Are there nonstop flights from Bangkok (BKK) to Nakhon Si Thammarat (NST)?

Yes. Thai AirAsia, Thai Vietjet Air fly this route. Flight time is about 1h 11m.

Bangkok → Nakhon Si Thammarat

Suvarnabhumi Airport (BKK) to Nakhon Si Thammarat Airport (NST)・578 km

Nonstop flights available (2 airlines). Flight time about 1h 11m. Nonstop return flights also operate.

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