Missing your designated boarding window on a cruise is a serious situation that often results in the ship sailing without you. Most cruise lines require passengers to be checked in and on board at least 60 to 90 minutes before the scheduled departure time to finalize manifest details for port authorities. If you arrive after the gangway has been retracted, the cruise line is under no legal obligation to wait for you, even if your delay was caused by a flight cancellation (unless you booked your airfare through the cruise line’s protected program). In this scenario, you are responsible for all costs associated with traveling to the next port of call to intercept the ship, which may involve expensive last-minute flights, private transfers, and hotel stays. Furthermore, if the next port is in a different country, you must ensure you have the correct visas to enter that country by air rather than sea. It is important to note that most cruise tickets are non-refundable for "no-shows," so missing the boat without travel insurance can result in the total loss of your vacation investment.