An International airport is an airport where flights from other countries land and/or take off. Such airports are usually larger, and often feature longer runways and facilities to accommodate the large aircraft commonly used for international or intercontinental travel. International airports normally host domestic flights (flights which take place inside only one country) in addition to international flights.

In some cases, travelers and the aircraft can clear customs and immigration at the departure airport. As one example of this, the US has customs and immigration officials at certain Canadian airports. This allows flights from those airports to fly into US airports that do not have customs and immigration facilities.