When flying from Bangkok to Hilo, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
If you book a flight to Hilo from Bangkok, you will be flying to Hilo Intl, which is the city’s only airport. Hilo Intl (ITO) is located 4.8 km from the centre of Hilo. There are 0 flights from Bangkok to Hilo Intl per day from 0 different airlines.