Are there nonstop flights from Tehran (THR) to Gorgan (GBT)?

Yes. Iran Air, Iran Aseman Airlines, Qeshm Air, Pars Air, Kish Air, Pouya Air, List of airlines of Iran fly this route. Flight time is about 52m.

Tehran → Gorgan

Mehrabad International Airport (THR) to Gorgan Airport (GBT)・308 km

Nonstop flights available (7 airlines). Flight time about 52m. Nonstop return flights also operate.

Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.