Are there nonstop flights from Batam (BTH) to Rengat-Sumatra Island (RGT)?

Yes. Susi Air fly this route. Flight time is about 48m.

Batam → Rengat-Sumatra Island

Hang Nadim International Airport (BTH) to Japura Airport (RGT)・257 km

Nonstop flights available (1 airline). Flight time about 48m. Nonstop return flights also operate.

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