STL

C$ 201 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 11/1. 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$ 304
Typical prices: C$ 608-C$ 837
Multiple Airlines
Tue 3/2Sun 8/2
YYZ - STL • 1 stop
Cheapest direct flights
C$ 468
Typical prices: C$ 575-C$ 757
Air Canada
Thu 8/1Sun 11/1
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, 3 Feb - Sun, 8 Feb
Multiple Airlines Logo
7:15 a.m. - 11:33 p.m.
YYZ
-
STL
17h 18m1 stop
Multiple Airlines Logo
8:59 a.m. - 2:20 p.m.
STL
-
YYZ
28h 21m1 stop
C$ 304Multiple Airlines
Tue, 3 Feb - Sun, 8 Feb
Multiple Airlines Logo
3:40 p.m. - 6:51 a.m.
YYZ
-
STL
16h 11m2 stops
Multiple Airlines Logo
8:59 a.m. - 2:20 p.m.
STL
-
YYZ
28h 21m1 stop
C$ 319Multiple Airlines
Thu, 8 Jan - Sun, 11 Jan
Multiple Airlines Logo
8:00 p.m. - 12:12 p.m.
YYZ
-
STL
17h 12m1 stop
Multiple Airlines Logo
12:37 p.m. - 7:00 a.m.
STL
-
YYZ
17h 23m2 stops
C$ 347Multiple Airlines
Wed, 14 Jan - Wed, 21 Jan
Multiple Airlines Logo
1:30 p.m. - 12:40 p.m.
YYZ
-
STL
24h 10m2 stops
Multiple Airlines Logo
5:42 p.m. - 12:11 a.m.
STL
-
YYZ
29h 29m1 stop
C$ 350Multiple Airlines
Thu, 8 Jan - Mon, 12 Jan
United Airlines Logo
9:45 a.m. - 10:58 p.m.
YOW
-
STL
14h 13m2 stops
United Airlines Logo
3:11 p.m. - 9:18 p.m.
STL
-
YOW
5h 07m1 stop
C$ 418United Airlines
Fri, 20 Feb - Mon, 23 Feb
American Airlines Logo
3:55 p.m. - 9:34 a.m.
YUL
-
STL
18h 39m1 stop
American Airlines Logo
6:00 a.m. - 3:05 p.m.
STL
-
YUL
8h 05m1 stop
C$ 465American Airlines
Thu, 8 Jan - Mon, 12 Jan
United Airlines Logo
6:00 a.m. - 2:30 p.m.
YOW
-
STL
9h 30m2 stops
United Airlines Logo
8:30 a.m. - 9:18 p.m.
STL
-
YOW
11h 48m2 stops
C$ 501United Airlines
Fri, 20 Feb - Mon, 23 Feb
American Airlines Logo
3:55 p.m. - 9:34 a.m.
YUL
-
STL
18h 39m1 stop
American Airlines Logo
6:33 p.m. - 3:10 p.m.
STL
-
YUL
19h 37m1 stop
C$ 636American Airlines
Fri, 30 Jan - Mon, 2 Feb
Delta Logo
7:30 p.m. - 12:36 p.m.
YUL
-
STL
18h 06m1 stop
Delta Logo
5:56 p.m. - 11:12 p.m.
STL
-
YUL
4h 16m1 stop
C$ 683Delta
Fri, 30 Jan - Mon, 2 Feb
Delta Logo
7:30 p.m. - 12:36 p.m.
YUL
-
STL
18h 06m1 stop
Delta Logo
5:56 p.m. - 11:12 p.m.
STL
-
YUL
4h 16m1 stop
C$ 692Delta
Useful Info

Good to know

Low seasonNovember
Cheapest flightC$ 201
Best time to beat the crowds (4% less expensive on average)
Most popular time to fly and prices are also 20% 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
Fairview Heights
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)