Yes, you can almost always change your flight after paying, but the cost of that change varies wildly based on your "fare class" and when you make the request. In 2026, the global trend toward "flexible bookings" continues: most major U.S. and European carriers (like Delta, United, and British Airways) offer no change fees for "Main Cabin" or higher fares, meaning you only pay the difference in the price of the new ticket. However, if you booked a "Basic Economy" or "Light" fare, your ticket is likely non-changeable and non-refundable, essentially requiring you to buy a new ticket. A significant update in 2026 for the Indian market is the proposed DGCA rule allowing a 48-hour "look-in" window after booking, where you can amend or cancel your ticket for free (except for fare differences). For most airlines, you can make changes via their mobile app up to 2 hours before departure. If your new flight is cheaper, some airlines will even issue you an "eCredit" or travel voucher for the difference, though "Basic" tickets are usually exempt from this perk.