STL

C$ 200 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 4/3. 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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Everything you should know

Cheapest round-trip
C$ 349
Typical prices: C$ 577-C$ 772
Multiple Airlines
Tue 24/2Sat 28/2
YYZ - STL • 1 stop
Cheapest direct flights
C$ 572
Typical prices: C$ 486-C$ 868
Air Canada
Thu 12/2Mon 16/2
YYZ - STL • Direct
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Flight Deals
Useful Info
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, 24 Feb - Sat, 28 Feb
Multiple Airlines Logo
7:15 a.m. - 10:27 p.m.
YYZ
-
STL
16h 12m
1 stop
Multiple Airlines Logo
2:51 p.m. - 6:43 a.m.
STL
-
YYZ
38h 52m
2 stops
C$ 349Multiple Airlines
Tue, 24 Feb - Sat, 28 Feb
Multiple Airlines Logo
7:15 a.m. - 10:27 p.m.
YYZ
-
STL
16h 12m
1 stop
Multiple Airlines Logo
6:41 p.m. - 6:20 a.m.
STL
-
YYZ
10h 39m
1 stop
C$ 382Multiple Airlines
Thu, 9 Apr - Sat, 11 Apr
United Airlines Logo
5:20 p.m. - 10:56 p.m.
YOW
-
STL
6h 36m
1 stop
United Airlines Logo
7:45 a.m. - 1:59 p.m.
STL
-
YOW
5h 14m
1 stop
C$ 436United Airlines
Tue, 24 Feb - Sat, 28 Feb
American Airlines Logo
1:10 p.m. - 9:12 p.m.
YYZ
-
STL
9h 02m
1 stop
American Airlines Logo
10:43 a.m. - 9:29 p.m.
STL
-
YYZ
9h 46m
1 stop
C$ 459American Airlines
Tue, 24 Feb - Sat, 28 Feb
American Airlines Logo
4:44 p.m. - 11:48 p.m.
YYZ
-
STL
8h 04m
1 stop
American Airlines Logo
10:43 a.m. - 9:29 p.m.
STL
-
YYZ
9h 46m
1 stop
C$ 461American Airlines
Thu, 26 Feb - Fri, 27 Feb
United Airlines Logo
5:11 p.m. - 10:59 p.m.
YOW
-
STL
6h 48m
1 stop
United Airlines Logo
7:41 a.m. - 9:18 p.m.
STL
-
YOW
12h 37m
1 stop
C$ 471United Airlines
Thu, 26 Feb - Fri, 27 Feb
Air Canada Logo
7:15 a.m. - 3:29 p.m.
YOW
-
STL
9h 14m
1 stop
Air Canada Logo
4:05 p.m. - 11:18 p.m.
STL
-
YOW
6h 13m
1 stop
C$ 536Air Canada
Thu, 26 Feb - Fri, 27 Feb
Air Canada Logo
7:15 a.m. - 3:29 p.m.
YOW
-
STL
9h 14m
1 stop
Air Canada Logo
4:05 p.m. - 11:18 p.m.
STL
-
YOW
6h 13m
1 stop
C$ 538Air Canada
Thu, 26 Mar - Mon, 30 Mar
Delta Logo
7:00 a.m. - 11:48 a.m.
YUL
-
STL
5h 48m
1 stop
Delta Logo
5:59 p.m. - 11:13 p.m.
STL
-
YUL
4h 14m
1 stop
C$ 645Delta
Thu, 26 Mar - Mon, 30 Mar
Delta Logo
7:00 a.m. - 11:48 a.m.
YUL
-
STL
5h 48m
1 stop
Delta Logo
1:39 p.m. - 11:13 p.m.
STL
-
YUL
8h 34m
1 stop
C$ 646Delta
Useful Info

Good to know

Low seasonNovember
Cheapest flightC$ 200
Best time to beat the crowds (7% 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
Clayton
Eureka
Wentzville
Edwardsville
Farmington
Glencoe
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)