A 50-minute layover at Athens International Airport (ATH) is tight but achievable, particularly for "intra-Schengen" flights (e.g., flying from Rome to Athens and connecting to Santorini). Since Athens is a relatively compact, well-organized "single-terminal" airport, you can often walk from one gate to another in about 15 to 20 minutes. However, if your journey involves an "Extra-Schengen" connection (e.g., arriving from London or New York and connecting to a Greek island), you must pass through passport control, which can easily take 30 to 45 minutes during peak summer hours. In 2026, if you are booked on a single ticket with Aegean or Olympic Air, the airline is responsible for rebooking you if you miss the connection, and they often have staff at the gate to fast-track passengers with short windows. If you are traveling with checked bags, the 50-minute window is the "danger zone" where your bags might not make the transfer even if you do. For peace of mind, especially during the busy March-to-October season, a 90-minute layover is much safer for navigating the "Gateway to the Mediterranean."