Are there nonstop flights from Yoron (RNJ) to Seoul (ICN)?

No. The fastest connection is via Kagoshima, about 2h 33m of total flying time.

What is the fastest connection from Yoron (RNJ) to Seoul (ICN)?

via Kagoshima ≈ 2h 33m, via Okinawa (Naha) ≈ 2h 38m (estimated flying time, excluding layovers).

Yoron Airport (RNJ) to Incheon International Airport (ICN)・1,174 km

No nonstop flights. The fastest connection is via Kagoshima (KOJ), about 2h 33m of flying time (layover not included).

None.

2 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.