$181 Find Cheap Flights from Ontario to St. Louis - Compare and Save

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 9/16. 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

Thu, Sep 17 - Mon, Sep 21
American Airlines Logo
1:15 pm - 8:44 pm
YYZ
-
STL
8h 29m
1 stop
American Airlines Logo
7:21 am - 6:35 pm
STL
-
YYZ
10h 14m
1 stop
$324American Airlines
Mon, Sep 14 - Mon, Sep 21
American Airlines Logo
3:13 pm - 12:27 am
YYZ
-
STL
10h 14m
1 stop
American Airlines Logo
7:21 am - 6:35 pm
STL
-
YYZ
10h 14m
1 stop
$324American Airlines
Mon, Sep 14 - Mon, Sep 21
American Airlines Logo
6:30 am - 4:48 pm
YYZ
-
STL
11h 18m
1 stop
American Airlines Logo
7:21 am - 6:35 pm
STL
-
YYZ
10h 14m
1 stop
$324American Airlines
Tue, Sep 8 - Fri, Sep 11
American Airlines Logo
1:15 pm - 12:14 am
YYZ
-
STL
11h 59m
1 stop
American Airlines Logo
5:00 am - 2:32 pm
STL
-
YYZ
8h 32m
1 stop
$329American Airlines
Tue, Sep 8 - Fri, Sep 11
American Airlines Logo
3:14 pm - 12:14 am
YYZ
-
STL
10h 00m
1 stop
American Airlines Logo
7:21 am - 6:35 pm
STL
-
YYZ
10h 14m
1 stop
$329American Airlines
Thu, Sep 10 - Thu, Sep 17
American Airlines Logo
6:30 am - 1:16 pm
YYZ
-
STL
7h 46m
1 stop
American Airlines Logo
5:00 am - 2:32 pm
STL
-
YYZ
8h 32m
1 stop
$334American Airlines
Thu, Sep 17 - Mon, Sep 21
American Airlines Logo
6:30 am - 1:16 pm
YYZ
-
STL
7h 46m
1 stop
American Airlines Logo
7:21 am - 6:35 pm
STL
-
YYZ
10h 14m
1 stop
$335American Airlines
Mon, Aug 31 - Wed, Sep 2
American Airlines Logo
3:14 pm - 12:14 am
YYZ
-
STL
10h 00m
1 stop
American Airlines Logo
6:00 am - 2:33 pm
STL
-
YYZ
7h 33m
1 stop
$354American Airlines
Fri, Oct 23 - Mon, Oct 26
Air Canada Logo
2:35 pm - 6:41 pm
YOW
-
STL
5h 06m
1 stop
Air Canada Logo
4:05 pm - 9:50 pm
STL
-
YOW
4h 45m
1 stop
$466Air Canada
Fri, Aug 14 - Sat, Aug 22
Air Canada Logo
9:00 am - 2:04 pm
YOW
-
STL
6h 04m
1 stop
Air Canada Logo
12:10 pm - 7:45 pm
STL
-
YOW
6h 35m
1 stop
$467Air Canada
Useful Info

Good to know

Low season

January

Cheapest flight

$181
Best time to beat the crowds with an average 20% drop in price.
Most popular time to fly with an average 68% increase in price.
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.

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)