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$ 210 CHEAP FLIGHTS from Ontario to St. Louis

STL

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

...and more

Travellers love KAYAK

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

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Free to useThere are no hidden charges or fees.

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

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.

Round-trip

One-way

Last minute

Direct

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

Thu, 30 Oct - Thu, 6 Nov

9:45 a.m. - 1:57 p.m.YYZ-STL

29h 12m1 stop

6:22 p.m. - 2:40 p.m.STL-YYZ

43h 18m2 stops

C$ 396

Find Deal

Mon, 20 Oct - Thu, 23 Oct

10:40 a.m. - 9:07 a.m.YYZ-STL

23h 27m2 stops

10:57 a.m. - 2:05 p.m.STL-YYZ

26h 08m1 stop

C$ 410

Find Deal

Wed, 29 Oct - Wed, 5 Nov

7:50 a.m. - 6:20 p.m.YUL-STL

11h 30m2 stops

5:40 p.m. - 3:11 p.m.STL-YUL

20h 31m1 stop

C$ 501American Airlines

Find Deal

Mon, 17 Nov - Sat, 22 Nov

10:57 a.m. - 9:19 p.m.YYZ-STL

11h 22m1 stop

7:58 p.m. - 10:52 a.m.STL-YYZ

13h 54m1 stop

C$ 506American Airlines

Find Deal

Sat, 4 Oct - Sun, 12 Oct

3:00 p.m. - 7:57 p.m.YYZ-STL

5h 57m1 stop

4:05 p.m. - 7:00 p.m.STL-YYZ

1h 55mdirect

C$ 557Air Canada

Find Deal

Sat, 25 Oct - Sun, 2 Nov

2:15 p.m. - 3:18 p.m.YYZ-STL

2h 03mdirect

4:05 p.m. - 7:06 p.m.STL-YYZ

2h 01mdirect

C$ 558Air Canada

Find Deal

Tue, 25 Nov - Fri, 28 Nov

7:40 a.m. - 1:00 p.m.YYZ-STL

6h 20m1 stop

6:40 a.m. - 11:24 a.m.STL-YYZ

3h 44m1 stop

C$ 586Delta

Find Deal

Fri, 31 Oct - Fri, 7 Nov

6:52 a.m. - 12:28 p.m.YYZ-STL

6h 36m1 stop

11:49 a.m. - 7:17 p.m.STL-YYZ

6h 28m1 stop

C$ 598United Airlines

Find Deal

Fri, 24 Oct - Tue, 28 Oct

11:55 a.m. - 12:44 p.m.YOW-STL

25h 49m2 stops

1:35 p.m. - 10:26 a.m.STL-YOW

19h 51m2 stops

C$ 600United Airlines

Find Deal

Wed, 26 Nov - Sun, 30 Nov

5:10 p.m. - 11:23 p.m.YYZ-STL

7h 13m1 stop

6:09 p.m. - 11:05 p.m.STL-YYZ

3h 56m1 stop

C$ 635Delta

Find Deal

Cheapest round-trip

C$ 396

Overall average: C$ 674

Multiple Airlines

Thu 30/10Thu 6/11

YYZ - STL • 1 stop

Cheapest direct flights

C$ 558

Typical prices: C$ 553-1138

Air Canada

Sat 25/10Sun 2/11

YYZ - STL • Direct

Start a new search

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

We hope you love your trip to St. Louis!

Useful Info

Low season	July
High season	May
Cheapest flight	C$ 210

Best time to beat the crowds but there is an average 11% increase in price.

Most popular time to fly and prices are also 22% 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.

Collinsville

Chesterfield

Maryland Heights

St. Charles

Eureka

Wentzville

Glencoe

Farmington

Edwardsville

Fairview Heights

Clayton

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

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

St. Louis (STL)

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.

STL

C$ 210 Find Cheap Flights from Ontario to St. Louis

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

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

Everything you should know

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