Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Miri to London Gatwick Airport as you normally would.
Located just 10.6 km from the city centre, Miri is the airport most travellers will use when flying to London Gatwick from Miri. Booking flights from Miri (MYY) to London Gatwick should be relatively easy as there are 0 daily outbound flights to London Gatwick from 0 different airlines.