Are there nonstop flights from Osijek (OSI) to Zagreb (ZAG)?

Yes. Trade Air fly this route. Flight time is about 45m.

What is the fastest connection from Osijek (OSI) to Zagreb (ZAG)?

via Zadar ≈ 1h 35m, via Split ≈ 1h 38m, via Pula ≈ 1h 41m (estimated flying time, excluding layovers).

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

Osijek Airport (OSI) to Zagreb Franjo Tuđman International Airport (ZAG)・216 km

Nonstop flights available (1 airline). Flight time about 45m. Nonstop return flights also operate.

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

4 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.