Of 431 sampled S4 departures, 83.8% left 15 minutes or more behind schedule. Average lateness was 43.6 minutes. Sample window: Nov 5, 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 |
|---|---|---|---|
| Mar 2026 | 25 | 80.0% | 32.3 min |
| May 2026 | 40 | 90.0% | 38.0 min |
| Jul 2026 | 33 | 87.9% | 66.4 min |
| Aug 2026 | 32 | 90.6% | 61.0 min |
| Sep 2026 | 56 | 80.4% | 40.6 min |
| Oct 2026 | 198 | 81.3% | 38.8 min |
| Departure airport | Departures sampled | Late | Average lateness |
|---|---|---|---|
| Lisbon Humberto Delgado Airport (LIS) | 231 | 79.7% | 34.3 min |
| John F. Kennedy International Airport (JFK) | 102 | 87.3% | 60.2 min |
| Charles de Gaulle International Airport (CDG) | 51 | 92.2% | 55.5 min |
| Boston Logan International Airport (BOS) | 30 | 86.7% | 35.1 min |
GET /flight_delays filtered by airline_iata=S4 returns the flights delayed at this moment: flight number, scheduled and actual times and minutes of delay.
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