Are there nonstop flights from San Diego (SAN) to Kumamoto (KMJ)?

No. The fastest connection is via Tokyo, about 12h 36m of total flying time.

What is the fastest connection from San Diego (SAN) to Kumamoto (KMJ)?

via Tokyo ≈ 12h 36m (estimated flying time, excluding layovers).

San Diego International Airport (SAN) to Kumamoto Airport (KMJ)・9,823 km

No nonstop flights. The fastest connection is via Tokyo (NRT), about 12h 36m 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.