Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Belfast City Airport to Harrisburg as you normally would.
Located just 8.5 mi from the city center, Harrisburg is the airport most travelers will use when flying to Harrisburg from Belfast City. Booking flights from Belfast City to Harrisburg (MDT) should be relatively easy as there are 0 daily inbound flights from Belfast City from 0 different airlines.