$138 Find Cheap Flights from Canada 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 to St. Louis departing on 3/4. 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 St. Louis

 
These are the airlines KAYAK users have selected most often from within our search results for flights 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 for flights to St. Louis, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$265
Typical prices: $295-$510
United Airlines
Tue 3/3Wed 3/18
YVR - STL • 2 stops
Cheapest non-stop
$422
Typical prices: $391-$569
Air Canada
Wed 2/25Wed 3/25
YYZ - STL • Non-stop
Top routes
YYZ
-
STL
Cheapest
YUL
-
STL
Most popular
Insights
Insights
Insights
Insights
When to travel
June
Cheapest • 21% price drop
May
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.
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Canada to St. Louis

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Canada 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.
Discover the best prices for you by selecting your travel dates on KAYAK.

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

Tue, Mar 3 - Wed, Mar 18
United Airlines Logo
3:00 pm - 4:58 pm
YVR
-
STL
23h 58m
2 stops
United Airlines Logo
2:50 pm - 11:06 pm
STL
-
YVR
10h 16m
1 stop
$265United Airlines
Wed, Mar 4 - Wed, Mar 11
Multiple Airlines Logo
7:10 am - 10:27 pm
YYZ
-
STL
16h 17m
1 stop
Multiple Airlines Logo
11:32 am - 11:26 am
STL
-
YYZ
22h 54m
2 stops
$267Multiple Airlines
Mon, Apr 20 - Sat, Apr 25
Delta Logo
6:15 am - 12:25 am
YVR
-
STL
16h 10m
2 stops
Delta Logo
6:20 am - 10:50 am
STL
-
YVR
6h 30m
1 stop
$289Delta
Mon, Apr 20 - Sat, Apr 25
Delta Logo
7:30 pm - 9:42 am
YVR
-
STL
12h 12m
2 stops
Delta Logo
6:20 am - 10:50 am
STL
-
YVR
6h 30m
1 stop
$290Delta
Fri, Mar 6 - Tue, Mar 10
Air Canada Logo
9:00 am - 3:29 pm
YHZ
-
STL
8h 29m
1 stop
Air Canada Logo
4:05 pm - 12:51 am
STL
-
YHZ
6h 46m
1 stop
$310Air Canada
Fri, Mar 6 - Tue, Mar 10
Air Canada Logo
9:00 am - 3:29 pm
YHZ
-
STL
8h 29m
1 stop
Air Canada Logo
4:05 pm - 12:51 am
STL
-
YHZ
6h 46m
1 stop
$311Air Canada
Mon, Apr 20 - Sat, Apr 25
American Airlines Logo
12:30 pm - 10:17 pm
YUL
-
STL
10h 47m
1 stop
American Airlines Logo
5:21 pm - 11:44 am
STL
-
YUL
17h 23m
1 stop
$311American Airlines
Mon, Apr 20 - Sat, Apr 25
American Airlines Logo
12:30 pm - 11:46 pm
YUL
-
STL
12h 16m
1 stop
American Airlines Logo
5:21 pm - 11:44 am
STL
-
YUL
17h 23m
1 stop
$349American Airlines
Sun, Mar 1 - Wed, Mar 4
Alaska Airlines Logo
6:09 am - 11:59 pm
YYJ
-
STL
15h 50m
1 stop
Alaska Airlines Logo
7:00 am - 11:43 pm
STL
-
YYJ
18h 43m
1 stop
$431Alaska Airlines
Sat, Feb 28 - Wed, Mar 4
Alaska Airlines Logo
11:37 am - 2:23 pm
YEG
-
STL
25h 46m
1 stop
Alaska Airlines Logo
7:00 am - 10:47 am
STL
-
YEG
28h 47m
1 stop
$451Alaska Airlines
Booking Insights

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

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

What is the cheapest flight to St. Louis?

These are the best round-trip prices found by users searching on KAYAK in the last 72 hours.

In the last 3 days, the lowest price for a flight to St. Louis was $138 for a one-way ticket from Toronto and $265 for a round-trip. The most popular route searched for by our users was for flights from Montreal to St. Louis and the best round-trip deal found in the last 3 days was $311.

