Of 14,461 sampled 1I departures, 75.5% left 15 minutes or more behind schedule. Average lateness was 42.6 minutes. Sample window: Nov 4, 2025 to Oct 31, 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 | 462 | 79.0% | 47.1 min |
| Dec 2025 | 547 | 80.3% | 54.2 min |
| Jan 2026 | 2,118 | 77.0% | 40.7 min |
| Feb 2026 | 40 | 62.5% | 42.3 min |
| Mar 2026 | 6,629 | 78.5% | 42.8 min |
| Apr 2026 | 35 | 62.9% | 22.7 min |
| May 2026 | 1,590 | 78.2% | 38.7 min |
| Jun 2026 | 268 | 80.2% | 45.0 min |
| Jul 2026 | 618 | 83.8% | 51.2 min |
| Aug 2026 | 542 | 74.7% | 43.5 min |
| Sep 2026 | 798 | 51.9% | 34.3 min |
| Oct 2026 | 814 | 53.7% | 44.3 min |
| Departure airport | Departures sampled | Late | Average lateness |
|---|---|---|---|
| Washington Dulles International Airport (IAD) | 3,121 | 74.2% | 49.4 min |
| Los Angeles International Airport (LAX) | 891 | 68.4% | 40.2 min |
| Palm Beach International Airport (PBI) | 391 | 85.9% | 57.1 min |
| Harry Reid International Airport (LAS) | 387 | 81.9% | 47.6 min |
| John F. Kennedy International Airport (JFK) | 371 | 71.4% | 47.9 min |
| Dallas Love Field (DAL) | 326 | 82.2% | 48.4 min |
| LaGuardia Airport (LGA) | 314 | 68.5% | 37.7 min |
| Westchester County Airport (HPN) | 302 | 79.5% | 51.4 min |
| San Francisco International Airport (SFO) | 301 | 4.7% | 1.0 min |
| Chicago Midway International Airport (MDW) | 281 | 81.9% | 49.7 min |
GET /flight_delays filtered by airline_iata=1I returns the flights delayed at this moment: flight number, scheduled and actual times and minutes of delay.
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