Are there nonstop flights from Higashine (GAJ) to Seoul (ICN)?

No. The fastest connection is via Tokyo, about 2h 48m of total flying time.

What is the fastest connection from Higashine (GAJ) to Seoul (ICN)?

via Tokyo ≈ 2h 48m, via Sapporo ≈ 3h 15m (estimated flying time, excluding layovers).

Yamagata Airport (GAJ) to Incheon International Airport (ICN)・1,224 km

No nonstop flights. The fastest connection is via Tokyo (HND), about 2h 48m 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.