Simple Flying
Antonio Di Trapani
03 August 2025
In 2025, America’s busiest airports continue to play a critical role in shaping both domestic and international air travel.
This guide goes beyond surface-level rankings to examine which US airports are leading the charge in terms of seat capacity and flight frequency, and why they matter more than ever.
Top US Airports By Seat Capacity In 2025
According to the latest data from OAG for July 2025, Hartsfield-Jackson Atlanta International Airport (ATL) holds onto its long-standing position as the busiest airport in the United States, with approximately 5.7 million scheduled seats, marking a modest but steady 1% year-over-year increase.
Chicago O'Hare International Airport (ORD) comes in second on the national list (and third globally!) with a significant 11% surge in scheduled seat capacity, reaching approximately 4.76 million seats in July 2025.
Denver International Airport (DEN) continues its climb, reporting 4.65 million seats, a 3% increase year-over-year.
Meanwhile, Dallas/Fort Worth International Airport (DFW) comes in just ahead with 4.72 million seats, though this represents a 2% decline from 2024...
