Are there nonstop flights from Jakarta (CGK) to Kota Baharu (KBR)?

Yes. AirAsia fly this route. Flight time is about 2h 12m.

What is the fastest connection from Jakarta (CGK) to Kota Baharu (KBR)?

via Singapore ≈ 2h 42m, via Johor Bahru ≈ 2h 42m, via Kuala Lumpur ≈ 2h 47m (estimated flying time, excluding layovers).

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

Soekarno-Hatta International Airport (CGK) to Sultan Ismail Petra Airport (KBR)・1,450 km

Nonstop flights available (1 airline). Flight time about 2h 12m. 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.