Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Miri to Gibraltar as you normally would.
For a flight from Miri to Gibraltar, you will be flying from Miri. Miri (MYY) is just 10.6 km from the centre of the city.
Great question - MYY to GIB just means Miri Airport to Gibraltar North Front Airport. Now you’ll know what these unique codes when you look for flights!