In 2026, the ability to check bags the night before depends largely on your airline and departure airport. This service, often called "Day-before Check-in" or "Twilight Check-in," is most common at major European hubs like London Heathrow, Gatwick, and Frankfurt. For instance, British Airways, Lufthansa, and EasyJet often allow this for early morning flights (departing before 8:00 AM or 9:00 AM) to ease morning congestion. However, in the United States, this is rarely offered due to TSA security regulations and staffing constraints. Most U.S. carriers like Delta or American require that bags be checked no more than 4–6 hours before departure. Always verify with your specific airline's "Baggage Information" page for 2026, as some carriers have tightened these windows to manage high volumes and limited storage space in modernized baggage handling systems.