UA3503 WashingtonIAD · 15:09 BostonBOS · 16:59
UA3503 by United Airlines flies from Washington (IAD) to Boston (BOS) for the Wed, Oct 14 departure.
arrival expected at BOS · on schedule
board checked 31m ago · checking again in 45s
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at IAD and BOS 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 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 1 completed leg so far: landed +68 min. 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: N732YX.
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
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Pro Flight Search — UA3503 Washington to Boston on-time performance, measured from the IAD and BOS airport boards.
https://proflightsearch.com/flight/UA3503
.