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.

$175 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

Sat, Oct 10 - Wed, Oct 14

11:39 am - 12:19 amYYZ Toronto Pearson Intl-STL Lambert-St Louis

13h 40m1 stop Chicago O'Hare Intl

5:00 am - 2:33 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

8h 33m1 stop Chicago O'Hare Intl

$321American Airlines

Sat, Oct 10 - Thu, Oct 15

1:15 pm - 9:13 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

8h 58m1 stop Chicago O'Hare Intl

5:00 am - 2:33 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

8h 33m1 stop Chicago O'Hare Intl

$321American Airlines

Wed, Oct 28 - Sat, Oct 31

11:40 am - 8:57 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

10h 17m1 stop Chicago O'Hare Intl

1:30 pm - 11:29 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

8h 59m1 stop Chicago O'Hare Intl

$322American Airlines

Mon, Oct 26 - Mon, Nov 2

3:14 pm - 12:19 amYYZ Toronto Pearson Intl-STL Lambert-St Louis

10h 05m1 stop Chicago O'Hare Intl

6:00 am - 2:34 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

7h 34m1 stop Chicago O'Hare Intl

$322American Airlines

Sat, Oct 10 - Wed, Oct 14

12:55 pm - 2:00 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mnonstop

2:40 pm - 5:34 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mnonstop

$442Air Canada

Sat, Oct 10 - Thu, Oct 15

12:55 pm - 2:00 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mnonstop

8:55 am - 11:49 amSTL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mnonstop

$442Air Canada

Sat, Oct 10 - Thu, Oct 15

12:55 pm - 2:00 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mnonstop

12:10 pm - 6:53 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

5h 43m1 stop Montreal Pierre Elliott Trudeau Intl

$451Air Canada

Tue, Oct 6 - Wed, Oct 7

2:00 pm - 9:21 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

8h 21m1 stop Chicago O'Hare Intl

1:29 pm - 11:26 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

8h 57m1 stop Chicago O'Hare Intl

$476United Airlines

Thu, Oct 22 - Sun, Oct 25

6:05 am - 9:21 pmYOW Ottawa-STL Lambert-St Louis

16h 16m2 stops Newark Chicago O'Hare Intl

6:50 pm - 1:11 pmSTL Lambert-St Louis-YOW Ottawa

17h 21m2 stops Chicago O'Hare Intl Newark

$523United Airlines

Thu, Oct 22 - Sun, Oct 25

6:05 am - 11:22 amYOW Ottawa-STL Lambert-St Louis

6h 17m1 stop Newark

6:50 pm - 1:11 pmSTL Lambert-St Louis-YOW Ottawa

17h 21m2 stops Chicago O'Hare Intl Newark

$523United Airlines

Recent last minute flight deals from Ontario to St. Louis

Fri, Sep 18 - Mon, Sep 21

7:15 pm - 8:20 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mnonstop

2:40 pm - 5:34 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mnonstop

$553Air Canada

Fri, Sep 18 - Mon, Sep 21

12:55 pm - 2:00 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mnonstop

12:10 pm - 6:53 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

5h 43m1 stop Montreal Pierre Elliott Trudeau Intl

$577Air Canada

Sat, Sep 19 - Sat, Sep 26

12:55 pm - 2:00 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mnonstop

8:55 am - 11:49 amSTL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mnonstop

$597Air Canada

Sat, Sep 19 - Sat, Sep 26

11:00 am - 2:15 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

4h 15m1 stop Chicago O'Hare Intl

1:27 pm - 10:23 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

7h 56m2 stops Chicago O'Hare Intl Newark

$603United Airlines

Sat, Sep 19 - Sat, Sep 26

7:55 am - 4:52 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

9h 57m1 stop New York LaGuardia

5:47 pm - 11:13 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

4h 26m1 stop Minneapolis St Paul

$603Delta

Sat, Sep 19 - Sat, Sep 26

12:55 pm - 2:00 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mnonstop

12:10 pm - 6:53 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

5h 43m1 stop Montreal Pierre Elliott Trudeau Intl

$606Air Canada

Fri, Sep 18 - Wed, Sep 30

9:50 am - 4:34 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

7h 44m1 stop Orlando

2:29 pm - 2:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

22h 36m2 stops Atlanta Hartsfield-Jackson Fort Lauderdale

$629Multiple Airlines

Fri, Sep 18 - Sun, Sep 27

9:50 am - 4:34 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

7h 44m1 stop Orlando

2:00 pm - 9:55 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

30h 55m2 stops Jonesboro Nashville Intl

$630Multiple Airlines

Sat, Sep 19 - Sat, Sep 19

11:00 am - 2:15 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

4h 15m1 stop Chicago O'Hare Intl

5:30 pm - 11:59 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

5h 29m1 stop Chicago O'Hare Intl

$658United Airlines

Sat, Sep 19 - Sun, Sep 20

8:00 pm - 11:17 amYYZ Toronto Pearson Intl-STL Lambert-St Louis

16h 17m1 stop Newark

5:30 pm - 11:59 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

5h 29m1 stop Chicago O'Hare Intl

$661United Airlines

Recent direct flight deals from Ontario to St. Louis

Sat, Oct 10 - Wed, Oct 14

12:55 pm - 2:00 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mnonstop

2:40 pm - 5:34 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mnonstop

$442Air Canada

Sat, Oct 10 - Thu, Oct 15

12:55 pm - 2:00 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mnonstop

8:55 am - 11:49 amSTL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mnonstop

$442Air Canada

Wed, Nov 25 - Sun, Nov 29

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

$494Air Canada

Thu, Oct 29 - Thu, Nov 5

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

$494Air Canada

Sat, Oct 24 - Sat, Oct 31

12:55 pm - 2:00 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mnonstop

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

1h 54mnonstop

$532Air Canada

Thu, Oct 22 - Mon, Oct 26

12:55 pm - 2:00 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mnonstop

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

1h 54mnonstop

$739United Airlines

Wed, Nov 18 - Sat, Nov 21

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

$856Multiple Airlines

Mon, Nov 16 - Fri, Nov 20

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

$954United Airlines

Fri, Oct 9 - Sun, Oct 11

12:55 pm - 2:00 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mnonstop

8:55 am - 11:49 amSTL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mnonstop

$961United Airlines

Fri, Oct 9 - Sat, Oct 10

12:55 pm - 2:00 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 05mnonstop

8:55 am - 11:49 amSTL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mnonstop

$961United Airlines

Useful Info

Low season	October
High season	March
Cheapest flight	$175

Best time to beat the crowds with an average 2% drop in price.

Most popular time to fly with an average 63% 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.