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Cheap flights from Ontario to St Louis (ONT - STL)

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The best prices from Ontario to St Louis are usually found in September or October, booked 37 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

$500
$410
$320
$229
Price
$229 - $449
Temperature
45 - 90 °F
Rainfall
2 - 5 inches
Most popular in January High demand for flights, 12% potential price rise
Cheapest in September Best time to find cheap flights, 3% potential price drop
Average price $449 Price for this month
Cheapest price $229 From Ontario to St Louis

Cheap flights from Ontario to St Louis in January 2020

The best prices found for ONT to STL flights for January
31 Jan - 3 Feb
$349pp
ONT
Ontario
United Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
United Airlines
 
1 STOP
ONT
Ontario
29 Jan - 30 Jan
$610pp
ONT
Ontario
United Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
United Airlines
 
1 STOP
ONT
Ontario
28 Jan - 2 Feb
$638pp
ONT
Ontario
Alaska Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Alaska Airlines
   
2 STOPS
ONT
Ontario

Ontario to St Louis 2020 flight deals

Cheap flights to St Louis from Ontario found for this year
27 Feb - 29 Feb
$237pp
ONT
Ontario
Frontier
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Frontier
 
1 STOP
ONT
Ontario
7 Apr - 11 Apr
$247pp
ONT
Ontario
Frontier
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Frontier
 
1 STOP
ONT
Ontario
2 Apr - 4 Apr
$252pp
ONT
Ontario
Frontier
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Frontier
 
1 STOP
ONT
Ontario

Last minute flights from Ontario to St Louis

Late deals on round-trip flights to St Louis from Ontario, departing today and this week
24 Jan - 27 Jan
$570pp
ONT
Ontario
United Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
United Airlines
 
1 STOP
ONT
Ontario
27 Jan - 31 Jan
$610pp
ONT
Ontario
United Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
United Airlines
 
1 STOP
ONT
Ontario
29 Jan - 2 Feb
$630pp
ONT
Ontario
American Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
American Airlines
   
2 STOPS
ONT
Ontario

Alternative routes for Ontario to St Louis

Destination information for St Louis

Things to know before you go. Useful info for your trip from Ontario to St Louis
Average temperature for January in St Louis
44.6 °F
Avg rainfall for January in St Louis
2.8 ″

Airports servicing Ontario

Airports servicing St. Louis

Related info for your journey

Useful info, stats and facts about Ontario to St Louis flights.

Flight FAQs

From Ontario to St Louis

What days are nonstop flights available from Ontario to St Louis?

Nonstop flights can be found on the following days: Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday.

How popular is this flight route?

This flight path from Ontario to Lambert-St Louis was viewed by 220 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

What percent of flights are delayed?

Airlines departing from Ontario to St Louis are usually on time.

How many passenger seats are available on a flight on this route?

77,170,891 passengers can be comfortably seated on when flying from Ontario to Lambert-St Louis on average per day.

What is the cheapest airline for this route?

The cheapest airline for this route is Southwest Airlines Co.. When flying this airline from Ontario to St Louis on average you can expect to find 167 flights available for this route daily.

Does it rain more in Ontario or St Louis?

In Ontario, there will be less rainfall in Ontario compared to St Louis over the next 8 days.

Is Ontario weather warmer or cooler than St Louis?

We forecast the temperature to be around the 95 °F's in July, on average. The temperature in St Louis is generally colder than in Ontario. Book flights in a timely manner in correlation to your departure date.