For an international flight, it is generally recommended to arrive at the airport at least 3 hours before your scheduled departure. This allows sufficient time for check-in, security, passport control, and boarding procedures, which tend to be longer for international travel compared to domestic flights. Additional factors to consider include the size of the airport (larger airports may require more time), baggage check requirements, and the specific airline's check-in cutoff times. Some airports and airlines might require even earlier arrival, up to 4 hours before departure in certain cases. Boarding for international flights often begins 45 minutes to an hour before departure, which is also factored into this recommendation.

In summary:

• Aim to be at the airport 3 hours before departure for international flights.
• Check specific airline and airport recommendations.
• Arriving earlier may be sensible in large airports or busy travel periods.