Are there nonstop flights from Boston (BOS) to Nankoku (KCZ)?

No. The fastest connection is via Tokyo, about 14h 27m of total flying time.

What is the fastest connection from Boston (BOS) to Nankoku (KCZ)?

via Tokyo ≈ 14h 27m (estimated flying time, excluding layovers).

Boston Logan International Airport (BOS) to Kochi Ryoma Airport (KCZ)・11,208 km

No nonstop flights. The fastest connection is via Tokyo (NRT), about 14h 27m of flying time (layover not included).

None.

1 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.