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$ 180

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

...and more

In the last 7 days, travellers have searched 41,904,688 times on KAYAK, and here is why:

Save 21% 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.

Low season	January
High season	May
Cheapest flight	C$ 180

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 7% 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

29/6Sat

1 stop

10h 52mSTL-YYZ

5/7Fri

1 stop

15h 19mYYZ-STL

C$ 489

16/6Sun

1 stopSun Country Air

10h 02mSTL-YYZ

23/6Sun

1 stopSun Country Air

10h 55mYYZ-STL

C$ 510

10/9Tue

1 stopDelta

8h 32mSTL-YUL

14/9Sat

1 stopDelta

11h 55mYUL-STL

C$ 610

15/6Sat

1 stopDelta

4h 32mSTL-YYZ

18/6Tue

1 stopDelta

9h 05mYYZ-STL

C$ 619

30/6Sun

1 stopWestJet

4h 32mSTL-YYZ

1/7Mon

1 stopWestJet

5h 16mYYZ-STL

C$ 657

6/8Tue

directAir Canada

2h 23mSTL-YUL

17/8Sat

directAir Canada

2h 35mYUL-STL

C$ 697

5/7Fri

1 stopWestJet

4h 32mSTL-YYZ

8/7Mon

1 stopWestJet

16h 54mYYZ-STL

C$ 704

10/9Tue

1 stopUnited Airlines

6h 14mSTL-YUL

14/9Sat

directUnited Airlines

2h 35mYUL-STL

C$ 710

24/6Mon

directAir Canada

1h 59mSTL-YYZ

27/6Thu

directAir Canada

2h 06mYYZ-STL

C$ 727

1/7Mon

1 stopUnited Airlines

5h 47mSTL-YYZ

1/7Mon

1 stopUnited Airlines

5h 37mYYZ-STL

C$ 728

Recent one-way flight deals

8/6Sat

1 stop

11h 28mSTL-YYZ

C$ 180

5/11Tue

1 stop

12h 21mSTL-YYZ

C$ 212

9/6Sun

1 stop

27h 31mSTL-YYZ

C$ 214

30/6Sun

1 stopSun Country Air

15h 56mSTL-YUL

C$ 222

18/8Sun

1 stopDelta

8h 45mSTL-YYZ

C$ 282

5/7Fri

1 stopDelta

4h 38mSTL-YUL

C$ 283

10/7Wed

2 stopsUnited Airlines

13h 01mSTL-YUL

C$ 316

9/7Tue

directAir Canada

1h 59mSTL-YYZ

C$ 329

9/6Sun

directAir Canada

2h 01mSTL-YYZ

C$ 358

18/8Sun

directUnited Airlines

1h 59mSTL-YYZ

C$ 361

Last minute flights from St. Louis to Ontario

Last minute flight, train and bus deals

24/5Fri

multi-stop

21h 10mSTL-YUL

26/5Sun

multi-stop

11h 39mYUL-STL

C$ 785

24/5Fri

multi-stop

21h 10mSTL-YUL

26/5Sun

multi-stop

18h 30mYUL-STL

C$ 874

24/5Fri

multi-stopWestJet

5h 57mSTL-YUL

26/5Sun

multi-stopWestJet

5h 19mYUL-STL

C$ 957

23/5Thu

multi-stopWestJet

5h 29mSTL-YUL

26/5Sun

multi-stopWestJet

15h 40mYUL-STL

C$ 979

22/5Wed

multi-stopAmerican Airlines

9h 23mSTL-YYZ

29/5Wed

multi-stopAmerican Airlines

9h 32mYYZ-STL

C$ 1,059

22/5Wed

multi-stopAmerican Airlines

9h 23mSTL-YYZ

26/5Sun

multi-stopAmerican Airlines

12h 08mYYZ-STL

C$ 1,136

22/5Wed

multi-stopDelta

7h 30mSTL-YYZ

26/5Sun

multi-stopDelta

5h 17mYYZ-STL

C$ 1,260

22/5Wed

multi-stopUnited Airlines

4h 52mSTL-YYZ

26/5Sun

directUnited Airlines

2h 06mYYZ-STL

C$ 1,415

23/5Thu

multi-stopUnited Airlines

4h 22mSTL-YYZ

26/5Sun

multi-stopUnited Airlines

9h 32mYYZ-STL

C$ 1,478

22/5Wed

multi-stopDelta

7h 30mSTL-YYZ

26/5Sun

multi-stopDelta

7h 21mYYZ-STL

C$ 1,522

St. Louis - Ontario Flights

Departure:

St. Louis (STL)United States

Return flight deals:

Ontario - St. Louis

Cabin classes:

C$ 890

Browse origins:

C$ 414

Flights from St. Louis to Ontario

Find cheap flights from St. Louis to Ontario from C$ 180

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 8/6. 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

Recent round-trip flight deals

Search by stops

Search by airline

Search by price

Recent one-way flight deals

Search by stops

Search by airline

Search by price

Last minute flights from St. Louis to Ontario

Last minute flight, train and bus deals

Search by stops

Search by airline

Search by price

St. Louis - Ontario Flights

Departure:

Return flight deals:

Cabin classes:

Browse origins:

Browse destinations: