$299 Cheap Delta flights Atlanta (ATL) to Ontario (ONT)

You can find cheap round-trip Delta Air Lines flights from $399 from ATL to ONT by sorting your results from “Price (lowest to highest)” on Expedia. Or search for deals from $299 for a one-way journey.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Delta Air Lines flights to Ontario are typically cheaper in the quieter months of January and April. Whether you need a return or one-way ticket, you could score a better deal then.

Begin your search one to three months ahead of your departure date to find cheap fares on Delta Air Lines flights from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Los Angeles - Ontario Intl. Airport (ONT). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also cut costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Get your timing spot on, and you can enjoy significant savings on domestic journeys.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Delta Air Lines has direct flights from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Los Angeles - Ontario Intl. Airport (ONT), with 14 departures each week. Simply choose the “Nonstop” and “Airline” filters while searching on Expedia to see all direct Delta Air Lines flights to ONT.

Take off from Hartsfield-Jackson Atlanta Intl. Airport (ATL) for Los Angeles - Ontario Intl. Airport (ONT) on a nonstop Delta Air Lines flight, and you’ll be in the air for around 4h 53m.

Delta Air Lines has the most flights from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Los Angeles - Ontario Intl. Airport (ONT) on Tuesday. With up to 2 daily departures, you’ll get the most flexibility on this day.

The first flight from ATL to ONT with Delta Air Lines leaves at 9:55AM UTC-5. You’ll land at 11:50AM UTC-8. The final Delta Air Lines flight of the day takes off at 8:59PM UTC-5 and arrives at 10:52PM UTC-8. With 20% fewer cancellations for early and mid-morning departures, starting your travel day early is usually the wisest option.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Delta Air Lines flights from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Ontario touch down at Los Angeles - Ontario Intl. Airport (ONT), Los Angeles Intl. Airport (LAX) and John Wayne Airport (SNA). The primary Ontario gateway serviced by this carrier is ONT. It’s worth exploring flights arriving at other nearby airports on Expedia as they may have cheaper tickets.

Delta Air Lines makes traveling from ATL to ONT more enjoyable with an excellent in-flight experience and a rewarding loyalty program. You even have the chance to collect points with Delta SkyMiles. Remember to join our free One Key™ rewards program to earn OneKeyCash™*, which can be redeemed on future bookings.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Delta Air Lines generally uses Airbus A321 planes for flights from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Los Angeles - Ontario Intl. Airport (ONT). Remember that aircraft type can change depending on operational needs, so the plane you’ll be on might be different on your day of travel.

You can usually cancel or change your flight, although there may be additional charges if your booking was made over 24 hours ago. Prefer to keep your options open? Use our “No cancel fee” and “Changes included” filters to find flights that won’t penalize you if you have to alter your plans. To make changes, go to “Trips,” select your flight and click on “Manage Booking” for further information.