Yes, you have a legal right to a full cash refund if your flight is cancelled by the airline, regardless of the reason for the cancellation. Under DOT rules (US), EU261 (Europe), and UK261 (United Kingdom), if the airline cancels your flight and you choose not to travel on the alternative flight offered, they must refund the original form of payment within 7 to 20 business days. You are not obligated to accept vouchers or travel credits. Additionally, if the cancellation was within the airline's control and occurred within 14 days of departure, you may also be entitled to financial compensation ranging from $250 to $700 on top of your refund, depending on the distance and the delay in reaching your final destination.