Your legal rights depend significantly on the jurisdiction and the reason for the cancellation. In the European Union (EU261) and United Kingdom, you are entitled to a choice between a full refund or re-routing to your destination. If the cancellation occurs less than 14 days before departure and isn't due to "extraordinary circumstances" (like weather), you may also claim fixed compensation ranging from €250 to €600 ($270–$650) based on flight distance. In the United States, Department of Transportation rules updated in 2024/2025 mandate that airlines provide automatic cash refunds if a flight is cancelled and the passenger chooses not to travel on an alternative. However, US airlines are not legally required to provide additional cash compensation for the inconvenience itself, though they must provide "duty of care" (meals/hotels) if the cancellation is within their control. Regardless of location, always keep your boarding passes and receipts for any out-of-pocket expenses incurred during the delay.