The cheapest day to book Frontier Airlines flightsโ is typically Tuesday or Wednesday (+๐-๐ ๐ ๐ -๐๐๐-๐ก๐๐๐). Airlines, including Frontier Airlines, often release deals early in the week ๐+๐-๐ ๐ ๐ -๐๐๐-๐ก๐๐๐ (United States), making these days ideal for budget travelers
