Are there nonstop flights from Rome (FCO) to Ontario (ONT)?

No. The fastest connection is via Denver, about 13h 3m of total flying time.

What is the fastest connection from Rome (FCO) to Ontario (ONT)?

via Denver ≈ 13h 3m, via Chicago ≈ 13h 19m, via San Francisco ≈ 13h 31m (estimated flying time, excluding layovers).

from 27,500 ANA miles, from 45,000 JAL miles (economy, one way, based on the published award charts).

Rome–Fiumicino Leonardo da Vinci International Airport (FCO) to Ontario International Airport (ONT)・10,151 km

No nonstop flights. The fastest connection is via Denver (DEN), about 13h 3m of flying time (layover not included).

With milesANA 27,500 miles+ (via DEN)JAL 45,000 miles+ (via SEA)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

10 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.