UA4939 IthacaITH WashingtonIAD · 07:31
UA4939 by United Airlines flies from Ithaca (ITH) to Washington (IAD) for the Thu, Oct 29 departure.
arrived at IAD · 32 min early
Where the minutes go
last 7 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The last 30 days
arrival outcome per operationmedian arrival −5 min · 0 cancelled · 14 operations tracked
The route today
live boardsTomorrow at Washington
ForecastFri 30 Oct, local date
- Chance a departure is cancelled
- 1.4%usually 2.0%
- Chance a departure leaves 60+ min late
- 8.5%usually 10%
Forecast: WeatherTomorrow · incl. data from ECMWF (CC BY 4.0, modified) · Based on about 360 departures a day. · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.
How UA4939 actually runs
Pro Flight Search has tracked every published board update for UA4939 across the ITH and IAD boards: schedule changes, gate pushes and actual clocks. Usually lands on time. Based on 14 confirmed landings · 11/14 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how UA4939 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationAircraft
Recent tails: N14174, N14188, N12167, N12160.
Board clocks recorded as ITH and IAD published them.
Planning around UA4939? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Pro Flight Search: UA4939 Ithaca to Washington on-time performance, measured from the ITH and IAD airport boards.
https://proflightsearch.com/flight/UA4939
.