To check bags or check in at the airport, you must be there a certain amount of time before scheduled departure: Within the U.S. – 45 minutes. To or from destinations outside the U.S. – 60 minutes.

The closing time for flight check-in varies significantly by airline and whether your flight is domestic or international. As a standard rule in 2026, check-in counters for domestic flights typically close 45 to 60 minutes before the scheduled departure time. For international flights, the window is stricter, usually closing 60 to 90 minutes prior to takeoff. Low-cost carriers and certain high-security hubs may have even earlier cut-offs. Online and mobile check-in windows usually close roughly 60 to 90 minutes before departure as well. It is critical to remember that "check-in" is different from "boarding"; boarding gates often close 15 to 30 minutes before the plane leaves. To avoid stress, most airlines now recommend arriving at the airport at least 2 hours before a domestic flight and 3 hours before an international one to account for potential security and baggage drops.