One of the essential ways to save on airfare from Austin to Porto is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight at noon could potentially save you up to 22% on airfare.
Due to multiple factors, expect to potentially pay more when booking in March. For low rates, September can be a great choice for travel to Porto. Flights to Porto from Austin in September are about $854 on average during September, but can be found for as low as $423.
Friday is generally a great day to depart. Flying on this day could help you save up to 11%.