Denver International Airport (IATA: DEN, ICAO: KDEN) is the primary international airport serving Denver, Colorado, and the surrounding Rocky Mountain region. Located approximately 25 miles northeast of downtown Denver, DEN is the largest airport in the United States by total land area, covering more than 33,000 acres.
DEN opened on February 28, 1995, replacing Stapleton International Airport. The airport is instantly recognizable by its iconic white tent-like roof, designed to resemble the snow-capped Rocky Mountains. DEN is a major hub for United Airlines, which operates more flights from Denver than any other carrier, and a focus city for Southwest Airlines and Frontier Airlines.
In 2025, Denver International Airport served a record 82,427,962 passengers, a slight increase over 2024 and the busiest year in the airport’s history. International passenger traffic reached an all-time record of 4,867,484, a 4.8% increase over 2024. DEN ranked as the fourth busiest airport in the United States and the tenth busiest in the world for the first 11 months of 2025. United Airlines set an all-time passenger record at DEN with more than 41.4 million passengers. The airport offers nonstop service to 201 domestic destinations and 35 international destinations across 19 countries.
DEN is the number one airport in the United States for domestic connectivity. The airport operates one main terminal — the Jeppesen Terminal — with three airside concourses (A, B, and C) connected by an underground Automated Transit System (ATS) train.