$122 Cheap Delta flights Austin (AUS) to Ontario (ONT)

Scoring cheap one-way Delta Air Lines flights from AUS to ONT from $122 on Expedia is a cinch — just filter by "Price (lowest to highest)." Alternatively, check out our budget-friendly round-trip fares from $243 for your next getaway.**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.

Search for affordable Delta Air Lines flights from Austin-Bergstrom Intl. Airport (AUS) to Los Angeles - Ontario Intl. Airport (ONT) one to three months prior to your departure date. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. Regardless of fare class and journey, the ideal day to book a domestic flight is usually Sunday and the most expensive tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**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.

To find the earliest departures from AUS to ONT with Delta Air Lines, filter your search by "Early Morning" and "Morning." Choosing an early flight generally means you'll experience fewer cancellations.**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 makes traveling from AUS to ONT more comfortable with a rewarding loyalty program and an excellent in-flight experience. You even have the chance to collect points with Delta SkyMiles. Be sure to join Expedia's 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.