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Cheap flights from St. Louis to Ontario from $80

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Ontario departing on 2/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from St. Louis to Ontario

Cheap round-trip flights

These are some of the best round-trip flight deals from St. Louis to Ontario that have been recently found on momondo from popular airlines, departing in the coming months.

Cheap one-way flights

Flying one-way? These are some of the best deals recently discovered on momondo for flights from St. Louis to Ontario.

Cheap last minute flights

Planning a quick getaway from St. Louis to Ontario? These are the last-minute flight deals available now.

Cheap direct flights

If you prefer a non-stop journey, check out our latest direct flight deals to Ontario, so you can enjoy a seamless trip without layovers.

Cheap bus & train deals from St. Louis to Ontario

Find recent round-trip train or bus tickets from St. Louis to Ontario.

All round-trip flight deals to Ontario

The cheapest plane tickets to Ontario found on KAYAK recently.
5:20 pm - 11:44 pmSTL-YYZ
29h 24m1 stop
7:25 pm - 5:43 pmYYZ-STL
23h 18m1 stop
Sun, Mar 2 - Tue, Mar 4
5:20 pm - 11:44 pmSTL-YYZ
29h 24m1 stop
7:25 pm - 9:16 amYYZ-STL
14h 51m2 stops
Sun, Mar 2 - Tue, Mar 4
8:50 am - 7:10 pmSTL-YUL
9h 20m1 stop
5:15 pm - 8:58 amYUL-STL
16h 43m1 stop
$458Delta
Find Deal
Sat, Jan 25 - Mon, Jan 27
6:06 am - 4:08 pmSTL-YYZ
9h 02m1 stop
7:55 am - 4:49 pmYYZ-STL
9h 54m1 stop
$474Delta
Find Deal
Mon, Feb 3 - Mon, Feb 10
5:40 am - 5:35 pmSTL-YYZ
10h 55m1 stop
1:14 pm - 10:09 pmYYZ-STL
9h 55m1 stop
$505American Airlines
Find Deal
Mon, Feb 3 - Mon, Feb 10
5:40 am - 5:35 pmSTL-YYZ
10h 55m1 stop
1:14 pm - 10:09 pmYYZ-STL
9h 55m1 stop
$516American Airlines
Find Deal
Thu, Jan 16 - Wed, Jan 22
8:05 am - 1:42 pmSTL-YYZ
4h 37m1 stop
1:50 pm - 3:06 pmYYZ-STL
2h 16mnonstop
$548Air Canada
Find Deal
Sun, Mar 2 - Tue, Mar 4
3:50 pm - 6:45 pmSTL-YYZ
1h 55mnonstop
1:50 pm - 3:06 pmYYZ-STL
2h 16mnonstop
$584Air Canada
Find Deal
Wed, Jan 8 - Wed, Jan 22
9:44 am - 1:42 pmSTL-YYZ
26h 58m1 stop
7:20 am - 8:02 pmYYZ-STL
13h 42m2 stops
$585United Airlines
Find Deal
Thu, Jan 16 - Wed, Jan 22
9:44 am - 10:15 pmSTL-YYZ
11h 31m2 stops
6:52 am - 3:38 pmYYZ-STL
9h 46m1 stop
$606United Airlines
Find Deal
Mon, Jan 13 - Wed, Jan 15
5:05 pm - 1:55 pmSTL-YYZ
19h 50m1 stop
Tue, Feb 11
5:05 pm - 1:55 pmSTL-YYZ
19h 50m1 stop
Wed, Jan 15
5:05 pm - 1:55 pmSTL-YYZ
19h 50m1 stop
Wed, Jan 8
6:30 am - 1:42 pmSTL-YYZ
6h 12m1 stop
$234Air Canada
Find Deal
Thu, Jan 16
3:50 pm - 6:45 pmSTL-YYZ
1h 55mnonstop
$273Air Canada
Find Deal
Sat, Jan 11
3:50 pm - 6:45 pmSTL-YYZ
1h 55mnonstop
$284United Airlines
Find Deal
