UA4857 ManchesterMHT · 09:25 WashingtonIAD · 11:17
UA4857 by United Airlines flies from Manchester (MHT) to Washington (IAD) for the Fri, Sep 18 departure.
arrived at IAD · 10 min early
⚖ UA4857 typically leaves +8 and lands −25. The air wins minutes back.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 −25 min · 0 cancelled · 15 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at MHT and IAD are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. For this route and airline, under conditions like today's, over the last 90 days.
Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other Manchester to Washington flights today
same route · United AirlinesIf UA4857 is cancelled, these are the other United Airlines nonstop flights from Manchester to Washington on the same day, with scheduled departure times in MHT local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How UA4857 actually runs
Pro Flight Search has tracked every published board update for UA4857 across the MHT and IAD boards: schedule changes, gate pushes and actual clocks. Usually lands ~23 min early. Based on 14 confirmed landings · 14/14 within 15 min of schedule. Pushes back late but makes up time in the air.
The verdict above is that record speaking, so it reflects how UA4857 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: N14153, N13161, N21197, N17169.
Board clocks recorded as MHT and IAD published them.
Planning around UA4857? 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 — UA4857 Manchester to Washington on-time performance, measured from the MHT and IAD airport boards.
https://proflightsearch.com/flight/UA4857
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