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Did you mean flights from St Louis to Ontario?

Cheap Flights from Ontario to St Louis, MO, United States - ONT to STL Last modified: Jul 2, 2016 1:32 AM

Popular flights from Ontario to St Louis Last modified: Jul 2, 2016 1:32 AM

We’ve got the inside scoop on finding the best time to fly for the best price. Not sure when to travel for your next vacation? Find details below on when-to-fly and when-to-buy.

American
ONTSTL
Tue 8/30
1 stop
STLONT
Wed 9/7
1 stop
$314
Select
American
ONTSTL
Thu 9/8
1 stop
STLONT
Thu 9/15
1 stop
$314
Select
American
ONTSTL
Sat 9/17
1 stop
STLONT
Sat 9/24
1 stop
$314
Select
American
ONTSTL
Wed 9/28
1 stop
STLONT
Wed 10/5
1 stop
$314
Select
American
ONTSTL
Thu 9/29
1 stop
STLONT
Sat 10/1
1 stop
$314
Select
United
ONTSTL
Wed 10/19
1 stop
STLONT
Wed 10/26
1 stop
$314
Select
Alaska
ONTSTL
Wed 9/21
1 stop
STLONT
Fri 9/30
1 stop
$462
Select

How Much Does it Cost to Fly from Ontario to St Louis (ONT to STL)?

We have collected flight cost data from across the web for travel from Ontario to St Louis, and have found the average flight price for this trip to be $346.

When Can I Buy the Cheapest Flight from Ontario to St Louis (ONT to STL)?

Airlines can adjust prices for plane tickets from Ontario to St Louis based on the day and time that you decide to book your flight. We have collected data from all airlines, and have discovered that the best days to book flights are Tuesdays, Wednesdays, and Saturdays. Read our article to find more information about the best time to buy airline tickets.

Cheapest Day To Fly from Ontario to St Louis

The chart below shows up-to-date information regarding the cheapest days to fly from Ontario to St Louis.

Monday Tuesday Wednesday Thursday Friday Saturday Sunday
$369 $314 $314 $314 $369 $314 $424

Round Trip vs One Way Flights from Ontario to St Louis (ONT to STL)

We have found that there is often no price difference between buying a round trip flight versus a one way flight. Increased flexibility is the main benefit when it comes to buying a one way flight from Ontario to St Louis. However, booking a round trip flight can be a simpler process. You can compare round trip and one way flights by using our flight comparison.

The average price for one way flights from Ontario to St Louis is $244.

The average price for round trip flights from Ontario to St Louis is $382.

Airports for Your Route

These pages contain information about the major airports in Ontario and St Louis, so you can feel comfortable knowing how to get around whether you are about to take off or you just landed.

Cheap Domestic Flights from Ontario - ONT

FlightsAirlineLowest Price
Ontario to Chicago American, Alaska, United $165

Cheap Domestic Flights to St Louis - STL

FlightsAirlineLowest Price
Los Angeles to St Louis American, Alaska, Frontier, United $244
San Diego to St Louis American, Alaska, Frontier, United $244
Las Vegas to St Louis American, Alaska, Frontier, United $126
Santa Ana to St Louis American, Alaska, United $278
Long Beach to St Louis American, Alaska, United $268
Palm Springs to St Louis American, Alaska, United $373
Santa Barbara to St Louis American, Alaska, United $354
Burbank to St Louis American, United $261
Bakersfield to St Louis American, United $383
San Diego to Chicago American, Alaska, Frontier, Spirit, United, Virgin America $92
Las Vegas to Chicago American, Alaska, Frontier, Spirit, United, Virgin America $137
Las Vegas to New York American, Alaska, JetBlue, Frontier, Spirit, Sun Country, United, Virgin America $241
Los Angeles to Houston American, Alaska, Frontier, Spirit, United $176
San Diego to Atlanta American, Alaska, Frontier, Spirit, United $318
Los Angeles to Detroit American, Alaska, JetBlue, Frontier, Spirit, United $244
Santa Ana to Chicago American, Alaska, Frontier, United $161
Los Angeles to Nashville American, Alaska, JetBlue, United $200
San Diego to Dallas - Ft Worth American, Alaska, Frontier, Spirit, United, Virgin America $91
Los Angeles to Indianapolis American, Alaska, JetBlue, Frontier, United $244
Las Vegas to Atlanta American, Alaska, Frontier, Spirit, United $186
Los Angeles to Minneapolis - St Paul American, Alaska, Frontier, Spirit, Sun Country, United $166
Las Vegas to Dallas - Ft Worth American, Alaska, Frontier, Spirit, United, Virgin America $80
Los Angeles to Kansas City American, Alaska, Frontier, Spirit, United $146
Los Angeles to Memphis American, Alaska, Frontier, United $216
Los Angeles to Orlando American, Alaska, JetBlue, Frontier, Spirit, Sun Country, United, Virgin America $212
Los Angeles to Charlotte American, Alaska, JetBlue, Frontier, United $240
Las Vegas to Los Angeles American, Spirit, United, Virgin America $76
Los Angeles to Phoenix American, Alaska, Spirit, United, Great Lakes $76

Cheap International Flights to St Louis - STL

FlightsAirlineLowest Price
Los Angeles to Toronto American, Air Canada, Alaska, JetBlue, Frontier, Sun Country, United, Virgin America, WestJet $384
Cheap Flights from Ontario to St Louis, MO, United States, from $314 Round trip from ONT to STL