Denver International Airport, or DEN, is located in the city's northeast; locals sometimes refer to it as DIA. It’s the largest airport in the U.S. by land area at 52.4 square miles — more than twice the size of the island of Manhattan. America's third-busiest airport by passenger volume, it served more than 77.8 million passengers in 2023. Here, find what you need to know about traveling into and out of DEN.