What is the cheapest month to fly to St. Louis?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights 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 to St. Louis is May, where tickets cost $435 on average for one-way flights. On the other hand, the most expensive months are December and August, where the average cost of tickets from Canada is $794 and $774 respectively. For return trips, the best month to travel is June with an average price of $365.

What is a good deal for flights to St. Louis?

If you’re looking for cheap airfare to St. Louis, 25% of our users found tickets to St. Louis for the following prices or less: From Toronto Pearson Intl Airport $439 one-way - $394 round-trip.

How far in advance should I book a flight to St. Louis?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights to St. Louis, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 72 days before departure.

Good to know

Low seasonJanuary
Cheapest flight$138
Best time to beat the crowds but there is an average 7% increase in price.
Most popular time to fly and prices are also 6% lower on average.
Flight from Toronto to St. Louis

FAQs - booking St. Louis flights

  • What is the cheapest flight to St. Louis?

    In the last 3 days, the lowest price for a flight to St. Louis was $138 for a one-way ticket from Toronto and $265 for a round-trip. The most popular route searched for by our users was for flights from Montreal to St. Louis and the best round-trip deal found in the last 3 days was $311.

  • How far is Lambert-St Louis Airport from central St. Louis?

    Central St. Louis is 13 miles away from Lambert-St Louis Airport.

  • What is the name of St. Louis’s airport?

    When flying to St. Louis, you'll arrive at Lambert-St Louis Airport (STL). The airport is also known as Lambert Field, Lambert-St Louis, St. Louis Lambert, or St. Louis Lambert Intl.

  • How much is a flight to St. Louis?

    On average, a flight to St. Louis costs $573. The cheapest price found on KAYAK in the last 2 weeks cost $340 and departed from Toronto Pearson Intl Airport.

  • What is the cheapest day to fly to St. Louis?

    Based on KAYAK data, the cheapest day to fly to St. Louis is Tuesday where tickets can be as cheap as $389. On the other hand, the most expensive day to fly is Wednesday, where prices are $483 on average.

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

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to 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 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 with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight 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 up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to St. Louis?

    The cheapest time of day to fly to St. Louis is generally in the morning, when flights cost $326 on average. The most expensive time of day to fly to St. Louis is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $446.

Top tips for finding cheap flights to St. Louis

  • Looking for a cheap flight? 25% of our users found flights on this route for $439 or less one-way and $394 or less round-trip.
  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest St. Louis flight deals.

Reviews of the top 5 airlines serving from Canada to St. Louis

 
See real verified KAYAK customer reviews for airlines flying to St. Louis. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from Canada to St. Louis. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with 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
Alaska AirlinesOverall score based on 11851 reviews
7.1Food
7.8Comfort
7.0Entertainment
8.1Boarding
8.5Crew
Airline reviews

man & woman back side flight attendant was very rude. I live in Seattle. I use a lot of time Alaska flights. I always like them for fact that my favorite airline employees very rude. It’s disappointing. .

6.0 GoodAnonymous, Feb 2026
SEA - EWR
Read more Alaska Airlines reviews

man & woman back side flight attendant was very rude. I live in Seattle. I use a lot of time Alaska flights. I always like them for fact that my favorite airline employees very rude. It’s disappointing. .

The seats were spacious and comfortable. Even in basic economy. However, the flight boarded 30 minutes late.

Kayak wouldn’t refund me for a flight I was trying to cancel through Kayak. Alaska airlines said I had to cancel through Kayak. I called the customer service line and they couldn’t refund the flight that I booked through Kayak either. You stole my money. You will be hearing from my lawyer.

Great experience, staff and crew were very professional, friendly and helpful!

I fell asleep and missed my flight and they rescheduled me no problem. Staff was professional and the plane was clean. I was very happy with my experience.

The room for legs is adequate for a 6’ tall man and the flight was comfortable. The cabin is clean and the crew is very friendly and pleasant.

The he whole flight was very smooth on every aspects.

Flight cancelled and deplaned. Rescheduled 8 hours later at a different airport. Ended up at destination but late.

Alaska used to be a top notch airline. With it's growth it is now in line with the big airlines. Not bad, not great.

I think Alaska should start including free meals on these longer trips.

