What airlines fly to Region of Ontario?

Air Canada, United Airlines and American Airlines are the top three most popular airlines that fly to Region of Ontario from St. Louis according to our data. Air Canada is the first choice among our users, with 71% of people opting to fly with this airline when traveling to Region of Ontario. Keep in mind that there are 3 different airlines that fly to Region of Ontario on a routine basis, so you have a few additional options to choose from.

How many flights depart from St. Louis to Region of Ontario on average per week?

As of October 2026, there are 2 flights per week flying from St. Louis to Region of Ontario. The most common day of the week flights depart is Sun, with 100% of flights taking off on this day.

What is the cheapest airline that flies from Lambert-St Louis to Ontario?

American Airlines, United Airlines, and Porter Airlines are the most popular carriers operating from Lambert-St Louis to Ontario

When did momondo last update prices for flights from Lambert-St Louis Airport to Ontario?

Prices for flights from Lambert-St Louis Airport to Ontario were last updated today.

How many operators does momondo search for flights from Lambert-St Louis Airport to Ontario?

The number of operators available for flights from Lambert-St Louis Airport to Ontario is 3 as of October 2026.

How old do you have to be to fly from Lambert-St Louis Airport to Ontario?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Ontario.

What documentation or ID do you need to fly to Ontario?

The required travel and health documents for your Ontario trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ontario. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$123 Cheap Flights from St. Louis to Ontario in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Ontario

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:13 pm - 1:40 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

18h 27m1 stop Orlando

2:25 pm - 11:17 amYYZ Toronto Pearson Intl-STL Lambert-St Louis

45h 52m2 stops Tampa Atlanta Hartsfield-Jackson

$369Multiple Airlines

Wed, Dec 2 - Mon, Dec 7

12:05 pm - 1:40 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

24h 35m2 stops Atlanta Hartsfield-Jackson Orlando

6:30 am - 12:12 amYYZ Toronto Pearson Intl-STL Lambert-St Louis

18h 42m1 stop Orlando

$380Multiple Airlines

Wed, Dec 2 - Sun, Dec 6

7:54 pm - 6:15 pmSTL Lambert-St Louis-YTZ Toronto Island

21h 21m2 stops Denver Intl Nashville Intl

9:10 am - 11:17 amYTZ Toronto Island-STL Lambert-St Louis

27h 07m2 stops Washington, D.C. Dulles Intl Atlanta Hartsfield-Jackson

$382Multiple Airlines

Fri, Dec 11 - Sun, Dec 13

5:00 am - 5:40 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

11h 40m1 stop Chicago O'Hare Intl

11:36 am - 7:58 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

9h 22m1 stop Chicago O'Hare Intl

$389American Airlines

Thu, Nov 26 - Wed, Dec 9

7:21 am - 5:44 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

9h 23m1 stop Chicago O'Hare Intl

3:20 pm - 10:34 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

8h 14m1 stop Chicago O'Hare Intl

$389American Airlines

Fri, Feb 5 - Mon, Feb 8

6:02 am - 2:42 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

7h 40m1 stop Chicago O'Hare Intl

1:22 pm - 10:17 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

9h 55m1 stop Chicago O'Hare Intl

$389American Airlines

Tue, Dec 8 - Tue, Dec 15

6:30 am - 4:47 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

9h 17m1 stop Chicago O'Hare Intl

10:53 am - 10:59 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

13h 06m1 stop Chicago O'Hare Intl

$715United Airlines

Tue, Dec 1 - Wed, Dec 2

6:04 am - 9:56 pmSTL Lambert-St Louis-YOW Ottawa

14h 52m1 stop Newark

6:00 am - 11:05 pmYOW Ottawa-STL Lambert-St Louis

18h 05m1 stop Newark

$772United Airlines

Tue, Dec 29 - Sat, Jan 2

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

$858Air Canada

Sun, Nov 15 - Wed, Nov 18

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

$858Air Canada

Mon, Nov 9 - Fri, Nov 13

Cheap last minute flights

Enter your travel dates to find the best prices.

