ont-to-stl

 

The cheapest times to fly from ONT to STL are

  • January 8th to February 4th
  • April 23rd to May 6th
  • May 21st to June 10th
  • July 9th to July 22nd

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from ONT to STL is late October to early November. Prices can be as high as $1007 for Sunday flights during early to mid March, or as low as $285 for Tuesday flights around late October to early November.

 

When to Fly to St. Louis

Flying from Ontario, CA (ONT) to St. Louis, MO (STL) will usually cost between $295 to $580 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late October to early November with an average ticket price of $305. Due to high demand the most expensive time to fly is early to mid March, with an average price of $537. Planning your trip to low-cost times can easily save you $232 on economy flights and even more on first-class flights. Generally, any price below $391 can be considered a good price for a round-trip ONT to STL flight.

See below for a graph of average weekly prices for the ONT to STL route. All prices are for round-trip tickets in USD.

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ONT to STL Flight Prices

Compared to other flights, the ONT to STL flight is much cheaper than the average and costs much less than the average flight leaving from Ontario. The average price per mile (for a direct flight) is $0.16, which is far below average.

 

Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Sundays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $105 (23%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $352. Return trip prices are from the STL to ONT flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

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Departure Day Prices

Return Trip Prices by Day

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Return Day Prices

 

Nonstop Flights and Layovers

Travelers looking to fly from ONT to STL can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 3 hour 45 minutes may not be realistic.

 

Flight Questions Answered

Still have questions about flying from ONT to STL? We’ve got answers.

Which airlines fly this route?

You can find 6 major airlines flying this route most often: Alaska, American, Delta, Frontier, Southwest, United, and potentially more during busy seasons.

How far away is it from St Louis Lambert International Airport to Ontario International Airport?

The distance between the two airports is roughly 1542 miles or 2482 kilometers.

How long does it take to fly from ONT to STL?

The real-world flight time for a nonstop ONT to STL flight is about 3 hour 45 minutes.

How many flights go between Ontario, CA and St. Louis, MO?

It depends on the day of the week and the date, but a typical day might have around 79 available flights from ONT to STL.

 

Airport Location Info

 

Departing Airport

Origination code ONT
Origination airport name Ontario International Airport
City Ontario, CA
Country the United States
Latitude 34.1
Longitude -117.6

Return Airport

Destination code STL
Destination airport name St Louis Lambert International Airport
City St. Louis, MO
Country the United States
Latitude 38.7
Longitude -90.4

 

Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.