Yes, you can generally change flights for a fee, though the landscape of "change fees" has shifted significantly by 2026. Major carriers now offer a "tiered" approach where Standard Economy, Business, and First Class tickets often have no change fees (though you must still pay the fare difference). However, Basic Economy tickets remain the most restrictive, frequently being non-changeable and non-refundable unless a specific "flexible" add-on was purchased at the time of booking. In regions like India, as of March 26, 2026, the DGCA has implemented a 48-hour "look-in" period, allowing passengers to modify or cancel tickets without any penalty if booked at least 7 days in advance. Beyond these specific windows, the "fare difference" is often the most significant cost of changing a flight. If you anticipate needing flexibility, it is always safer to book a "Main Cabin" fare rather than the lowest tier, as the cost of a last-minute change on a restricted ticket can sometimes exceed the price of a brand-new flight.