US flight delay data studies
These three studies rank US airports using Bureau of Transportation Statistics on-time reporting. Each page leads with the finding, a dated figure, the definition, a sortable table and a CSV of that table.
Source: DelayGuard analysis of US DOT/BTS data, January 2023 to December 2025.
Air traffic control delays by US airport
Among the 39 airports with a DelayGuard airport page (22 delay guides and 17 statistics pages), Fort Lauderdale (FLL) had the highest share of departures with a BTS National Aviation System (NAS) delay: 16.09% of 264,272 completed departures from January 2023 to December 2025.
How the 2025 government shutdown affected flights
LaGuardia (LGA) had the largest increase in the departure cancellation rate from 1 October 2025 to 12 November 2025: 3.98% cancelled (663 of 16,661), 3.47 points above the same dates in 2024 (0.51%).
Winter flight cancellations by US airport
Reagan National (DCA) had the highest winter cancellation rate among these 39 airports: 3.92% (5,342 of 136,433) in winters 2022-23, 2023-24, 2024-25 and 2025-26. Salt Lake (SLC) had the lowest, 1.08%.
Cite this
DelayGuard data studies, https://www.delayguard.ai/research, based on US DOT BTS On-Time Reporting. Generated 2026-10-20.