Yes, you can go to the airport to change your flight, but in 2026, it is generally the least efficient way to do so. While a ticket agent at the "Full Service" counter can manually rebook you, they are often restricted by the same fare rules and "change fees" that apply online. In many cases, "Airport Standby" or "Same-Day Confirmed" changes are actually easier to handle via the airline's mobile app or a self-service kiosk, which are designed to process these transactions instantly. Going to the counter is best reserved for complex situations, such as missed connections due to weather or issues with a paper voucher that the app can't read. Be aware that many low-cost carriers (like Spirit or Ryanair) may charge an additional "Agent Service Fee" for any task that could have been done digitally. Unless you are already at the airport for a flight, your best bet is to use the app or call the "Elite" member line if you have status, as this saves you the time and cost of parking and navigating the terminal.