Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Londonderry to South Padre Island as you normally would.
For a flight from Londonderry to South Padre Island, you will be flying from Eglinton. Londonderry Eglinton (LDY) is just 6.7 mi from the center of the city. Eglinton is the only Londonderry airport and it handles 0 outbound flights to South Padre Island per day. 0 airlines have flights to South Padre Island from Londonderry Eglinton on a regular basis.