The flight was great as well as the airline staff

First class and monitors weren’t working for mine & my husbands. Eventually fixed, but quite annoyed as we bought first class. Also, No foot rests.

Prior to takeoff, the pilot told us there was a possibility of not being able to land and going to Portland. Well that happened, we took off and then did 8 loops around Spokane before the pilot told us we ran out of fuel and had to go to Portland. So for a 35 minute flight we have now been on the plane for 3 hours (boarded at 6:50 am and landed in Portland at 10:30). Then, we just sat in Portland's airport with no updates of when we can start heading back. All of a sudden, our pilots and crew just left, leaving us stranded in a different city and state. We continued to sit in Portland until we finally got a new crew assigned and boarded the plane (This was from 10:30-2). We then sat on the plane for an additional hour before take off because they had to count us multiple times. We finally landed in Spokane at 3:55 PM. So a flight that should have taken at max an hour took us 10 hours and we missed the majority of the recruiting event we went for.

It was delayed but other than that it was great.

Got on the plane and sat there for an hour before departure.

Second flight in a row where the entertainment system is broken. 5 hour long flight with no entertainment and flight attendants did not seem interested in resolving the matter. Very shocked to be treated this poorly considering I paid for a first class experience and have Diamond Medallion status.

They double booked seats, the gate staff changed my ticket as I was boarding she went over to the computer and changed it without telling me. She messed up an entire three row section for me and others. Other travelers were outraged but the gate staff were so rude, so condescending saying it wasn't their problem to solve. I would rate this a zero if I could. Will not fly Delta again I'll stick with United and American.

Comfort seating was on the tight side. Maybe it was a smaller plane(?)

I didn't take this flight. I changed the flight. Why am I getting surveys and notifications on flights that I change. Seems like a defect with Kayak.

Delta One is extraordinary. I fly business when somebody hires me. I just wonder why there is such a chasm between business class and the insanely inhumane and nonsensical coach. The seats are not large enough to fit even my tiny wife. We fly 10% of what we did because we don’t want to pay 5-10 k but for $400 it’s unbearable. It seems like the accountants took over and made stupid decisions. Screw in 20 extra seats and make it so unbearable that people fly 90% less. Just put the damn price up and put some proper chairs in. But business, yay.

Very poor. The flight was delayed from Toronto because some forget to do there job . I got to my connecting gate in San Francisco 10 minutes before the departure.but this didn’t let me board even though the flight was still there for an other 30 minutes. The the gentleman at the unite airline desk told me that they usually wait for passengers but air Canada called and told them not to we I been rerouted to Manila instead of Hong Kong . In San Francisco they mad me check in my carryon bag . I was told the it will directly go yo ho chi minn cuyt but I was told that by the Vietnams airline desk that’s not there I’m 10 hours behind my scheduled flight and looks like I I’m going without baggage. I don’t have a chance of catching ..

It was great. There were some issues prior to takeoff. The weather was poor so we had to go through deicing, and we were delayed a bit by the pilots' concern about one of the engines, but that's aviation. The pilots handled everything with aplomb, and kept us apprised

Reliable, nice crew, I fly often on that flight and I like it all.

l really enjoy very much the flight was very pleasant

Essy to get on. The hostess gave very little pop, the plane was late getting in, and we are still waiting for our bags. This sucks. :/

The Sears in the 800s are not too good perfect Airbus why cant the new 737 fix that

Quick and seamless boarding. No entertainment but fast Starlink wifi for this short trip and the staff was really friendly.

I dread trans-Pacific flights. They are very long. This was my first time on Universal, and it was my best crossing ever. The staff were professional, the hospitality was great, and the food was delicious. The entertainment system filled the long flight hours. I will seek out Universal flights from now onwards. 🙂

Lately I like the planes have been exceptionally filthy. There’s lines of dust and dirt all across the ceiling in the vents, and the cracks in between the seats are literally full of food. It’s definitely not the quality of service that I was used to with United. I’m also very disappointed with the Wi-Fi! All I wanna do is knock out a few work jobs while I’m trapped in my seat And it spools so bad. They did provide me with a refund, but the process of getting that refund is so complicated. It’s unfortunate.

Excellent flight. Smooth, efficient boarding. Quick flight. Arrived early at STL.

