June 29, 2011 No Comments 1,000 Free Frontier Airlines EarlyReturns Miles For a limited time, earn 1,000 bonus miles when you sign up for EarlyReturns. Offer valid through August 31, 2011. 1,000 Free Frontier Airlines EarlyReturns Miles – EXPIRED Facebook Twitter Add Comment Notify me of follow-up comments by email. Notify me of new posts by email.