Are there nonstop flights from Kota Kinabalu (BKI) to Guangzhou (CAN)?

Yes. China Southern Airlines, AirAsia fly this route. Flight time is about 2h 49m.

What is the fastest connection from Kota Kinabalu (BKI) to Guangzhou (CAN)?

via Hong Kong ≈ 3h 20m, via Haikou ≈ 3h 32m, via Manila ≈ 3h 48m (estimated flying time, excluding layovers).

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

Kota Kinabalu International Airport (BKI) to Guangzhou Baiyun International Airport (CAN)・1,964 km

Nonstop flights available (2 airlines). Flight time about 2h 49m. 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.