Are there nonstop flights from Phnom Penh (KTI) to Ta Noun (DSY)?

Yes. Air Cambodia, Cambodia Airways fly this route. Flight time is about 43m.

Phnom Penh → Ta Noun

Techo International Airport (KTI) to Dara Sakor International Airport (DSY)・191 km

Nonstop flights available (2 airlines). Flight time about 43m. Nonstop return flights also operate.

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