Frontier’s discounted bag program will no longer be free starting July 1, so it's the last day to ensure as much savings as possible.
For those that don’t know: Frontier’s Discount Den discounts $5 off every carry-on and first checked bag fee when flying and booking on Frontier’s website. This makes the final price for a first checked bag $15 and a carry-on bag to $25 ($30 and $50 roundtrip, respectively, if paid during booking, even with the baggage "hikes"). It’s a super easy way to save $10 just in case you ever need to fly Frontier in the future, even if you don't think you will. I certainly didn't.
If you’re not enrolled in the program already, all you have to do is sign up for Frontier’s EarlyReturns program; existing EarlyReturns members are already enrolled.
UPDATE: Frontier seemed to discontinue the program but now it's back at $49.99 each year. Still too late if you missed it!