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Cheap Flights from Ontario to St Louis, MO, United States - ONT to STL

Popular flights from Ontario to St Louis

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.

Alaska Airlines
Departure Date Return Date Lowest Price
May 25, 2016 Jun 4, 2016 $410
American Airlines
Departure Date Return Date Lowest Price
May 28, 2016 Jun 1, 2016 $292
May 29, 2016 Jun 4, 2016 $292
Jun 1, 2016 Jun 15, 2016 $292
Jun 4, 2016 Jun 11, 2016 $292
United Airlines
Departure Date Return Date Lowest Price
Jun 1, 2016 Jun 8, 2016 $312

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 $326.

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
$360 $346 $292 $346 $355 $292 $292

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 $186.

The average price for round trip flights from Ontario to St Louis is $349.

Ontario to St Louis Flight Questions

Below are some common questions that asked about this flight route:

Question: What are the most popular connecting cities when flying from Ontario to St Louis?
Answer: Denver, CO

Airlines Flying from Ontario to St Louis (ONT to STL)

Below are the different airlines that fly from Ontario to St Louis with the average price of their plane tickets. Just remember that different airlines offer different levels of comfort and service, so consider convenience when choosing your airline.

Below is the full flight schedule summary of the next 30 days for flights from Ontario to St Louis.

Ontario to St Louis
Airline Connections Mon Tue Wed Thu Fri Sat Sun
American PHX X X X X X X X
Alaska SEA X X X X X
Delta SLC X X X X X X X
Delta SLC / ATL X X X X X X X
United SFO X X X X X X X
Southwest DEN X X X X X X X

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 $244

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, United $270
Las Vegas to St Louis American, Alaska, Frontier, United $123
Santa Ana to St Louis American, Alaska, United $280
Long Beach to St Louis American, Alaska, United $351
Palm Springs to St Louis American, Alaska, United $388
Santa Barbara to St Louis American, Alaska, United $420
Burbank to St Louis American, United $398
Bakersfield to St Louis American, United $492
San Diego to Chicago American, Alaska, Frontier, Spirit, United, Virgin America $182
Las Vegas to Chicago American, Alaska, Frontier, Spirit, United, Virgin America $97
Las Vegas to New York American, Alaska, JetBlue, Spirit, Sun Country, United, Virgin America $237
Los Angeles to Houston American, Alaska, Spirit, United $197
San Diego to Atlanta American, Alaska, JetBlue, Frontier, Spirit, United $345
Los Angeles to Detroit American, Alaska, JetBlue, Frontier, Spirit, United $237
Santa Ana to Chicago American, Alaska, Frontier, United $190
Los Angeles to Nashville American, Alaska, Frontier, United $261
San Diego to Dallas - Ft Worth American, Alaska, Spirit, United, Virgin America $107
Los Angeles to Indianapolis American, Alaska, Frontier, United $204
Las Vegas to Atlanta American, Alaska, Frontier, Spirit, United $158
Los Angeles to Minneapolis - St Paul American, Alaska, Frontier, Spirit, Sun Country, United $207
Las Vegas to Dallas - Ft Worth American, Alaska, Frontier, Spirit, United, Virgin America $81
Los Angeles to Kansas City American, Alaska, Spirit, United $157
Los Angeles to Memphis American, Alaska, United $278
Los Angeles to Orlando American, Alaska, JetBlue, Frontier, Spirit, Sun Country, United, Virgin America $187
Los Angeles to Charlotte American, Alaska, JetBlue, United $390
Las Vegas to Los Angeles American, Alaska, Spirit, United, Virgin America $70
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, Spirit, Sun Country, United, Virgin America, WestJet, Great Lakes $360
Cheap Flights from Ontario to St Louis, MO, United States, from $292 Round trip from ONT to STL