Are there nonstop flights from Bangkok (BKK) to Barcelona (BCN)?

No. The fastest connection is via Sofia, about 12h 26m of total flying time.

What is the fastest connection from Bangkok (BKK) to Barcelona (BCN)?

via Sofia ≈ 12h 26m, via Rome ≈ 12h 27m, via Istanbul ≈ 12h 27m (estimated flying time, excluding layovers).

from 29,500 ANA miles, from 45,000 JAL miles (economy, one way, based on the published award charts).

Suvarnabhumi Airport (BKK) to Josep Tarradellas Barcelona-El Prat Airport (BCN)・9,714 km

No nonstop flights. The fastest connection is via Sofia (SOF), about 12h 26m of flying time (layover not included).

With milesANA 29,500 miles+ (via IST)JAL 45,000 miles+ (via AMM)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

34 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.