A 1-hour transfer at Amsterdam Airport Schiphol (AMS) is technically possible but very risky, particularly for international connections. Schiphol is a "one-terminal" airport, which simplifies the physical navigation, but its sheer size means it can take 20 to 25 minutes to walk between distant piers (like D and M). If you are transferring between two Schengen-zone countries (e.g., Germany to Spain), 1 hour is usually sufficient as there are no passport checks. However, if you are arriving from a non-Schengen country (like the US or UK) and connecting to a Schengen destination, you must clear mandatory passport control, which can have lines lasting 30 to 45 minutes during peak morning hours. In 2026, KLM and the airport authority generally recommend a minimum of 50 minutes for non-Schengen connections, but a 1-hour window leaves zero margin for even a minor flight delay. If your gates are far apart and the airport is busy, you may find yourself sprinting to catch your next flight. To be safe, most experienced travelers prefer a minimum of 90 minutes at Schiphol to allow for potential security re-screening and passport processing.