For international travel, a good rule is to arrive at the airport 3 hours prior to your flight. Take into account the time it takes to get through the check-in line, to pass security, and then to walk or ride (tram, bus) from the check-in area to your boarding area (your terminal and gate—listed on your boarding pass).

The "3-hour rule" remains the recommended gold standard for international flights, especially at major hubs like JFK, Heathrow, or Dubai. While many airlines have a "check-in cutoff" of 60 minutes before departure, arriving 3 hours early accounts for unpredictable variables like long security lines, document verification (passports/visas), and the physical distance between terminals. For domestic flights, 2 hours is generally sufficient, or even 90 minutes if you are using TSA PreCheck and have no bags to check. However, in 2026, with increased passenger volumes and higher security protocols, the 3-hour window is safer for those checking luggage or traveling during peak holiday periods. If you have already checked in online and have a digital boarding pass, you can often cut this time down, but remember that most airlines begin the boarding process 30 to 45 minutes before the actual departure time, and the "gate close" time is strictly enforced.