STL to ONT (St. Louis to Ontario) Flights

Last Minute Flights from STL to ONT

Best airfare and ticket deals for STL to ONT flights are based on recent deals found by Expedia.com customers within the past 7 days.

OriginDestinationTravel DatesFlights From*
STLLos AngelesApril 27 to April 30$228
*Prices include taxes and fees

Cheapest STL to ONT Flights

Best airfare and ticket deals for STL to ONT flights are based on recent deals found by Expedia.com customers within the past 7 days.

OriginDestinationTravel DatesFlights From*
STLLos AngelesMay 18 to May 19$96
STLLos AngelesAugust 20 to August 21$341
STLLos AngelesAugust 20 to August 21$344
STLLos AngelesAugust 20 to August 21$344
*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

Which airlines with flights from STL to ONT allow free cancellation due to COVID-19?
To locate the airlines that allow COVID-19 related changes, use our convenient filter tool. Get started by typing in your preferred flight details. Then, once all the available flights have appeared, check the “No change fee” box under “Flexible change policies” on the left. Familiarize yourself with the air carrier’s cancellation rules before booking your St. Louis, MO Airport (STL-Lambert-St. Louis Intl.) to Ontario, CA Airport (ONT-Los Angeles - Ontario Intl.) airfare.
What airlines fly direct from St. Louis, MO Airport (STL-Lambert-St. Louis Intl.) to ONT?
To travel from St. Louis, MO Airport (STL-Lambert-St. Louis Intl.) to Ontario, CA Airport (ONT-Los Angeles - Ontario Intl.), you’ll have to hop on a flight with at least one stop. Unfortunately, there are no nonstop services on this particular route.
How many flights are there from STL to ONT?
There are around 56 flights a day from St. Louis, MO Airport (STL-Lambert-St. Louis Intl.) to Ontario, CA Airport (ONT-Los Angeles - Ontario Intl.), so you have plenty of ways to get to Los Angeles. Just select a time and date that matches your schedule and secure your airfare.
How long does it take to fly from St. Louis, MO Airport (STL-Lambert-St. Louis Intl.) to Ontario, CA Airport (ONT-Los Angeles - Ontario Intl.)?
You can expect to be on the plane for about 5 hours and 28 minutes from St. Louis, MO Airport (STL-Lambert-St. Louis Intl.) to Ontario, CA Airport (ONT-Los Angeles - Ontario Intl.), so pick comfy clothes to wear. Oversized sweaters, loose, wide-leg pants and slip-on sneakers are all excellent choices for a flight of this length.
What is the flight distance from St. Louis, MO Airport (STL-Lambert-St. Louis Intl.) to Ontario, CA Airport (ONT-Los Angeles - Ontario Intl.)?
Approximately 1550 miles (2500 km). If you travel regularly and have gathered lots of air miles, this medium-haul journey may be the ideal time for a seating upgrade.
How many morning flights are there from STL to ONT?
Early risers — you’ll be relieved to discover that there are 192 morning flights from STL to ONT every week.
  • Southwest Airlines (WN) has around 68 weekly flights departing before noon. The earliest is 6:00AM.
  • American Airlines (AA) is another good option to consider. This carrier has 66 morning flights, with the earliest scheduled for takeoff at 5:20AM.
  • Fly before midday with United Airlines (UA) and you’ll have approximately 28 flights per week to take your pick of. 6:00AM is the first of the day from STL to ONT.
How many afternoon flights are there from STL to ONT?
If the words “crack of dawn” just aren’t part of your daily vocab, jump on one of the 204 weekly afternoon and evening flights from STL to ONT.
  • Consider reserving your ticket with Southwest Airlines (WN). It offers 76 flights per week that depart after noon. The earliest departs at 12:30PM.
  • If you’d like to make a booking with American Airlines (AA), look up the 48 weekly afternoon and evening flights that depart from 12:50PM onward.
  • Alternatively, cruise at altitude with Delta (DL). This carrier has 37 weekly flights after midday, with the earliest departure at 1:16PM.
What is the earliest departure time out of St. Louis to Los Angeles?
Fly out of STL at 5:20AM and arrive at ONT at 12:03AM. This is the earliest departure you can catch on this route.
What is the latest departure time out of St. Louis to Los Angeles?
The latest flight is scheduled to depart STL at 10:15PM and touches down at ONT at 2:35PM. You’ll have plenty of time to get ready for this flight.
What is the average price from St. Louis to Los Angeles?
Round-trip journeys from STL to ONT start from around $96. Awesome deals don’t last forever, so be prepared to hit “book” when you see a bargain. 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 Flight Schedule

CarrierFlightDepart STLArrive ONTFri
4/26		Sat
4/27		Sun
4/28		Mon
4/29		Tue
4/30		Wed
5/1		Thu
5/2		Stops
F9456708:04 pm11:59 pm
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1 Stops

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 perhaps simply to treat yourself to a mini vacation. Regardless of the reasons behind packing your bags and needing to find the cheapest flights from STL to ONT, we’ve got you covered here at Flights.com.

We present you with some of the hottest 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.