I actually learned about Frontier’s Discount Den by accident when booking a last-minute trip to Denver. The fares were crazy high, but then I saw this option for members that cut the price almost in half. I signed up on the spot and ended up saving more than the membership cost on that one trip. A few weeks later, my plans changed and I had to switch flights — honestly, I thought it would be a nightmare. But I just called 844-734-0813, and they walked me through the change in minutes. Way less stressful than trying to figure it out online. If you fly Frontier even a couple times a year, the Discount Den pays for itself, and that number is hands-down the fastest way to book, cancel, or modify flights.