Are there nonstop flights from Haikou (HAK) to Seoul (ICN)?

Yes. Hainan Airlines fly this route. Flight time is about 3h 26m.

What is the fastest connection from Haikou (HAK) to Seoul (ICN)?

via Guangzhou ≈ 3h 56m, via Wuxi ≈ 3h 56m, via Hangzhou ≈ 3h 56m (estimated flying time, excluding layovers).

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

Haikou Meilan International Airport (HAK) to Incheon International Airport (ICN)・2,489 km

Nonstop flights available (1 airline). Flight time about 3h 26m. Nonstop return flights also operate.

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

46 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.