When you rebook a flight in 2026, the outcome depends heavily on your fare class and the reason for the change. If you are changing it voluntarily, most major airlines have eliminated "change fees" for standard economy and above, but you must still pay the Fare Difference. If the new flight is $200 more expensive, you pay that amount; if it is cheaper, you often receive the difference as an eCredit. However, if the airline cancels your flight or causes a major delay (typically 3+ hours), you are entitled to be rebooked on the next available flight for free, or you can request a full refund to your original payment method. In the U.S. and EU, specific passenger rights laws (like EC 261/2004) may also require the airline to provide food vouchers or hotel stays during the wait. If you have "Basic Economy," rebooking is often prohibited entirely, meaning you may lose the value of the ticket if you can't make the original flight, making it essential to read the "Fare Rules" before purchase.