As of March 2026, many aviation authorities, including the DGCA in India, have implemented a "40-hour or 48-hour look-in option" that allows passengers to change or cancel a flight for free within 48 hours of booking, provided the flight is at least 7 days away (domestic) or 15 days (international). Outside of this window, whether a change is free depends on your fare class. "Basic Economy" tickets typically do not allow free changes, while standard Economy and Business Class tickets often allow for one-time changes without a "change fee," though you must still pay the difference in fare if the new flight is more expensive. If the airline initiates the change (e.g., a flight delay or cancellation), you are almost always entitled to a free rebooking or a full refund regardless of your ticket type.