Are there nonstop flights from Kota Kinabalu (BKI) to Hangzhou (HGH)?

Yes. AirAsia fly this route. Flight time is about 3h 43m.

What is the fastest connection from Kota Kinabalu (BKI) to Hangzhou (HGH)?

via Xiamen ≈ 4h 14m, via Taipei ≈ 4h 16m, via Manila ≈ 4h 22m (estimated flying time, excluding layovers).

from 18,000 ANA miles (economy, one way, based on the published award charts).

Kota Kinabalu International Airport (BKI) to Hangzhou Xiaoshan International Airport (HGH)・2,741 km

Nonstop flights available (1 airline). Flight time about 3h 43m. Nonstop return flights also operate.

With milesANA 18,000 miles+ (via ICN)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.