When an airline reschedules your flight, your rights depend on the "significance" of the change and the local regulations (like UK261/EC261 or DOT rules). In 2026, if an airline moves your flight by more than 3 hours (domestic) or 6 hours (international), it is generally considered a "significant change." In this case, you are legally entitled to a full cash refund if the new time doesn't work for you, or the airline must rebook you on an alternative flight at no extra cost. If the reschedule happens within 14 days of departure and results in you arriving significantly later than planned, you may also be eligible for financial compensation up to £520/€600. It is a peer-to-peer essential to check your email and the airline app frequently, as "schedule slippage" is common. A high-value strategy is to use a significant reschedule as leverage to "shop" for a more convenient flight time on the same day—most airlines will let you switch to any available flight within a 24-hour window for free if they were the ones who initiated the original change.