STL to ONT (St. Louis to Ontario) Flights

Last Minute Flights from STL to ONT

Price found within the past 7 days for the specified period. Click for updated prices.

OriginDestinationTravel DatesFlights From*
STLLos AngelesMarch 15 to March 17$316
*Prices include taxes and fees

Cheapest STL to ONT Flights

Price found within the past 7 days for the specified period. Click for updated prices.

OriginDestinationTravel DatesFlights From*
STLLos AngelesApril 16 to April 20$190
STLLos AngelesApril 2 to April 3$313
STLLos AngelesMarch 30 to April 5$313
STLLos AngelesApril 1 to April 8$313
STLLos AngelesMarch 30 to April 5$313
*Prices include taxes and fees
STL to ONT Flight Details
Origin airport
Lambert-St. Louis Intl.
Origin airport IATA code
STL
Destination airport
Los Angeles - Ontario Intl.
Destination airport IATA code
ONT
Distance
1541 mi

Frequently asked questions

What airlines fly direct from Lambert-St. Louis Intl. Airport (STL) to ONT?
Unfortunately, there aren't any air carriers flying straight from Lambert-St. Louis Intl. Airport (STL) to Los Angeles - Ontario Intl. Airport (ONT). If you want to reach Ontario, search for a trip with one or more stops.
How many flights are there from STL to ONT?
There are approximately 29 flights a day from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.), so you have no shortage of ways to get to Ontario. Just pick a date that fits with your plans and secure your airfare.
How long does it take to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
You'll be aboard the plane for about 5 hours and 27 minutes from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.), so dress in comfortable clothing. Oversized sweaters, stretchy pants and flat shoes are excellent choices for a flight of this duration.
What is the flight distance from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
A device filled with cool things to watch will help while away time on this medium-haul trip of 1,550 miles (2,500 1). While you'll probably have some in-flight entertainment, nothing beats having your favorite shows downloaded and ready to go.
How many morning flights are there from STL to ONT?
Those who like to rise early can select from 103 morning flights from STL to ONT a week.

  • American Airlines (AA) has 56 weekly services that jet out before noon. The earliest to depart is 5:00AM.
  • Alternatively, book a ticket with Delta Air Lines (DL) and take off as early as 5:36AM. This company operates 32 morning flights per week between STL and ONT.

How many afternoon flights are there from STL to ONT?
Take to the skies on one of the 103 afternoon and evening flights from STL to ONT per week.

  • American Airlines (AA) has 35 weekly flights that take off after midday. The earliest departs at 1:01PM.
  • Delta Air Lines (DL) provides 30 afternoon and evening flights a week. The first is at 12:53PM.
  • Alternatively, pack your suitcase and go with Frontier Airlines (F9). This carrier has 17 flights per week after midday, with the earliest leaving at 12:39PM.

What is the earliest departure time out of St. Louis to Ontario?
5:00AM is the first flight taking off from STL, touching down at ONT at 1:57AM. Save precious minutes in the morning by having your bags zipped up and ready to be bundled into your ride.
What is the latest departure time out of St. Louis to Ontario?
Lock in a seat on the 10:59PM flight out of STL, touching down at ONT at 7:03AM, and give yourself time to finish up those last-minute vacation preparations. This is the latest flight you can take on this route.
What is the average price from St. Louis to Ontario?
Round-trip journeys for this route begin from around $190. When you're ready to jet off, we're ready to help you score the best deal in town. This price was available on Flights.com within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

St. Louis to Ontario Flights

Whether it’s for an obligation or the sake of your sanity, sometimes you need to get away. Maybe you need flights from St. Louis to Ontario to attend your cousin’s wedding, to pitch a business idea to your boss, or simply treat yourself to a mini vacation. Regardless of the reasons behind packing your bags and needing to find our cheapest flights from STL to ONT, we’ve got you covered here at Flights.com.

We present you with some of the most affordable deals on airfare, so stop that Google flights search. We want you to spend less on your flight from St. Louis to Ontario, so you can spend more during your getaway. With Flights.com, you’ll find it simple to land airline tickets with itineraries matching your travel schedule. What’s more, we provide you with all the information you need to confidently make reservations on your family, business, or personal trip.

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