Join Date: Jan 2011
Location: STL/ORD/MCI/SAN
Programs: AA CK MM, AC SE100K, BA Gold, UA 1K, DL Plat, Hyatt Globalist, Hilton Diamond, Marriott Platinum
Posts: 1,990
I recently bought a walk-up ticket at the counter at TPA (similar situation when I cancelled a reservation on another airline), and I was within two hours of the flight's departure time. I wasn't charged any additional fee.