4:26 pm - 12:21 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

18h 55m2 stops Orlando Newark

6:30 am - 11:59 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

18h 29m1 stop Orlando

$502Multiple Airlines

Sat, Oct 31 - Sun, Nov 22

4:26 pm - 12:21 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

18h 55m2 stops Orlando Newark

6:30 am - 11:59 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

18h 29m1 stop Orlando

$559Multiple Airlines

Sat, Oct 31 - Sat, Nov 21

1:35 pm - 1:40 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

23h 05m2 stops Dallas/Fort Worth Orlando

6:30 am - 11:59 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

18h 29m1 stop Orlando

$564Multiple Airlines

Sun, Nov 1 - Mon, Nov 23

11:28 am - 5:49 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

5h 21m1 stop Newark

8:20 am - 3:43 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

8h 23m1 stop Chicago O'Hare Intl

$875United Airlines

Sat, Oct 31 - Fri, Nov 20

9:44 am - 5:49 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

7h 05m1 stop Newark

8:35 am - 3:43 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

8h 08m1 stop Chicago O'Hare Intl

$875United Airlines

Sat, Oct 31 - Wed, Nov 25

6:09 am - 1:43 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

6h 34m1 stop Newark

3:35 pm - 11:24 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

8h 49m1 stop Chicago O'Hare Intl

$875United Airlines

Sat, Oct 31 - Sat, Nov 21

1:20 pm - 11:02 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

8h 42m2 stops Washington, D.C. Reagan-National New York LaGuardia

12:15 pm - 3:19 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

28h 04m1 stop Washington, D.C. Reagan-National

$882American Airlines

Wed, Oct 28 - Thu, Nov 26

9:17 am - 6:45 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

8h 28m1 stop New York LaGuardia

12:15 pm - 10:08 amYYZ Toronto Pearson Intl-STL Lambert-St Louis

22h 53m1 stop Washington, D.C. Reagan-National

$888American Airlines

Thu, Oct 29 - Thu, Nov 26

4:05 pm - 6:59 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mnonstop

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

$1,352Air Canada

Mon, Nov 2 - Thu, Nov 5

4:05 pm - 6:59 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

1h 54mnonstop

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

$1,352Air Canada

Sun, Nov 1 - Tue, Nov 3

Cheap direct flights

Enter your travel dates to find the best prices.

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

$858Air Canada

Sun, Nov 15 - Wed, Nov 18

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

$858Air Canada

Mon, Nov 9 - Fri, Nov 13

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

$858Air Canada

Thu, Nov 26 - Wed, Dec 9

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

$858Air Canada

Wed, Dec 9 - Wed, Dec 16

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

$1,159United Airlines

Thu, Jan 28 - Sun, Jan 31

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

$1,254United Airlines

Wed, Feb 17 - Sun, Feb 21

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

$1,395Multiple Airlines

Sun, Nov 22 - Sun, Nov 29

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

$1,599Multiple Airlines

Sat, Dec 19 - Mon, Dec 21

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

$1,846Multiple Airlines

Sat, Dec 19 - Sat, Jan 2

4:05 pm - 7:05 pmSTL Lambert-St Louis-YYZ Toronto Pearson Intl

2h 00mnonstop

2:10 pm - 3:26 pmYYZ Toronto Pearson Intl-STL Lambert-St Louis

2h 16mnonstop

$2,147United Airlines

Fri, Nov 20 - Fri, Nov 27

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American Airlines flights from St. Louis to Region of Ontario

Our best American Airlines deals on St. Louis to Region of Ontario flight tickets

