Are there nonstop flights from Obihiro (OBO) to Seoul (ICN)?

No. The fastest connection is via Nagoya, about 3h 22m of total flying time.

What is the fastest connection from Obihiro (OBO) to Seoul (ICN)?

via Nagoya ≈ 3h 22m, via Tokyo ≈ 3h 25m (estimated flying time, excluding layovers).

Tokachi-Obihiro Airport (OBO) to Incheon International Airport (ICN)・1,538 km

No nonstop flights. The fastest connection is via Nagoya (NGO), about 3h 22m 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.