When flying from Miri to Kampala, 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 Kampala from Miri, you will be flying from Miri, which is the city’s only airport. Miri (MYY) is located 10.6 km from the centre of Miri. There are 0 flights from Miri to Kampala per day from 0 different airlines.