UA3503 WashingtonIAD · 15:09 BostonBOS · 16:59
UA3503 by United Airlines flies from Washington (IAD) to Boston (BOS) for the Thu, Oct 15 departure.
en route from IAD to BOS
board checked 12m ago · checking again in 45s
Board estimate · gate and arrival times. Off blocks 15:18 · typical taxi-out at IAD ≈ 8.7 min.
Where the minutes go
last 4 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The route today
live boardsWeather lens
Weather-conditioned outlook for this flight right now
Measured, 90-day sampleDriven mainly by IAD (Washington), currently flying IFR (instrument). 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 Washington to Boston flights today
same route · United AirlinesIf UA3503 is cancelled, these are the other United Airlines nonstop flights from Washington to Boston 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 UA3503 actually runs
Pro Flight Search has tracked every published board update for UA3503 across the IAD and BOS boards: schedule changes, gate pushes and actual clocks. Early read — pattern not clear yet. Only 3 completed legs so far: left a little late (~9 min) but landed about 23 min early. Not enough to call it.
The verdict above is that record speaking, so it reflects how UA3503 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: N770YX, N757YX.
Board clocks recorded as IAD and BOS published them.
Planning around UA3503? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — UA3503 Washington to Boston on-time performance, measured from the IAD and BOS airport boards.
https://proflightsearch.com/flight/UA3503
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