Are there nonstop flights from Taipei (TPE) to Kota Kinabalu (BKI)?

Yes. AirAsia fly this route. Flight time is about 3h 5m.

What is the fastest connection from Taipei (TPE) to Kota Kinabalu (BKI)?

via Manila ≈ 3h 41m, via Xiamen ≈ 3h 50m, via Fuzhou ≈ 3h 52m (estimated flying time, excluding layovers).

from 23,000 JAL miles (economy, one way, based on the published award charts).

Taiwan Taoyuan International Airport (TPE) to Kota Kinabalu International Airport (BKI)・2,199 km

Nonstop flights available (1 airline). Flight time about 3h 5m. Nonstop return flights also operate.

With milesJAL 23,000 miles+ (via KUL)Economy, one way, estimate. Tap a connection for miles by cabin.

17 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.