Of 7,255 sampled OO departures, 55.3% left 15 minutes or more behind schedule. Average lateness was 26.4 minutes. Sample window: Nov 4, 2025 to Oct 29, 2026.
These are historical aggregates, not live status. A departure is late at 15 minutes past schedule.
| Month | Departures sampled | Late | Average lateness |
|---|---|---|---|
| Nov 2025 | 116 | 56.9% | 28.9 min |
| Dec 2025 | 143 | 66.4% | 39.8 min |
| Jan 2026 | 1,385 | 51.1% | 24.6 min |
| Mar 2026 | 4,050 | 55.9% | 27.0 min |
| May 2026 | 1,145 | 53.1% | 23.5 min |
| Jun 2026 | 23 | 69.6% | 21.1 min |
| Jul 2026 | 106 | 56.6% | 24.6 min |
| Aug 2026 | 82 | 64.6% | 27.6 min |
| Sep 2026 | 84 | 71.4% | 40.6 min |
| Oct 2026 | 106 | 73.6% | 28.6 min |
| Departure airport | Departures sampled | Late | Average lateness |
|---|---|---|---|
| Phoenix Sky Harbor International Airport (PHX) | 1,423 | 54.0% | 23.0 min |
| Dallas Fort Worth International Airport (DFW) | 1,151 | 67.6% | 26.6 min |
| Los Angeles International Airport (LAX) | 975 | 39.1% | 19.1 min |
| Chicago O'Hare International Airport (ORD) | 764 | 81.0% | 48.3 min |
| Denver International Airport (DEN) | 571 | 58.5% | 26.2 min |
| George Bush Intercontinental Airport (IAH) | 210 | 62.9% | 30.6 min |
| San Francisco International Airport (SFO) | 153 | 15.0% | 6.8 min |
| Washington Dulles International Airport (IAD) | 113 | 70.8% | 31.7 min |
| Charlotte Douglas International Airport (CLT) | 104 | 88.5% | 38.3 min |
| OKC Will Rogers World Airport (OKC) | 94 | 37.2% | 18.6 min |
GET /flight_delays filtered by airline_iata=OO returns the flights delayed at this moment: flight number, scheduled and actual times and minutes of delay.
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