**Updated June 2025 to reflect summer 2025 schedule**

Which are the busiest airports in the US? We’ve taken a look at airline capacity data for the summer season of 2025 to see which US airports have the most departing seats.

The Busiest Airports in the USA

In summer 2025, Atlanta Hartsfield-Jackson (ATL) remains the busiest airport in the US with 38.0 million seats, 2% more than in summer 2024. It sits around seven million seats ahead of the airport in second place, Chicago O'Hare (31.3 million). Capacity at Chicago O'Hare Airport (ORD) has grown by 9% in Summer 2025 compared to last year. Its two largest carriers, United and American are driving growth with increases of 9% and 20% in their domestic seat capacity respectively.

The third busiest airport for scheduled airline capacity is Dallas Fort Worth (DFW) with 30.7 million seats.

The top ten US airports account for 35% of capacity operating at the 672 US airports with scheduled services.

The rest of the top ten busiest airports in the US play out as follows:

• 4th Denver International Airport (DEN): 29,727,333 seats
• 5th Los Angeles International Airport (LAX): 27,065,245 seats
• 6th New York John F. Kennedy International Airport (JFK): 23,559,605 seats
• 7th Las Vegas Harry Reid International Airport (LAS): 20,276,586 seats
• 8th Douglas International Airport (CLT): 20,063,771 seats
• 9th San Francisco International Airport (SFO): 19,623,701 seats
• 10th Seattle-Tacoma International Airport (SEA): 19,618,526 seats 

In our May 2025 round-up of the world’s busiest airports, Atlanta airport takes first place with 5.52 million seats for the month. Dubai International (DXB) comes in second with 5.2 million. DFW and ORD are fifth and sixth busiest in the world, respectively. In contrast, no US airport makes it into the top ten busiest international airports list, highlighting the importance of the domestic market for US airports.

Each month we highlight the busiest airports, airlines, flight routes and states in the US in terms of airline capacity. We’ll let you know when new data is added to our US Aviation Market Dashboard if you subscribe (below) to our weekly digest of aviation insights, analysis, and global capacity updates.

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