Are there nonstop flights from Seoul (ICN) to Sanya (SYX)?

Yes. Shandong Airlines fly this route. Flight time is about 3h 41m.

What is the fastest connection from Seoul (ICN) to Sanya (SYX)?

via Guangzhou ≈ 4h 11m, via Wuxi ≈ 4h 11m, via Hangzhou ≈ 4h 11m (estimated flying time, excluding layovers).

from 11,000 ANA miles, from 15,000 JAL miles (economy, one way, based on the published award charts).

Incheon International Airport (ICN) to Sanya Phoenix International Airport (SYX)・2,701 km

Nonstop flights available (1 airline). Flight time about 3h 41m. Nonstop return flights also operate.

With milesANA 11,000 miles+ (via SZX)JAL 15,000 miles+ (via WUX)Economy, one way, estimate. Tap a connection for miles by cabin.

39 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.