Washington Dulles International Airport (IAD) departure delays

Name: Washington Dulles International Airport (IAD) departure delays
Creator: FlightLabs

Of 66,120 sampled departures, 65.6% left 15 minutes or more behind schedule. Average lateness was 34.8 minutes. Sample window: Nov 4, 2025 to Oct 28, 2026.

These are historical aggregates, not live status. A departure is late at 15 minutes past schedule.

When departures are on time

Best hour to depart: 23:00–23:59, 32.4% late.
Best day of week: Wednesday, 61.0% late.

Airlines with the most late departures

Airline	Flights sampled	Late	Average lateness
Ethiopian Airlines (ET)	119	93.3%	49.5 min
Aeromexico (AM)	229	92.6%	29.2 min
British Airways (BA)	553	87.7%	39.4 min
Royal Air Maroc (AT)	144	84.7%	40.0 min
African International Airways (WS)	24	83.3%	40.3 min

Routes from IAD

IAD to SYR — 95 flights per week
IAD to BTV — 88 flights per week
IAD to ROC — 86 flights per week
IAD to ATL — 86 flights per week
IAD to LGA — 83 flights per week
IAD to DTW — 76 flights per week
IAD to PHL — 71 flights per week
IAD to CVG — 66 flights per week

The departures that are late right now

65.6% of this IAD 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=IAD

Example response

Field 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": "IAD", "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 IAD departures that are late right now, in the JSON above. After the trial, Starter is $24.99/mo.

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