UA4578 WashingtonIAD · 12:55 HarrisburgMDT
UA4578 by United Airlines flies from Washington (IAD) to Harrisburg (MDT).
scheduled from IAD
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 operation0 cancelled · 12 operations tracked
The route today
live boardsWhen it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other Washington to Harrisburg flights today
same route · United AirlinesIf UA4578 is cancelled, these are the other United Airlines nonstop flights from Washington to Harrisburg on the same day, with scheduled departure times in IAD local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How UA4578 actually runs
Pro Flight Search has tracked every published board update for UA4578 across the IAD and MDT boards: schedule changes, gate pushes and actual clocks. Usually departs ~16 min late. Based on 12 confirmed departures · 6/12 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how UA4578 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: N578GJ, N566GJ, N520GJ, N546GJ.
Board clocks recorded as IAD and MDT published them.
Planning around UA4578? 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 — UA4578 Washington to Harrisburg on-time performance, measured from the IAD and MDT airport boards.
https://proflightsearch.com/flight/UA4578
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