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 Austin as you normally would.
If you book a flight to Austin from Belfast City, you will be flying to Austin Bergstrom, which is the city’s only airport. Austin Bergstrom (AUS) is located 7.5 mi from the center of Austin. There are 0 flights from Belfast City to Austin Bergstrom per day from 2 different airlines.
Consider British Airways, Aer Lingus or United Airlines when booking your flight. These represent the most popular airlines when flying from Belfast City Airport to Austin.