$209 Cheap American Airlines flights Ontario (ONT) to Atlanta (ATL)

Scoring cheap one-way American Airlines flights from ONT to ATL from $209 on Expedia couldn't be easier — just filter by "Price (lowest to highest)." Alternatively, check out our affordable return fares from $319 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.

Look for affordable American Airlines flights from Los Angeles - Ontario Intl. Airport (ONT) to Hartsfield-Jackson Atlanta Intl. Airport (ATL) one to three months ahead of 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 itinerary, the ideal day to book a domestic flight is generally Sunday and the most expensive is typically Monday. Passengers who book on a Sunday can save 6% on average compared to those who book 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.

Search American Airlines's earliest flights from ONT to ATL by selecting the "Morning" and "Early Morning" filters. Not only will you arrive sooner, early departures also have a 20% less chance of being canceled.**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.