Are there nonstop flights from Taipei (TPE) to Kumamoto (KMJ)?

Yes. China Airlines, Starlux Airlines fly this route. Flight time is about 2h.

What is the fastest connection from Taipei (TPE) to Kumamoto (KMJ)?

via Okinawa (Naha) ≈ 2h 43m, via Busan ≈ 2h 57m, via Seoul ≈ 3h 29m (estimated flying time, excluding layovers).

from 10,000 ANA miles, from 15,000 JAL miles (economy, one way, based on the published award charts).

Taiwan Taoyuan International Airport (TPE) to Kumamoto Airport (KMJ)・1,272 km

Nonstop flights available (2 airlines). Flight time about 2h. Nonstop return flights also operate.

With milesANA 10,000 miles+ (via OKA)JAL 15,000 miles+ (via ICN)Economy, one way, estimate. Tap a connection for miles by cabin.

6 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.