Yes, you can change your flight date after booking, but the cost and feasibility depend on your fare class and the airline's policy. In 2026, most major U.S. carriers (like Delta, United, and American) have permanently eliminated change fees for standard Economy and Premium tickets, meaning you only have to pay the fare difference if the new flight is more expensive. However, "Basic Economy" tickets are typically non-changeable and non-refundable, meaning you would have to forfeit the ticket and buy a new one if your plans change. For international travel, new 2026 regulations in some regions (like the DGCA rules in India) have introduced a "48-hour look-in" period, allowing passengers to amend or cancel tickets for free within 48 hours of booking, provided the flight is at least 7 to 15 days away. If you need to change your flight, it is always best to do so through the airline's website or app as early as possible, as fare differences tend to increase as the departure date approaches.