Are there nonstop flights from Atlanta (ATL) to Ontario (ONT)?

Yes. Delta Air Lines fly this route. Flight time is about 4h 5m.

What is the fastest connection from Atlanta (ATL) to Ontario (ONT)?

via Phoenix ≈ 4h 37m, via Dallas-Fort Worth ≈ 4h 38m, via Dallas ≈ 4h 38m (estimated flying time, excluding layovers).

from 15,000 JAL miles, from 15,000 ANA miles (economy, one way, based on the published award charts).

Hartsfield Jackson Atlanta International Airport (ATL) to Ontario International Airport (ONT)・3,050 km

Nonstop flights available (1 airline). Flight time about 4h 5m. Nonstop return flights also operate.

With milesJAL 15,000 miles+ (via PHX)ANA 15,000 miles+ (via DEN)Economy, one way, estimate. Tap a connection for miles by cabin.

23 one-stop options, sorted by estimated flying time. Tap one to see the airlines on each leg and booking links.

Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.