In 2025, U.S. airlines operated 7.2 million flights. Of these, 1.8 million experienced delays—a 25% delay rate that cost the industry an estimated $32 billion in direct costs. The average passenger lost 47 minutes per delayed flight.

Not all delays are created equal. Weather accounts for 35% of all delays, followed by carrier-related issues at 28%, and air traffic congestion at 22%. The remaining 15% stem from security, customs, and miscellaneous factors.

Performance varies significantly by carrier. Delta Airlines led the pack with just 18% of flights delayed, while budget carrier Spirit struggled with a 34% delay rate. Legacy carriers generally outperformed low-cost carriers in on-time performance.

Certain airports experience disproportionately high delay rates due to weather patterns, runway capacity, and traffic volume. Newark (EWR) led the nation with 38% of flights delayed, while San Francisco (SFO) struggled with frequent fog-related delays.

• Newark (EWR): 38% delay rate, primarily due to airspace congestion and weather patterns affecting the Northeast corridor.

• San Francisco (SFO): 35% delay rate, fog frequently reduces runway capacity from 4 to 2 arrivals per hour.

• LaGuardia (LGA): 33% delay rate, limited runway space and proximity to JFK airspace creates bottlenecks.

• Boston (BOS): 31% delay rate, winter weather and heavy traffic contribute to persistent delays.

• Chicago O'Hare (ORD): 29% delay rate, despite modernization, remains a congestion hotspot.