A simple way to change or cancel a flight without paying a fee is to do so within 24 hours of booking. After this window, the next option is to wait to see if the airline makes a change to the flight — the departure time, the aircraft, etc. — which will automatically grant you a refund if you change or cancel.

Whether you can cancel a flight for free depends on the "24-hour rule," your ticket type, and your location. In the United States, the Department of Transportation (DOT) mandates that airlines must allow passengers to cancel a booking within 24 hours of purchase for a full refund, provided the ticket was booked at least seven days before departure. Many airlines extend this policy even if the flight is sooner. Beyond this window, most "Basic Economy" or "Non-refundable" tickets cannot be canceled for a cash refund; instead, you may receive a Future Travel Credit minus a cancellation fee (though many major U.S. carriers eliminated these fees in 2020 for standard economy tickets). If the airline cancels your flight or makes a "significant" schedule change (usually 3+ hours), you are legally entitled to a full cash refund regardless of your ticket type. In early 2026, some regions like India have introduced even more flexible "look-in" periods (up to 48 hours). Always check the "Fare Rules" during booking, and consider "Refundable" fares or travel insurance if your plans are uncertain, as these are the only ways to guarantee your money back outside of the initial 24-hour grace period.