In 2026, the "24-hour cancellation" rule depends heavily on the country of booking and the airline's specific policy. In the United States, the Department of Transportation (DOT) requires airlines to allow you to cancel a booking within 24 hours for a full refund without penalty, provided the flight was booked at least seven days prior to departure. In India, the DGCA introduced even more traveler-friendly rules in early 2026, allowing passengers to cancel or modify tickets for free within 48 hours of booking, as long as the flight is not departing within the next few days. However, these rules typically only apply if you book directly through the airline's website or app. If you book through a third-party "Online Travel Agency" (OTA), they are not legally bound by the DOT's 24-hour rule and may charge their own administrative fees. Always confirm that you have selected a "Refundable" fare if you think you might need to cancel outside of these very specific legal windows.