Good news!! If you are looking to travel this summer well this may be the perfect time to become part of the Frontier family! When you join Frontiers membership program for $59.99 you will have access to the best rates for yourself and additional passengers, up to 6. You will also get the perk of children flying for free! Anyone 14 and under can fly for free with an adult ticket! Some fine print, you must fly certain days to destinations within the U.S. The deal will work for select dates in February and go until August for now.. Summer vacation may be based around free travel days, that’s for sure!