Frontier recently announced an all-you-can-fly pass for $399 for unlimited flights this summer between May 2nd and September 30th. Frontier calls it "GoWild!" and this introduction comes at a great time as Frontier announced a large route expansion of flights to Puerto Rico. With only a limited number of passes available, those who are pass holders have access to unlimited flights throughout Frontier’s U.S. and international destinations.

The airline also has an annual pass option currently selling at $1,299 for the year.

There are stipulations to the program, however. Flights can be booked the day prior for domestic flights and international flights must be booked at least ten days prior. The flights are listed at 1 cent, however, this does not include the costs of selecting seats, in-flight snacks, checked bags, and other ancillary fees.