Are there nonstop flights from Rome (FCO) to Bangkok (BKK)?

Yes. ITA Airways fly this route. Flight time is about 10h 57m.

What is the fastest connection from Rome (FCO) to Bangkok (BKK)?

via Sofia ≈ 11h 26m, via New Delhi ≈ 11h 27m, via Istanbul ≈ 11h 27m (estimated flying time, excluding layovers).

from 29,500 ANA miles, from 37,000 JAL miles (economy, one way, based on the published award charts).

Rome–Fiumicino Leonardo da Vinci International Airport (FCO) to Suvarnabhumi Airport (BKK)・8,876 km

Nonstop flights available (1 airline). Flight time about 10h 57m. Nonstop return flights also operate.

With milesANA 29,500 miles+ (via DEL)JAL 37,000 miles+ (via AMM)Economy, one way, estimate. Tap a connection for miles by cabin.

46 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.