Of 10,949 sampled departures, 64.0% left 15 minutes or more behind schedule. Average lateness was 31.3 minutes. Sample window: Nov 15, 2025 to Jul 28, 2026.
These are historical aggregates, not live status. A departure is late at 15 minutes past schedule.
| Airline | Flights sampled | Late | Average lateness |
|---|---|---|---|
| Air Canada (AC) | 62 | 93.6% | 54.6 min |
| Empire Airlines (EM) | 20 | 90.0% | 48.8 min |
| Korean Air (KE) | 25 | 88.0% | 47.0 min |
| Southwest Airlines Co. (WN) | 284 | 86.3% | 47.8 min |
| British Airways (BA) | 51 | 84.3% | 26.3 min |
64.0% of this SEA sample left 15 minutes late or more.
GET /flight_delays returns the ones that are late at this moment: airline, flight number, scheduled time, actual time and minutes of delay.
https://www.goflightlabs.com/flight_delays?access_key=YOUR_ACCESS_KEY&delay=15&type=departures&dep_iata=SEAField names match the live API. This flight only shows the shape. It is not a live result.
{
"success": true,
"data": [
{
"airline_iata": "AA",
"flight_iata": "AA100",
"flight_number": "100",
"dep_iata": "SEA",
"dep_time": "2024-03-15 08:00",
"dep_actual": "2024-03-15 08:22",
"dep_delayed": 22,
"status": "active"
}
]
}
That URL still says YOUR_ACCESS_KEY.
A 7-day trial replaces it with a real key and returns the SEA departures that are late right now, in the JSON above.
After the trial, Starter is $24.99/mo.