Ethiopian AirlinesET67% on time
Flights ET501 10:55 daily
live
Direct flights from Washington (IAD) to Addis Ababa (ADD): 7 nonstop departures observed each week across 1 airline. 67% of the last 6 operated flights arrived within 15 minutes of schedule. The median arrival is 6 minutes late. No cancellations were recorded across the 6 tracked flights. The nonstop covers 11,563 km, an estimated 15 hours 19 minutes in the air. Measured by Pro Flight Search from live flight boards at Washington and Addis Ababa. Updated 11 September 2026 at 03:33 UTC.
IAD
Washington
busy · +27
ADD
Addis Ababa
tracking
11,563 km · ~15h 19m est.
Runs mixed · 1 airline · 7x weekly · nonstop
67% on time
of the last 6 operated IAD → ADD flights arrived within 15 minutes
Median arrival delay is +6 min. 0 of 6 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival+6 minacross the last 6 operated legs
Flight time~15h 19mestimated from route distance
Weekly departures7x1 direct airline on the leg
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Ethiopian Airlines
Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.
Who flies it
observed on the boards · 7 daysHistory
operated legs · board outcomesActual board outcomes rather than schedules, paired departure and arrival per flight and day.
Full board history, day by day →
Airports right now
live boardsWeather lens
Current conditions put the pressure at IAD: 28% odds of a 15+ minute delay and around +2 min expected when it bites, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →
next sweep in 120s
How the Washington to Addis Ababa route actually runs
Pro Flight Search records official board updates for nonstop IAD to ADD flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.
Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Cite this data
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Suggested citation
Pro Flight Search — Washington (IAD) to Addis Ababa (ADD) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/IAD-ADD
IAD to ADD questions
Is IAD–ADD running on time right now?
Some delays possible. The departure side at IAD is the weaker end, route health score 64/100. The airports section above carries the live status and delay window at both ends.
How long is the flight from IAD to ADD?
Great-circle distance is 11,563 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 846–1021 min gate-to-gate on this route.
How often does IAD–ADD fly?
Ethiopian Airlines runs the route with about 7 flights a week (daily). Since one carrier owns the route, a single disruption tends to ripple through the day.
What does the route health score measure?
A blend of departure-side delay at IAD and arrival-side delay at ADD, computed from rolling delay windows (refreshed every 40 minutes) with a daily-rollup fallback. Current MVFR, IFR, or LIFR endpoint weather caps the score when flight rules can limit throughput. Higher is healthier: 100 means operations are clean at both ends.
.