Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Bristol to South Padre Island as you normally would.
Bristol (BRS) is the airport you will fly out of if you book a flight from Bristol to South Padre Island. You should not have trouble finding flights to South Padre Island from Bristol; the airport handles an average of 0 outbound flights to South Padre Island per day. You should also have plenty of airline options to choose from since 0 airlines have flights from the Bristol airport to South Padre Island. It is only a 7.4 mi journey to Bristol (BRS) from Bristol’s city center.