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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

$149 CHEAP FLIGHTS from Ontario to St. Louis

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

...and more

Travelers love KAYAK

41,299,237 searches in the past 7 days on KAYAK

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Filter your dealsChoose cabin class, free Wi-Fi and more.

Cheapest round-trip

$257

Overall average: $532

Multiple Airlines

Tue 2/10Sun 3/1

YYZ - STL • 1 stop

Cheapest non-stop

$410

Typical prices: $419-$564

Air Canada

Tue 2/10Sun 3/1

YYZ - STL • Non-stop

Start a new search

KAYAK searches 100s of sites at once to find you the best travel deals.

We hope you love your trip to St. Louis!

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

Tue, Feb 10 - Sun, Mar 1

7:15 am - 10:27 pm

YYZ

STL

16h 12m

1 stop

10:11 pm - 6:43 am

STL

YYZ

31h 32m

1 stop

$257Multiple Airlines

Tue, Feb 10 - Sun, Mar 1

7:15 am - 10:27 pm

YYZ

STL

16h 12m

1 stop

10:11 pm - 9:11 pm

STL

YYZ

22h 00m

2 stops

$261Multiple Airlines

Tue, Feb 24 - Tue, Mar 3

5:11 pm - 9:05 pm

YOW

STL

4h 54m

1 stop

6:25 am - 2:27 pm

STL

YOW

7h 02m

2 stops

$319United Airlines

Sat, May 16 - Mon, May 18

7:00 am - 12:06 pm

YOW

STL

6h 06m

1 stop

7:30 am - 1:10 pm

STL

YOW

4h 40m

1 stop

$343Air Canada

Wed, Mar 25 - Tue, Mar 31

5:15 pm - 7:17 am

YYZ

STL

15h 02m

1 stop

11:27 am - 12:14 am

STL

YYZ

35h 47m

2 stops

$343Multiple Airlines

Tue, Feb 24 - Tue, Mar 3

3:45 pm - 11:48 pm

YUL

STL

9h 03m

1 stop

6:00 am - 3:04 pm

STL

YUL

8h 04m

1 stop

$360American Airlines

Wed, Mar 25 - Tue, Mar 31

6:00 am - 1:39 pm

YYZ

STL

8h 39m

1 stop

12:05 pm - 9:29 pm

STL

YYZ

8h 24m

1 stop

$361American Airlines

Tue, Feb 24 - Tue, Mar 3

2:05 pm - 9:05 pm

YOW

STL

8h 00m

2 stops

6:25 am - 4:30 pm

STL

YOW

9h 05m

2 stops

$381United Airlines

Thu, Mar 26 - Mon, Mar 30

6:00 am - 9:46 am

YUL

STL

4h 46m

1 stop

1:39 pm - 11:13 pm

STL

YUL

8h 34m

1 stop

$465Delta

Sun, May 10 - Sat, May 16

6:10 pm - 8:05 pm

YUL

STL

2h 55mnonstop

7:30 am - 3:21 pm

STL

YUL

6h 51m

1 stop

$468Air Canada

Useful Info

Low season	June
High season	May
Cheapest flight	$149

Best time to beat the crowds with an average 5% drop in price.

Most popular time to fly with an average 11% 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.

O'Fallon

Wentzville

Farmington

Eureka

Litchfield

Grafton

Shrewsbury

Glencoe

Everything you need to know for your flight to St. Louis

Airports

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Information on the airport you'll fly into in St. Louis

St. Louis (STL)

$149 Find Cheap Flights from Ontario to St. Louis

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

Everything you should know

Cheap Flights from Ontario to St. Louis

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

Recent one-way flight deals from Ontario to St. Louis

Recent last minute flight deals from Ontario to St. Louis

Recent direct flight deals from Ontario to St. Louis

Good to know

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.

Traveling to a place near St. Louis?

Everything you need to know for your flight to St. Louis

Information on the airport you'll fly into in St. Louis

Cabin class types available on flights to Ontario

Complete your trip to St. Louis with a hotel stay or car rental

Find direct flights for St. Louis

Flights to other popular destinations

Flights from domestic origins to St. Louis

Choose which airport to fly into in St. Louis