Tue, Feb 11
12:00 pm - 8:29 pmSTL-YYZ
7h 29m1 stop
$322Delta
Find Deal
Wed, May 14
6:45 am - 5:42 pmSTL-YYZ
9h 57m2 stops
$359Delta
Find Deal
Wed, May 14
7:23 am - 9:30 pmSTL-YYZ
13h 07m1 stop
$509American Airlines
Find Deal
Wed, Jan 1
6:30 am - 3:09 pmSTL-YYZ
7h 39m2 stops
$514American Airlines
Find Deal
Wed, Jan 1
7:43 am - 5:09 pmSTL-YOW
8h 26m1 stop
4:20 pm - 11:40 pmYOW-STL
8h 20m1 stop
Mon, Dec 30 - Fri, Jan 3
3:53 pm - 11:45 amSTL-YYZ
18h 52m1 stop
7:10 am - 11:28 pmYYZ-STL
17h 18m1 stop
Sat, Dec 28 - Sat, Jan 4
9:50 am - 11:45 amSTL-YYZ
24h 55m3 stops
7:05 am - 5:02 pmYYZ-STL
10h 57m1 stop
Sat, Dec 28 - Sat, Jan 4
6:00 am - 8:20 pmSTL-YOW
13h 20m2 stops
4:20 pm - 11:40 pmYOW-STL
8h 20m1 stop
Mon, Dec 30 - Fri, Jan 3
5:52 pm - 2:42 pmSTL-YYZ
19h 50m2 stops
7:05 am - 5:02 pmYYZ-STL
10h 57m1 stop
Sat, Dec 28 - Sat, Jan 4
9:50 am - 11:45 amSTL-YYZ
24h 55m3 stops
8:15 pm - 3:21 pmYYZ-STL
20h 06m2 stops
Sat, Dec 28 - Sat, Jan 4
9:50 am - 11:45 amSTL-YYZ
24h 55m3 stops
7:15 am - 3:21 pmYYZ-STL
33h 06m3 stops
Sat, Dec 28 - Sat, Jan 4
5:00 am - 2:29 pmSTL-YOW
8h 29m2 stops
6:00 am - 12:26 pmYOW-STL
7h 26m2 stops
$1,262United Airlines
Find Deal
Mon, Dec 30 - Fri, Jan 3
6:25 am - 12:31 pmSTL-YYZ
5h 06m1 stop
1:50 pm - 3:06 pmYYZ-STL
2h 16mnonstop
$1,580
Find Deal
Sat, Dec 28 - Sat, Jan 4
3:50 pm - 6:45 pmSTL-YYZ
1h 55mnonstop
1:50 pm - 3:06 pmYYZ-STL
2h 16mnonstop
$2,134Air Canada
Find Deal
Sat, Dec 28 - Sat, Jan 4
3:50 pm - 6:45 pmSTL-YYZ
1h 55mnonstop
1:50 pm - 3:06 pmYYZ-STL
2h 16mnonstop
$584Air Canada
Find Deal
Wed, Jan 8 - Wed, Jan 22
3:50 pm - 6:45 pmSTL-YYZ
1h 55mnonstop
1:50 pm - 3:06 pmYYZ-STL
2h 16mnonstop
$617United Airlines
Find Deal
Sun, Mar 2 - Wed, Mar 5
3:50 pm - 6:45 pmSTL-YYZ
1h 55mnonstop
1:50 pm - 3:06 pmYYZ-STL
2h 16mnonstop
$618United Airlines
Find Deal
Mon, Feb 3 - Mon, Feb 10
3:50 pm - 6:45 pmSTL-YYZ
1h 55mnonstop
1:50 pm - 3:06 pmYYZ-STL
2h 16mnonstop
$670United Airlines
Find Deal
Thu, Jan 16 - Wed, Jan 22
3:50 pm - 6:45 pmSTL-YYZ
1h 55mnonstop
1:50 pm - 3:06 pmYYZ-STL
2h 16mnonstop
$713Air Canada
Find Deal
Thu, Jan 9 - Thu, Jan 23
3:50 pm - 6:45 pmSTL-YYZ
1h 55mnonstop
1:50 pm - 3:06 pmYYZ-STL
2h 16mnonstop
$723Air Canada
Find Deal
Mon, Jan 13 - Wed, Jan 15
1:30 pm - 5:00 pmSTL-YUL
2h 30mnonstop
6:10 pm - 8:01 pmYUL-STL
2h 51mnonstop
$757Air Canada
Find Deal
Wed, May 28 - Mon, Jun 2
3:50 pm - 6:45 pmSTL-YYZ
1h 55mnonstop
1:50 pm - 3:06 pmYYZ-STL
2h 16mnonstop
$766Air Canada
Find Deal
Wed, Jan 8 - Sat, Jan 11
3:50 pm - 6:45 pmSTL-YYZ
1h 55mnonstop
1:50 pm - 3:06 pmYYZ-STL
2h 16mnonstop
$793Air Canada
Find Deal
Fri, Mar 14 - Tue, Mar 18
4:05 pm - 7:00 pmSTL-YYZ
1h 55mnonstop
2:10 pm - 3:16 pmYYZ-STL
2h 06mnonstop
$830Air Canada
Find Deal
Tue, Jun 10 - Tue, Jun 17

