Are there nonstop flights from Kos (KGS) to Grenoble (GNB)?

No. The fastest connection is via Warsaw, about 4h 42m of total flying time.

What is the fastest connection from Kos (KGS) to Grenoble (GNB)?

via Warsaw ≈ 4h 42m, via Rotterdam ≈ 4h 45m, via London ≈ 5h 3m (estimated flying time, excluding layovers).

from 23,000 JAL miles (economy, one way, based on the published award charts).

Kos International Airport "Ippokratis" (KGS) to Grenoble Alpes Isère Airport (GNB)・2,049 km

No nonstop flights. The fastest connection is via Warsaw (WAW), about 4h 42m of flying time (layover not included).

With milesJAL 23,000 miles+ (via LGW)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

12 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.