Are there nonstop flights from Trincomalee (TRR) to Colombo (RML)?

Yes. FitsAir, Helitours fly this route. Flight time is about 47m.

Trincomalee → Colombo

China Bay Airport (TRR) to Colombo Ratmalana International Airport (RML)・238 km

Nonstop flights available (2 airlines). Flight time about 47m. Nonstop return flights also operate.

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