Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Belfast Intl Airport to Innsbruck as you normally would.
Located just 2.4 mi from the city center, Innsbruck Kranebitten is the airport most travelers will use when flying to Innsbruck from Belfast Intl. Booking flights from Belfast Intl to Kranebitten (INN) should be relatively easy as there are 0 daily inbound flights from Belfast Intl from 0 different airlines.