King Fahd Airport is the largest airport in the world. Located in Dammam, Saudi Arabia, the King Fahd International Airport is nearly 300 square miles and is the largest airport in the world. The airport was once a U.S. airbase during the Gulf War, but commercial flights began operating in 1999.

The biggest airport in the world by land area is the King Fahd International Airport (DMM), located in Dammam, Saudi Arabia. Spanning a staggering 299.6 square miles (776 square kilometers), the airport's total footprint is actually larger than the neighboring country of Bahrain or the entire city of Amsterdam. Interestingly, despite its massive size, only a small portion of the land is actually utilized for aviation infrastructure, with the rest serving as a massive buffer zone and environmental reserve. In terms of passenger traffic, the "biggest" or busiest title usually goes to Hartsfield-Jackson Atlanta International Airport (ATL) in the United States, which handles over 100 million passengers annually. However, if "biggest" refers to the largest terminal building under one roof, that title belongs to Beijing Daxing International Airport (PKX) in China, which features a single-terminal "starfish" design covering 7.5 million square feet. For 2026 travelers, King Fahd remains the undisputed king of sheer land scale, though much of its territory remains undeveloped for future expansion.