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>

C$ 260 CHEAP FLIGHTS from Ontario to St. Louis

STL

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Flights Deals

Cheap Flight Deals 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.

Round-trip

One-way

Last minute

Direct

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

KAYAK's recommended round-trip deals from the most popular airlines that fly from Ontario to St. Louis.

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

4:00 p.m. - 11:44 p.m.YYZ-STL

8h 44m1 stop

10:10 a.m. - 9:00 p.m.STL-YYZ

9h 50m1 stop

C$ 484

Find Deal

Wed, 21 May - Thu, 5 Jun

4:00 p.m. - 11:52 p.m.YYZ-STL

8h 52m1 stop

10:10 a.m. - 9:00 p.m.STL-YYZ

9h 50m1 stop

C$ 498

Find Deal

Thu, 29 May - Thu, 5 Jun

4:00 p.m. - 11:44 p.m.YYZ-STL

8h 44m1 stop

9:50 a.m. - 9:08 p.m.STL-YYZ

10h 18m2 stops

C$ 514

Find Deal

Tue, 27 May - Tue, 3 Jun

11:30 a.m. - 12:36 p.m.YYZ-STL

2h 06mdirect

7:30 a.m. - 10:25 a.m.STL-YYZ

1h 55mdirect

C$ 566Air Canada

Find Deal

Sat, 14 Jun - Sat, 21 Jun

11:30 a.m. - 12:36 p.m.YYZ-STL

2h 06mdirect

1:30 p.m. - 9:44 p.m.STL-YYZ

7h 14m1 stop

C$ 569Air Canada

Find Deal

Sat, 14 Jun - Sat, 21 Jun

11:30 a.m. - 4:35 p.m.YYZ-STL

6h 05m1 stop

9:00 a.m. - 4:10 p.m.STL-YYZ

6h 10m1 stop

C$ 609Delta

Find Deal

Thu, 22 May - Tue, 27 May

1:25 p.m. - 6:01 p.m.YYZ-STL

5h 36m1 stop

6:00 a.m. - 1:40 p.m.STL-YYZ

6h 40m1 stop

C$ 610Delta

Find Deal

Thu, 22 May - Tue, 27 May

5:15 p.m. - 9:15 p.m.YYZ-STL

5h 00m1 stop

6:30 a.m. - 2:19 p.m.STL-YYZ

6h 49m2 stops

C$ 631United Airlines

Find Deal

Wed, 28 May - Wed, 4 Jun

6:30 a.m. - 9:49 a.m.YYZ-STL

4h 19m1 stop

6:12 a.m. - 2:33 p.m.STL-YYZ

7h 21m2 stops

C$ 642British Airways

Find Deal

Thu, 22 May - Sun, 25 May

12:00 p.m. - 3:30 p.m.YYZ-STL

4h 30m1 stop

6:30 a.m. - 2:19 p.m.STL-YYZ

6h 49m2 stops

C$ 689United Airlines

Find Deal

Sat, 7 Jun - Wed, 11 Jun

Useful Info

Low season	September
High season	May
Cheapest flight	C$ 260

Best time to beat the crowds but there is an average 6% increase in price.

Most popular time to fly and prices are also 17% lower on average.

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.

Chesterfield

Eureka

Maryland Heights

St. Peters

Clayton

Wentzville

Edwardsville

Fairview Heights

Glencoe

Fenton

Farmington

Alton

Waterloo

O'Fallon

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

Airports

Cabin class

Complete your trip

Flights to other cities

Origins

Other airports

Return flight deals

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

St. Louis (STL)

STL

C$ 260 Find Cheap Flights from Ontario to St. Louis

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

Cheap Flight Deals 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.

Travelling 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

Flights to other popular destinations

Flights from domestic origins to St. Louis

Choose which airport to fly into in St. Louis

Find deals for your return flight