Are there nonstop flights from Seoul (ICN) to Tonghua (TNH)?

No. The fastest connection is via Dalian, about 2h 7m of total flying time.

What is the fastest connection from Seoul (ICN) to Tonghua (TNH)?

via Dalian ≈ 2h 7m, via Yantai ≈ 2h 19m, via Harbin ≈ 2h 32m (estimated flying time, excluding layovers).

Incheon International Airport (ICN) to Tonghua Sanyuanpu Airport (TNH)・513 km

No nonstop flights. The fastest connection is via Dalian (DLC), about 2h 7m of flying time (layover not included).

None.

3 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.