Denver International Airport (DEN), commonly known as DIA, is the largest airport in the United States by total land area and one of the busiest in the world for passenger traffic. Located about 25 miles northeast of downtown Denver, it serves as a major hub for United Airlines, Southwest Airlines, and Frontier Airlines, connecting travelers to destinations across North America, Europe, and Asia.

DEN is recognized for its striking white-canopy terminal roof, inspired by the nearby Rocky Mountains, and its efficient, modern layout. The airport features a single, central terminal — the Jeppesen Terminal — and three concourses (A, B, and C) connected by an underground train system. With ongoing expansion projects, including the Great Hall renovation, Denver continues to improve efficiency, comfort, and passenger flow for millions of travelers every year.

Denver International Airport operates multiple TSA security checkpoints across its Jeppesen Terminal.

The main screening areas are:

• North Security Checkpoint: Open 24/7 and includes TSA PreCheck lanes.
• South Security Checkpoint: Typically open from 4:00 a.m. – 9:00 p.m. and offers CLEAR service.
• Bridge Security Checkpoint: Located on Level 6 for travelers walking to Concourse A.

Peak security hours at DEN are generally between 5:00 a.m. and 8:30 a.m., and again from 2:30 p.m. to 6:00 p.m. The airport recommends arriving two hours before domestic flights and three hours before international departures, especially during ski season and holidays when traffic is highest.

TSA PreCheck, CLEAR, and automated screening lanes help reduce wait times during rush periods. Real-time TSA wait time updates are available through airport monitors and traveler-submitted reports on Airport Security Status.

Which concourse handles international flights?

What’s the best way to get between terminals at DEN?

How do I get to downtown Denver from the airport?