Are there nonstop flights from Kota Baharu (KBR) to Kuching (KCH)?

Yes. AirAsia fly this route. Flight time is about 1h 43m.

What is the fastest connection from Kota Baharu (KBR) to Kuching (KCH)?

via Johor Bahru ≈ 2h 29m, via Singapore ≈ 2h 30m, via Subang ≈ 2h 35m (estimated flying time, excluding layovers).

from 12,000 JAL miles (economy, one way, based on the published award charts).

Sultan Ismail Petra Airport (KBR) to Kuching International Airport (KCH)・1,034 km

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

With milesJAL 12,000 miles+ (via KUL)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.