Most airlines recommend arriving at the airport three hours before departure for international flights. It's common for international flights to start boarding earlier than domestic flights (the aircraft are often larger and have higher passenger capacities), which accounts for the earlier recommendation.

While the "3-hour rule" is the gold standard for international travel in 2026, it is more about risk management than a strict legal requirement. This buffer accounts for the unpredictable variables of modern travel: heavy traffic to the airport, long lines at check-in counters for document verification, and increasingly thorough security screenings. If you are flying from a major hub like JFK, Heathrow, or Dubai during peak periods, 3 hours is often barely enough. However, if you have checked in online, are traveling with only carry-on luggage, and have expedited security clearance (like TSA PreCheck or Global Entry), you can often arrive closer to 2 hours before departure. Always check your specific airline's "bag drop" cutoff time, which is usually 60 minutes before takeoff. If you miss that window, you won't be able to board regardless of how fast you can run to the gate.