Are there nonstop flights from Ishigaki (ISG) to Sapporo (CTS)?

No. The fastest connection is via Fukuoka, about 4h 4m of total flying time.

What is the fastest connection from Ishigaki (ISG) to Sapporo (CTS)?

via Fukuoka ≈ 4h 4m, via Osaka ≈ 4h 5m, via Okinawa (Naha) ≈ 4h 6m (estimated flying time, excluding layovers).

from 15,000 ANA miles, from 18,000 JAL miles (economy, one way, based on the published award charts).

New Ishigaki Airport (ISG) to New Chitose Airport (CTS)・2,594 km

No nonstop flights. The fastest connection is via Fukuoka (FUK), about 4h 4m of flying time (layover not included).

With milesANA 15,000 miles+ (via KIX)JAL 18,000 miles+ (via KIX)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

10 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.