Are there nonstop flights from Bangkok (BKK) to Sofia (SOF)?

Yes. GullivAir fly this route. Flight time is about 9h 51m.

What is the fastest connection from Bangkok (BKK) to Sofia (SOF)?

via Istanbul ≈ 10h 23m, via Dubai ≈ 10h 53m, via Abu Dhabi ≈ 10h 58m (estimated flying time, excluding layovers).

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

Suvarnabhumi Airport (BKK) to Sofia Airport (SOF)・7,952 km

Nonstop flights available (1 airline). Flight time about 9h 51m. Nonstop return flights also operate.

With milesANA 29,500 miles+ (via IST)Economy, one way, estimate. Tap a connection for miles by cabin.

24 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.