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.

In 2026, the "gold standard" recommendation for an international flight is to arrive at least 3 hours before departure. While you may think 2 hours is sufficient, modern airport hubs (like Heathrow or JFK) now feature advanced biometric checks and high-tech CT security scanners that can occasionally have long queues. Furthermore, most "Bag Drop" and check-in counters for long-haul flights strictly close 60 minutes before take-off. Arriving 3 hours early ensures you have time for "document verification" (checking visas or passports), navigating massive terminals, and reaching your gate, which can sometimes be a 20-minute walk or a train ride away. If you have TSA PreCheck or Global Entry, you might safely arrive at the 2-hour mark, but for general travelers, the 3-hour rule remains the only way to avoid the stress of a "gate closing" announcement while you are still stuck in a security line.