STL

C$ 228 Find Cheap Flights from Ontario 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 7/12. 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

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Flight Deals

Cheap Flights from Ontario to St. Louis

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario 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 Ontario to St. Louis

Tue, 3 Feb - Wed, 4 Feb
Air Canada Logo
9:15 a.m. - 3:29 p.m.YOW-STL
7h 14m1 stop
Air Canada Logo
4:05 p.m. - 11:08 p.m.STL-YOW
6h 03m1 stop
C$ 413Air Canada
Find Deal
Fri, 23 Jan - Sun, 25 Jan
United Airlines Logo
2:15 p.m. - 7:27 p.m.YOW-STL
6h 12m1 stop
United Airlines Logo
7:00 a.m. - 1:32 p.m.STL-YOW
5h 32m1 stop
C$ 420United Airlines
Find Deal
Wed, 21 Jan - Sat, 24 Jan
American Airlines Logo
11:30 a.m. - 6:14 p.m.YYZ-STL
7h 44m1 stop
American Airlines Logo
6:43 p.m. - 10:53 a.m.STL-YYZ
15h 10m1 stop
C$ 423American Airlines
Find Deal
Tue, 24 Feb - Sat, 28 Feb
American Airlines Logo
6:00 a.m. - 1:49 p.m.YYZ-STL
8h 49m1 stop
American Airlines Logo
10:03 a.m. - 9:29 p.m.STL-YYZ
10h 26m1 stop
C$ 425American Airlines
Find Deal
Sat, 20 Dec - Mon, 5 Jan
Multiple Airlines Logo
3:10 p.m. - 11:33 p.m.YOW-STL
9h 23m1 stop
Multiple Airlines Logo
4:05 p.m. - 11:08 p.m.STL-YOW
6h 03m1 stop
C$ 429Multiple Airlines
Find Deal
Fri, 5 Dec - Sun, 14 Dec
Multiple Airlines Logo
12:50 p.m. - 10:33 p.m.YYZ-STL
10h 43m1 stop
Multiple Airlines Logo
9:54 a.m. - 11:43 a.m.STL-YYZ
24h 49m1 stop
C$ 445Multiple Airlines
Find Deal
Tue, 25 Nov - Fri, 28 Nov
Delta Logo
6:05 a.m. - 9:46 a.m.YYZ-STL
4h 41m1 stop
Delta Logo
6:40 a.m. - 11:24 a.m.STL-YYZ
3h 44m1 stop
C$ 538Delta
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Sun, 16 Nov - Thu, 20 Nov
Delta Logo
6:10 p.m. - 11:44 p.m.YYZ-STL
6h 34m1 stop
Delta Logo
6:40 a.m. - 11:25 a.m.STL-YYZ
3h 45m1 stop
C$ 585Delta
Find Deal
Fri, 26 Dec - Thu, 8 Jan
WestJet Logo
5:10 p.m. - 10:16 p.m.YYZ-STL
6h 06m1 stop
WestJet Logo
6:10 a.m. - 3:53 p.m.STL-YYZ
8h 43m2 stops
C$ 732WestJet
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Tue, 25 Nov - Fri, 28 Nov
WestJet Logo
6:05 a.m. - 5:09 p.m.YYZ-STL
12h 04m1 stop
WestJet Logo
6:00 a.m. - 11:39 p.m.STL-YYZ
16h 39m2 stops
C$ 748WestJet
Find Deal

Everything you should know

Cheapest round-trip
C$ 413
Overall average: C$ 881
Air Canada
Tue 3/2Wed 4/2
YOW - STL • 1 stop
Cheapest direct flights
C$ 519
Typical prices: C$ 672-C$ 852
Air Canada
Fri 19/12Sun 4/1
YYZ - STL • Direct
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KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to St. Louis!
Useful Info

Good to know

Low seasonSeptember
Cheapest flightC$ 228
Best time to beat the crowds (4% less expensive on average)
Most popular time to fly and prices are also 22% lower on average.
Flight from Toronto to St. Louis

FAQs for booking flights from Ontario to St. Louis

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

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

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

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

Travelling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Collinsville
Chesterfield
St. Charles
Maryland Heights
Eureka
Wentzville
Edwardsville
Farmington
Glencoe
Fairview Heights
Clayton
O'Fallon
Shrewsbury

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

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

St. Louis (STL)

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