American Airlines

Nov 16

STL7:26 amLambert-St Louis

9h 15m

1 stop

YYZ5:41 pmToronto Pearson Intl

Nov 18

YYZ3:15 pmToronto Pearson Intl

8h 00m

1 stop

STL10:15 pmLambert-St Louis

$389

American Airlines

Nov 19

STL6:59 amLambert-St Louis

8h 34m

1 stop

YYZ4:33 pmToronto Pearson Intl

Nov 21

YYZ11:45 amToronto Pearson Intl

8h 42m

1 stop

STL7:27 pmLambert-St Louis

$443

American Airlines

Dec 1

STL6:59 amLambert-St Louis

8h 34m

1 stop

YYZ4:33 pmToronto Pearson Intl

Dec 3

YYZ11:36 amToronto Pearson Intl

9h 22m

1 stop

STL7:58 pmLambert-St Louis

$444

Air Canada flights from St. Louis to Region of Ontario

Our best Air Canada deals on St. Louis to Region of Ontario flight tickets

Air Canada

Nov 4

STL4:05 pmLambert-St Louis

2h 00m

YYZ7:05 pmToronto Pearson Intl

Nov 7

YYZ2:10 pmToronto Pearson Intl

2h 16m

STL3:26 pmLambert-St Louis

$552

Air Canada

Dec 22

STL10:45 amLambert-St Louis

10h 47m

2 stops

YOW10:32 pmOttawa

Jan 2

YOW10:05 amOttawa

9h 57m

2 stops

STL7:02 pmLambert-St Louis

$985

Air Canada

Oct 28

STL10:53 amLambert-St Louis

7h 59m

2 stops

YOW7:52 pmOttawa

Oct 31

YOW10:05 amOttawa

6h 18m

1 stop

STL3:23 pmLambert-St Louis

$1,381

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Wed 12/2

6:13 pm-1:40 pm

1 stop18h 27m

Toronto Pearson Intl

Mon 12/7

2:25 pm-11:17 am

2 stops45h 52m

$369

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Wed 12/2

12:05 pm-1:40 pm

2 stops24h 35m

Toronto Pearson Intl

Sun 12/6

6:30 am-12:12 am

1 stop18h 42m

$380

St. LouisToronto

STL Lambert-St Louis - YTZ Toronto Island

STLYTZ

Lambert-St Louis

Fri 12/11

7:54 pm-6:15 pm

2 stops21h 21m

Toronto Island

Sun 12/13

9:10 am-11:17 am

2 stops27h 07m

$382

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Thu 11/26

5:00 am-5:40 pm

1 stop11h 40m

Toronto Pearson Intl

Wed 12/9

11:36 am-7:58 pm

1 stop9h 22m

$389

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Fri 2/5

7:21 am-5:44 pm

1 stop9h 23m

Toronto Pearson Intl

Mon 2/8

3:20 pm-10:34 pm

1 stop8h 14m

$389

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Tue 12/8

6:02 am-2:42 pm

1 stop7h 40m

Toronto Pearson Intl

Tue 12/15

1:22 pm-10:17 pm

1 stop9h 55m

$389

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Tue 12/1

6:30 am-4:47 pm

1 stop9h 17m

Toronto Pearson Intl

Wed 12/2

10:53 am-10:59 pm

1 stop13h 06m

$715

St. LouisOttawa

STL Lambert-St Louis - YOW Ottawa

STLYOW

Lambert-St Louis

Tue 12/29

6:04 am-9:56 pm

1 stop14h 52m

Ottawa

Sat 1/2

6:00 am-11:05 pm

1 stop18h 05m

$772

Quickest round-trip

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Sun 11/15

4:05 pm-7:05 pm

Nonstop2h 00m

Toronto Pearson Intl

Wed 11/18

2:10 pm-3:26 pm

Nonstop2h 16m

$858

St. LouisToronto

STL Lambert-St Louis - YYZ Toronto Pearson Intl

STLYYZ

Lambert-St Louis

Mon 11/9

4:05 pm-7:05 pm

Nonstop2h 00m

Toronto Pearson Intl

Fri 11/13

2:10 pm-3:26 pm

Nonstop2h 16m

$858

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from St. Louis to Region of Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to Region of Ontario?