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
Feb 3
STL5:40 amLambert-St Louis
10h 55m
1 stop
YYZ5:35 pmToronto Pearson Intl
Feb 10
YYZ1:14 pmToronto Pearson Intl
9h 55m
1 stop
STL10:09 pmLambert-St Louis
American Airlines
Jan 16
STL5:40 amLambert-St Louis
10h 55m
1 stop
YYZ5:35 pmToronto Pearson Intl
Jan 22
YYZ1:14 pmToronto Pearson Intl
9h 55m
1 stop
STL10:09 pmLambert-St Louis
American Airlines
Feb 7
STL5:03 pmLambert-St Louis
16h 07m
1 stop
YUL10:10 amMontreal Pierre Elliott Trudeau Intl
Feb 9
YUL10:55 amMontreal Pierre Elliott Trudeau Intl
10h 05m
1 stop
STL8:00 pmLambert-St Louis

United Airlines flights from St. Louis to Region of Ontario

Our best United Airlines deals on St. Louis to Region of Ontario flight tickets
United Airlines
Jan 16
STL9:44 amLambert-St Louis
26h 58m
1 stop
YYZ1:42 pmToronto Pearson Intl
Jan 22
YYZ7:20 amToronto Pearson Intl
13h 42m
2 stops
STL8:02 pmLambert-St Louis
United Airlines
Jan 13
STL9:44 amLambert-St Louis
11h 31m
2 stops
YYZ10:15 pmToronto Pearson Intl
Jan 15
YYZ6:52 amToronto Pearson Intl
9h 46m
1 stop
STL3:38 pmLambert-St Louis
United Airlines
Mar 2
STL3:50 pmLambert-St Louis
1h 55m
YYZ6:45 pmToronto Pearson Intl
Mar 5
YYZ1:50 pmToronto Pearson Intl
2h 16m
STL3:06 pmLambert-St Louis

See travel insights to Ontario from

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

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 $215. If you aren’t able to travel during the month of March, then book flights to Region of Ontario from St. Louis during April instead. Flights to Region of Ontario in April, while not as cheap as those in March, still average around $228.

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

According to our data, Thursday is the cheapest day to fly to Region of Ontario from St. Louis. The lowest ticket price found for a Thursday departure recently was $262. 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 $543. 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 at noon. momondo users have found flights departing from St. Louis to Region of Ontario at noon for as low as $225. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the morning are often more expensive with an average ticket price of $476.

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

How far in advance should I book a flight to Region of Ontario?

The ideal time to book your flight to Region of Ontario is 53 days in advance when prices tend to average $439. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Region of Ontario from St. Louis for as low as $196 on momondo.

What cabin class options are available on Lambert-St Louis to Ontario flights?

There are 3 cabin classes available to choose from on Lambert-St Louis to 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 65% 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

$80

Fastest flight time

1h 55m

Direct flights

Mon, Tue, Wed, Thu, Fri and Sat

Airports in Region of Ontario

3 airports
The best one-way flight to Region of Ontario from St. Louis in the past 72 hours is $80. The best round-trip flight deal from St. Louis to Region of Ontario found on momondo in the last 72 hours is $292.
The fastest flight from St. Louis to Region of Ontario takes 1h 55m
Direct flights go from St. Louis to Region of Ontario on Monday, Tuesday, Wednesday, Thursday, Friday and Saturday. Airlines offering direct flights are: United Airlines and Air Canada.
There are 3 airports near Region of Ontario: Ottawa (YOW), Montreal Pierre Elliott Trudeau Intl (YUL), Toronto Pearson Intl (YYZ)

  • 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?

  • 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?


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 CanadaPriceFrom $202Free CancellationRating
7.0
8,440 reviews
Search Air Canada flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
9,001 reviews
Search United Airlines flights
American AirlinesPriceFrom $304Free CancellationRating
7.2
10,000 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.


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