Are there nonstop flights from Nanjing (NKG) to Jeju City (CJU)?

Yes. Spring Airlines, Juneyao Air fly this route. Flight time is about 1h 22m.

What is the fastest connection from Nanjing (NKG) to Jeju City (CJU)?

via Shanghai ≈ 1h 56m, via Busan ≈ 2h 32m, via Seoul ≈ 2h 37m (estimated flying time, excluding layovers).

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

Nanjing Lukou International Airport (NKG) to Jeju International Airport (CJU)・741 km

Nonstop flights available (2 airlines). Flight time about 1h 22m. Nonstop return flights also operate.

With milesJAL 12,000 miles+ (via PVG)Economy, one way, estimate. Tap a connection for miles by cabin.

6 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.