The month of March is, on average, the cheapest month to fly to Region of Ontario from St. Louis, with most prices found around $425. If you aren’t able to travel during the month of March, then book flights to Region of Ontario from St. Louis during May instead. Flights to Region of Ontario in May, while not as cheap as those in March, still average around $557.

What is the cheapest day to depart on your flight to Region of Ontario?

According to our data, Friday is the cheapest day to fly to Region of Ontario from St. Louis. The lowest ticket price found for a Friday departure recently was $788. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from St. Louis to Region of Ontario on a Saturday will generally be more expensive and average around $967. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Region of Ontario?

According to our data, the cheapest time of day to fly to Region of Ontario is in the morning. momondo users have found flights departing from St. Louis to Region of Ontario in the morning for as low as $709. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights at noon are often more expensive with an average ticket price of $1,066.

What is the cheapest Lambert-St Louis to Ontario flight route?

Fly from Lambert-St Louis to Toronto Pearson Intl for the best Lambert-St Louis - Ontario flight prices

What cabin class options are available on St. Louis to Region of Ontario flights?

There are 4 cabin classes available to choose from on St. Louis to Region of Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on St. Louis to Region of Ontario flights?

You could potentially save up to 40% on your flight if you consider stops on a St. Louis to Region of Ontario flight.

Cheap St. Louis to Region of Ontario flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Region of Ontario

Best Price Found	$123
Fastest flight time	1h 54m
Direct flights	Every day
Airports in Region of Ontario	125 airports

The best one-way flight to Region of Ontario from St. Louis in the past 72 hours is $123. The best round-trip flight deal from St. Louis to Region of Ontario found on momondo in the last 72 hours is $369.

The fastest flight from St. Louis to Region of Ontario takes 1h 54m

Direct flights go from St. Louis to Region of Ontario every day.

There are 125 airports in Region of Ontario. From St. Louis there are direct flights to Toronto Pearson Intl (YYZ).

Search flight deals

Frequently asked questions about flying from St. Louis to Ontario

When did momondo last update prices for flights from Lambert-St Louis Airport to Ontario?
Prices for flights from Lambert-St Louis Airport to Ontario were last updated today.
How many operators does momondo search for flights from Lambert-St Louis Airport to Ontario?
The number of operators available for flights from Lambert-St Louis Airport to Ontario is 3 as of October 2026.
How old do you have to be to fly from Lambert-St Louis Airport to Ontario?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Ontario.
What documentation or ID do you need to fly to Ontario?
The required travel and health documents for your Ontario trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ontario. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from St. Louis to Region of Ontario?
momondo data reveals that the most frequently booked plane model on the route from St. Louis to Region of Ontario is Canadair (Bombardier) Regional Jet 900, representing 47.33% of all bookings. The subsequent popular models are Embraer 175 at 30.67%, Boeing 787-8 Dreamliner at 6.00%, and Boeing 787-9 Dreamliner at 4.00%.

Best airlines flying from St. Louis to Region of Ontario

Compare and see reviews for airlines that fly from St. Louis to Region of Ontario with momondo

Airline	Rating	Free Cancellation	Price
Air Canada	PriceFrom $139	Free Cancellation	Rating 7.1 11,819 reviews	Search Air Canada flights
United Airlines	PriceFrom $203	Free Cancellation	Rating 7.3 10,443 reviews	Search United Airlines flights
American Airlines	PriceFrom $270	Free Cancellation	Rating 7.0 12,190 reviews	Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Ontario?

It is quick and easy to find St. Louis to Ontario flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Ontario that suits you.

Can I find flights from St. Louis to Ontario with flexible booking policies on momondo?

Yes. All flights to Ontario from St. Louis on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from St. Louis to Ontario?

Once you have performed a search for St. Louis to Ontario flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from St. Louis to Ontario right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Ontario, momondo offers a useful price alert feature which will track prices for flights to Ontario from St. Louis and alert you when they change.