Chicago O'Hare International Airport (ORD) August 2025 Operational Report

Flight Activity Overview

Total Departing Flights: 40,756

Year-over-Year Change in Departing Flights: +18.69%

In August 2025, Chicago O'Hare International Airport handled 40,756 departures, a +18.69% year‑over‑year change as carriers expanded summer capacity and up‑gauged peak hub banks. The growth underscores the hub’s Midwest gateway role, strengthening connectivity across North America and select long‑haul markets.

On-Time Performance and Cancellations

Departure On-Time Performance: 55.20%

Year-over-Year Change in On-Time Performance: -2.14 percentage points

Cancelled Flights: 184

Year-over-Year Change in Cancellations: -68.65%

Departure on‑time performance averaged 55.20%, influenced by Great Lakes convective weather and air‑traffic flow management during afternoon hub banks. Cancellations fell to 184 ( -68.65% YoY ), while on‑time performance was -2.14 percentage points lower than a year ago, concentrating delays in storm‑affected periods.

Airlines Serving Chicago O'Hare International Airport

United Airlines and American Airlines anchor large hub operations at Chicago O'Hare International Airport, supported by an extensive regional feed and ultra‑high‑frequency domestic links. International service connects key European and Asian gateways, complementing dense transcontinental coverage.

Outlook

Over the next 4–8 weeks, schedules at the hub should remain broadly stable with departure on‑time performance near current levels; afternoon thunderstorms and Friday–Sunday peaks may still trigger pockets of delay. Passengers should prioritize morning departures, allow 60–90 minutes of buffer for security and connections on busy days, and monitor real‑time gate and weather alerts via the NextFly App.