This was a horrible experience. I’ve experienced several delays at this point and still not home. I was supposed to be home by 8:30 last night and here I sit at 7 am on a plane STILL unable to go home because of American Airlines.

Generally good. Flight left on time and the seats are comfortable. Plenty of space in front if you in you choose a comfort plus seat, completely worth spending the extra money given the amount of hours the flight lasts. The food tastes good but I would say it’s a the amount is too little. The crew was friendly and efficient. There was a some turbulence at different points into the flight. American Airlines has good deals to NZ if you book with plenty of time before you plan on going.

the plane was so hot!! the air-conditioning was barely blowing. The flight was delayed, and we had to sit on the hot plane before take off for an extended amount of time, waiting on international passengers. Would not have been so bad if it was not so hot. They said it would get better after take off, but it did not.

They are always late and seats was also not having working charger

We flew in first class. The crew did not offer drinks before the flight took off, but they treated us well during the flight. The food was excellent. There was actually too much food served, but it was nice to have all the options.

did not have enough meal for first class passengers so offer us snack

Arrived 40 min early which was great - sat in runway for 35 min so no gain. Then waited for luggage 45 min. They need to staff accordingly knowing its one of the busiest week in Phx

My flight got rerouted due to crew rest. I was sent to Dallas customer service was not very polite. Was given a $40 room voucher for Motel 6 and $12 to eat with. It delayed me by a day. Where if I would have just stuck with my original flight Arizona was delayed to Cleveland and I could have made it home. They put me on a 9:00 flight out of Dallas to Cleveland without my knowledge or consent. When originally I was told it would be 8:45 a.m. on February 1st. I told them I could not take the 9:00 flight because I did not have anybody to pick me up from the airport at that time. I'm extremely disappointed in how I was treated. And I will not fly American Airlines again.

I am very appreciative of the help provided to me by Dennis and Whitney. I had lost my phone at EWR airport and they were very kind in assisting me. This included advice on how to file a report and also helping me connect with family. The pilot was also great about keeping passengers updated on the flight progress with regular communications over the system.

Awful. Original flight was delayed 5 hours. Had to to take a connecting flight instead of direct. Had a 4 hour layover. I missed all of my morning meetings getting in 5 hours later than I was supposed to and had to change to take a later flight the next day to get them back in which cia time another $150.

This is a great non-stop YVR-MIA. Very comfortable plane, and no transfer through a city that gets major winter weather!

Terrible…. Reported missing luggage’s with injectable meds that needed refrigeration. Yet, delivery could not be expedited. Luggage’s were delivered 5 days after arrival. The meds were useless as ice pack had melted. So disappointed!!!

Air Canada’s problems are not staff related by and large, no. The problem is tiny jets between the U.S. and Canada - yes, believe it or not they are still “international” (just ask our own Mango Maniac in power in the U.S.). The little aisle is compounded by a design flaw of a “dog leg” starting at seat 12. Woe be unto you if you sit here as passengers and attendants do not have sufficient room to not hit you in the face with backpacks. One thing I will say very positively about Air Canada is you still provide pillows and blankets on transcontinental flights to all, not just the elites. Your tiny improperly designed jets are also a problem flying city to city within Canada also. One can only say you remind us of a “Jet Blue” or “Spirit” experience. Also your luggage space is downright Byzantine! We will endeavor to avoid you and use other U.S. carriers, albeit charging more.

Terrible canceled flight and lost my luggage. Flew me to Halifax. Tgat flight was delayed, had to spend night in airport chair.

My seat was not comfortable. Flight was smooth. Regretfully we had two delays before takeoff

Amazing service, with enthusiastic crew members, and some breathtaking views of Vancouver. No IFE though, as it is only a 1 hour flight on a regional Turboprop jet.

They are very proactive and made our boarding easy and always notified us about any changes well in advance.

My seat was covered in vomit and I will be reaching out to Air Canada

It's kindof ridiculous that your system is even asking me about this since my flight was canceled and I wasn't rescheduled.

3 hr delay at the gate while they were doing maintenance. Next time, do not board passengers while maintenance is being performed

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
O'Fallon
Wentzville
Farmington
Eureka
Litchfield
Grafton
Shrewsbury
Glencoe

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

Information on the airport you'll fly into in St. Louis