How does KAYAK find such low prices on flights from St. Louis to Ontario?

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 St. Louis to Ontario. 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 St. Louis to Ontario?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from St. Louis 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 St. Louis to Ontario?

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 Ontario with an airline and back to St. Louis 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 St. Louis to Ontario?

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 Ontario from St. Louis 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>

Cheap Flights from St. Louis to Ontario from C$ 148

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...and more

In the last 7 days, travellers have searched 43,369,418 times on KAYAK, and here is why:

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Low season	January
High season	May
Cheapest flight	C$ 148

Best time to beat the crowds (42% less expensive on average)

Most popular time to fly (9% more expensive on average)

Flight from St. Louis to Toronto

How does KAYAK find such low prices on flights from St. Louis to Ontario?
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 St. Louis to Ontario.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Ontario?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from St. Louis 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 St. Louis to Ontario?
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 Ontario with an airline and back to St. Louis with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Ontario?
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 Ontario from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Morning departure is around 2% cheaper than an evening flight, on average*.

*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

Book cheap flights from St. Louis to Ontario

Recent round-trip flight deals

4/6Tue

1 stop

10h 12mSTL-YYZ

11/6Tue

1 stop

8h 53mYYZ-STL

C$ 334

29/5Wed

1 stop

18h 06mSTL-YYZ

1/6Sat

1 stop

10h 55mYYZ-STL

C$ 392

29/5Wed

1 stopDelta

8h 37mSTL-YYZ

5/6Wed

1 stopDelta

8h 49mYYZ-STL

C$ 668

16/7Tue

1 stopDelta

8h 38mSTL-YYZ

22/7Mon

1 stopDelta

7h 53mYYZ-STL

C$ 690

16/7Tue

directUnited Airlines

1h 59mSTL-YYZ

23/7Tue

directUnited Airlines

2h 06mYYZ-STL

C$ 729

1/7Mon

directUnited Airlines

1h 59mSTL-YYZ

10/7Wed

1 stopUnited Airlines

5h 37mYYZ-STL

C$ 749

7/6Fri

1 stopAmerican Airlines

8h 15mSTL-YYZ

14/6Fri

1 stopAmerican Airlines

4h 44mYYZ-STL

C$ 759

31/5Fri

1 stopAmerican Airlines

5h 39mSTL-YYZ

7/6Fri

1 stopAmerican Airlines

5h 40mYYZ-STL

C$ 760

8/6Sat

1 stopAir Canada

6h 38mSTL-YYZ

9/6Sun

directAir Canada

2h 06mYYZ-STL

C$ 770

19/9Thu

directAir Canada

1h 54mSTL-YYZ

24/9Tue

directAir Canada

2h 05mYYZ-STL

C$ 785

Recent one-way flight deals

12/6Wed

1 stop

10h 13mSTL-YYZ

C$ 148

14/5Tue

1 stop

9h 51mSTL-YYZ

C$ 170

18/5Sat

3 stops

25h 20mSTL-YYZ

C$ 178

14/6Fri

1 stopAmerican Airlines

6h 59mSTL-YYZ

C$ 342

21/5Tue

directAir Canada

2h 01mSTL-YYZ

C$ 401

21/5Tue

directAir Canada

2h 01mSTL-YYZ

C$ 402

22/5Wed

1 stopAmerican Airlines

5h 44mSTL-YYZ

C$ 409

22/5Wed

1 stopDelta

4h 27mSTL-YYZ

C$ 417

14/5Tue

directUnited Airlines

2h 01mSTL-YYZ

C$ 499

14/6Fri

directUnited Airlines

2h 01mSTL-YYZ

C$ 623

Last minute flights from St. Louis to Ontario

Last minute flight, train and bus deals

9/5Thu

multi-stop

11h 05mSTL-YYZ

11/5Sat

multi-stop

10h 55mYYZ-STL

C$ 442

9/5Thu

multi-stop

11h 05mSTL-YYZ

11/5Sat

multi-stop

22h 29mYYZ-STL

C$ 593

9/5Thu

multi-stop

11h 05mSTL-YYZ

11/5Sat

multi-stop

28h 29mYYZ-STL

C$ 604

7/5Tue

multi-stop

9h 51mSTL-YYZ

8/5Wed

multi-stop

19h 33mYYZ-STL

C$ 694

8/5Wed

multi-stopDelta

17h 30mSTL-YYZ

11/5Sat

multi-stopDelta

23h 02mYYZ-STL

C$ 1,059

8/5Wed

multi-stopDelta

13h 35mSTL-YYZ

11/5Sat

multi-stopDelta

27h 01mYYZ-STL

C$ 1,085

7/5Tue

multi-stopAmerican Airlines

18h 53mSTL-YYZ

8/5Wed

multi-stopAmerican Airlines

9h 07mYYZ-STL

C$ 1,305

8/5Wed

multi-stopUnited Airlines

5h 40mSTL-YYZ

11/5Sat

directUnited Airlines

2h 06mYYZ-STL

C$ 1,371

8/5Wed

directAir Canada

2h 01mSTL-YYZ

11/5Sat

directAir Canada

2h 06mYYZ-STL

C$ 1,692

7/5Tue

directUnited Airlines

2h 05mSTL-YYZ

8/5Wed

directUnited Airlines

2h 06mYYZ-STL

C$ 1,934

St. Louis - Ontario Flights

Departure:

St. Louis (STL)United States

Return flight deals:

Ontario - St. Louis

Cabin classes:

C$ 781

Browse origins:

C$ 392

Flights from St. Louis to Ontario

Find cheap flights from St. Louis to Ontario from C$ 148

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Ontario departing on 12/6. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.

Search hundreds of travel sites at once for deals on flights to Ontario

Good to know

Low season

High season

Cheapest flight

FAQs - booking Ontario flights

How does KAYAK find such low prices on flights from St. Louis to Ontario?

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Ontario?

What is the Hacker Fare option on flights from St. Louis to Ontario?

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Ontario?

Top tips for finding cheap flights to Ontario

Book cheap flights from St. Louis to Ontario

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