Are there nonstop flights from Bangkok (BKK) to Sendai (SDJ)?

No. The fastest connection is via Fukuoka, about 6h 39m of total flying time.

What is the fastest connection from Bangkok (BKK) to Sendai (SDJ)?

via Fukuoka ≈ 6h 39m, via Hong Kong ≈ 6h 39m, via Shanghai ≈ 6h 39m (estimated flying time, excluding layovers).

from 17,500 ANA miles (economy, one way, based on the published award charts).

Suvarnabhumi Airport (BKK) to Sendai Airport (SDJ)・4,794 km

No nonstop flights. The fastest connection is via Fukuoka (FUK), about 6h 39m of flying time (layover not included).

With milesANA 17,500 miles+ (via NGO)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.