more.

Internet on both flights was sketchy. Thus in flight entertainment was non- existent on MN - Balrimote leg.

It took 30 minutes to check in with the Westjet rep. They didn’t have enough seats and she needed to make a call… I am always “randomly” selected to be checked at security. Their “randomly “ selection system may need some updating. They treat people like criminals. It is not appropriate behavior.

Will never book through you again. Very disappointed in the notices and action taken or provided when planes are rescheduled, enough to cause missed connections

Lost my luggage. Filed a report and there is no response. Received a phone call from another airline that said they had the bag and they did not know what to do with it

Very good over all , would have been nice to have entertainment on the flight

Absolutely the worst airline I have ever taken. They lost my baggage and told me my bag tags had been cancelled. When my bags arrived days later I had to pick them up at 3:15 am. My return flight was delayed another 6 hours and they broke my bag. Westjet does nothing to try and make it a better customer experience and all the customers services representatives I spoke with were useless and incompetent. Never flying westjet again.

it's all good nothing you can do make better 😌

Very old planes. Seats were not comfortable. Air was not on during the flight leading to incredibly stuffy conditions.

It was so bad experience they wanted just charged passengers for any reason.

Delta was great. West Jet was not. I booked my flight in Sept (well over two months ago), but was told there were 2 reservations and NO tickets for me, my husband and 16mo daughter. We were unable to go ahold of West Jet over the phone and the kiosk was unhelpful so we had to buy completely new tickets in order to get home that day. I’ve called West Jet twice since and sat on the phone for over an hour without speaking to any representatives.

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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