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.

$189 CHEAP FLIGHTS from Ontario to St. Louis

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Flight Deals

Cheap Flights from Ontario to St. Louis

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

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

Fri, Dec 11 - Fri, Dec 18

11:36 am - 7:58 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

9h 22m1 stop Chicago O'Hare Intl

6:00 am - 5:40 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

10h 40m1 stop Chicago O'Hare Intl

$342American Airlines

Thu, Dec 17 - Thu, Dec 31

1:20 pm - 10:32 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

10h 12m1 stop Chicago O'Hare Intl

6:00 am - 2:44 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

7h 44m1 stop Chicago O'Hare Intl

$342American Airlines

Thu, Dec 10 - Tue, Dec 15

1:40 pm - 10:57 amYYZ Toronto Pearson Intl-STL Lambert-St Louis

22h 17m2 stops Austin Bergstrom Denver Intl

6:20 pm - 1:40 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

18h 20m1 stop Orlando

$375Multiple Airlines

Thu, Dec 10 - Tue, Dec 15

6:30 am - 12:12 amYYZ Toronto Pearson Intl-STL Lambert-St Louis

18h 42m1 stop Orlando

6:20 pm - 1:40 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

18h 20m1 stop Orlando

$384Multiple Airlines

Thu, Dec 17 - Tue, Jan 5

3:35 pm - 11:38 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

9h 03m1 stop Chicago O'Hare Intl

9:05 am - 7:10 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

9h 05m1 stop Chicago O'Hare Intl

$574United Airlines

Wed, Dec 16 - Tue, Jan 5

8:35 am - 5:05 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

9h 30m1 stop Chicago O'Hare Intl

8:15 am - 7:10 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

9h 55m1 stop Chicago O'Hare Intl

$574United Airlines

Wed, Dec 16 - Fri, Jan 8

6:45 am - 2:41 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

8h 56m1 stop Chicago O'Hare Intl

8:15 am - 6:45 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

9h 30m1 stop Chicago O'Hare Intl

$574United Airlines

Thu, Nov 19 - Sun, Nov 22

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

$646Air Canada

Tue, Dec 29 - Mon, Jan 4

10:05 am - 3:26 pmYOW Ottawa-STL Lambert-St Louis

6h 21m1 stop Toronto Pearson Intl

4:05 pm - 10:55 pmSTL Lambert-St Louis-YOW Ottawa

5h 50m1 stop Toronto Pearson Intl

$657Air Canada

Tue, Dec 1 - Tue, Dec 8

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

$659Air Canada

Recent last minute flight deals from Ontario to St. Louis

Sat, Oct 31 - Wed, Nov 4

6:30 am - 11:16 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

17h 46m1 stop Orlando

4:18 pm - 1:40 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

44h 22m2 stops Denver Intl Orlando

$670Multiple Airlines

Sun, Nov 1 - Thu, Nov 5

1:00 pm - 1:31 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

25h 31m2 stops Nashville Intl Jonesboro

4:26 pm - 1:40 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

20h 14m1 stop Orlando

$697Multiple Airlines

Sun, Nov 1 - Wed, Nov 4

6:30 am - 11:16 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

17h 46m1 stop Orlando

4:18 pm - 1:40 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

44h 22m2 stops Denver Intl Orlando

$702Multiple Airlines

Mon, Nov 2 - Fri, Nov 6

6:30 am - 5:40 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

12h 10m2 stops Orlando Atlanta Hartsfield-Jackson

2:00 pm - 1:40 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

22h 40m3 stops Jonesboro Nashville Intl Orlando

$706Multiple Airlines

Thu, Nov 5 - Sun, Nov 15

6:15 am - 2:34 pmYOW Ottawa-STL Lambert-St Louis

9h 19m1 stop Chicago O'Hare Intl

4:05 pm - 1:40 amSTL Lambert-St Louis-YOW Ottawa

8h 35m1 stop Toronto Pearson Intl

$852Air Canada

Wed, Nov 4 - Tue, Nov 10

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

4:05 pm - 6:59 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mnonstop

$853Air Canada

Wed, Nov 4 - Wed, Nov 11

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

4:05 pm - 6:59 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mnonstop

$867Air Canada

Wed, Nov 4 - Wed, Nov 11

10:30 am - 4:17 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

6h 47m1 stop Newark

4:05 pm - 6:59 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mnonstop

$875United Airlines

Wed, Nov 4 - Tue, Nov 10

10:30 am - 4:17 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

6h 47m1 stop Newark

8:00 am - 4:37 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

7h 37m2 stops Washington, D.C. Dulles Intl New York LaGuardia

$881United Airlines

Thu, Nov 5 - Sun, Nov 15

4:46 pm - 9:40 pmYOW Ottawa-STL Lambert-St Louis

5h 54m1 stop Chicago O'Hare Intl

8:00 am - 3:07 pmSTL Lambert-St Louis-YOW Ottawa

6h 07m1 stop Washington, D.C. Dulles Intl

$891United Airlines

Recent direct flight deals from Ontario to St. Louis

Thu, Nov 19 - Sun, Nov 22

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

$646Air Canada

Tue, Dec 1 - Tue, Dec 8

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

$659Air Canada

Tue, Dec 8 - Sat, Dec 12

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

$659Air Canada

Sun, Nov 22 - Mon, Nov 30

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

$659Air Canada

Thu, Dec 17 - Sat, Jan 2

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

$955United Airlines

Tue, Dec 15 - Sat, Jan 2

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

$955United Airlines

Fri, Dec 18 - Sat, Jan 2

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

$955United Airlines

Sun, Dec 20 - Sat, Jan 2

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

$955United Airlines

Sun, Nov 29 - Sat, Dec 5

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

$1,080Multiple Airlines

Tue, Nov 10 - Fri, Nov 13

2:10 pm - 3:23 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 13mnonstop

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

$1,410Multiple Airlines

Useful Info

Low season	November
High season	March
Cheapest flight	$189

Best time to beat the crowds with an average 4% drop in price.

Most popular time to fly with an average 58% increase in price.

Flight from Toronto 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.