The cost to rebook a missed flight depends on the airline's policy and why you missed it. Most major US and European carriers follow an unofficial "Flat Tire Rule," where if you arrive at the airport within two hours of your missed departure, agents may rebook you on the next available flight for free or for a small standby fee. However, if you are a "no-show" and don't contact the airline, your entire itinerary (including return flights) may be cancelled without a refund. In 2026, many airlines have eliminated formal "change fees," but you will almost always have to pay the fare difference between your original ticket and the new flight. For "Basic Economy" tickets, rebooking is often prohibited entirely, requiring the purchase of a brand-new ticket at current prices.