Are there nonstop flights from Niigata (KIJ) to Taipei (TPE)?

Yes. Tigerair Taiwan fly this route. Flight time is about 3h 6m.

What is the fastest connection from Niigata (KIJ) to Taipei (TPE)?

via Fukuoka ≈ 3h 37m, via Kobe ≈ 3h 37m, via Osaka ≈ 3h 37m (estimated flying time, excluding layovers).

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

Niigata Airport (KIJ) to Taiwan Taoyuan International Airport (TPE)・2,211 km

Nonstop flights available (1 airline). Flight time about 3h 6m. Nonstop return flights also operate.

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

7 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.