KLM allows passengers to check in starting 30 hours before their flight’s scheduled departure. For flights to or from the United States, the check-in window opens 24 hours in advance. Passengers can use the KLM website or mobile app to check in online, select seats, and obtain their boarding pass digitally. This digital boarding pass can be printed or saved on a smartphone, making it easier to move through the airport, especially if traveling with only carry-on luggage. Online check-in typically closes about 1 to 2 hours before departure, depending on the destination. For travelers who prefer to check in at the airport, KLM offers self-service kiosks and staffed check-in counters. These counters usually open about two hours before European flights and three hours before long-haul flights. The check-in desks close approximately 40 minutes before departure for European routes and 60 minutes before for long-distance flights. Self-service kiosks operate on a similar schedule, allowing passengers to print boarding passes and baggage tags quickly. Business class passengers and those with elite status may have access to dedicated counters, which can make the process faster but follow the same overall timing. At Amsterdam Schiphol Airport, KLM offers extensive check-in services, including some counters that operate 24 hours a day for certain flights, and early baggage drop options to help passengers manage their time efficiently. Although online check-in opens much earlier, airport counters generally will not accept check-in more than two to three hours before departure. KLM advises passengers to arrive at the airport at least two hours before short-haul flights and at least three hours before long-haul flights to allow sufficient time for baggage drop, security screening, and boarding. Passengers traveling from busy airports or during peak travel seasons should consider arriving even earlier. The airline’s flexible check-in times provide convenience and allow travelers to plan their arrival accordingly, reducing stress and waiting times. Whether passengers choose to check in online, at a kiosk, or at a counter, it is important to complete the process well before the cut-off to avoid complications. By using the early online check-in option and following recommended arrival times, passengers can enjoy a smoother airport experience with KLM.