Washington Dulles International (IAD) departure delays

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

Of 61,525 sampled departures, 65.9% left 15 minutes or more behind schedule. Average lateness was 35.0 minutes. Sample window: Nov 4, 2025 to Oct 14, 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, 31.9% late.
Best day of week: Wednesday, 61.6% late.

Airlines with the most late departures

Airline	Flights sampled	Late	Average lateness
Ethiopian Airlines (ET)	112	92.9%	49.3 min
Aeromexico (AM)	214	92.5%	28.9 min
British Airways (BA)	515	87.0%	39.1 min
Royal Air Maroc (AT)	137	85.4%	40.6 min
WestJet (WS)	24	83.3%	40.3 min

Routes from IAD

IAD to DTW — 203 flights per week
IAD to CLT — 185 flights per week
IAD to BTV — 173 flights per week
IAD to DEN — 172 flights per week
IAD to SYR — 168 flights per week
IAD to ROC — 168 flights per week
IAD to ATL — 167 flights per week
IAD to CVG — 151 flights per week

The departures that are late right now

65.9% 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.

Start free trial Delay API docs