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 Lerwick Sumburgh Airport as you normally would.
Located just 19.7 mi from the city center, Lerwick Sumburgh is the airport most travelers will use when flying to Lerwick from Belfast City. Booking flights from Belfast City to Sumburgh (LSI) should be relatively easy as there are 0 daily inbound flights from Belfast City from 1 airline.