Are there nonstop flights from Cologne (CGN) to Gaziantep (GZT)?

Yes. Pegasus Airlines fly this route. Flight time is about 3h 51m.

What is the fastest connection from Cologne (CGN) to Gaziantep (GZT)?

via Ankara ≈ 4h 21m, via Istanbul ≈ 4h 22m, via Istanbul ≈ 4h 22m (estimated flying time, excluding layovers).

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

Cologne Bonn Airport (CGN) to Gaziantep Oğuzeli International Airport (GZT)・2,850 km

Nonstop flights available (1 airline). Flight time about 3h 51m. Nonstop return flights also operate.

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

11 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.