UA3409 BostonBOS · 17:49 WashingtonIAD · 19:53
UA3409 by United Airlines flies from Boston (BOS) to Washington (IAD).
scheduled from BOS
Where the minutes go
last 3 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
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at BOS 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 →
Tomorrow on this route
ForecastBoston to Washington with United Airlines · Wed 28 Oct, local date
- Chance a departure is cancelled
- 0.7%0.3× usual
- Chance a departure leaves 60+ min late
- 4.1%0.4× usual
Forecast weather: 29% chance of fog at Washington
Forecast: WeatherTomorrow · incl. data from ECMWF (CC BY 4.0, modified) · About 5 departures a day on this route with this airline. · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other Boston to Washington flights today
same route · United AirlinesIf UA3409 is cancelled, these are the other United Airlines nonstop flights from Boston to Washington on the same day, with scheduled departure times in BOS local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How UA3409 actually runs
Pro Flight Search has tracked every published board update for UA3409 across the BOS and IAD boards: schedule changes, gate pushes and actual clocks. Early read — pattern not clear yet. Only 2 completed legs so far: left right on schedule but landed about 8 min early. Not enough to call it.
The verdict above is that record speaking, so it reflects how UA3409 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: N723YX, N770YX.
Board clocks recorded as BOS and IAD published them.
Planning around UA3409? 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 — UA3409 Boston to Washington on-time performance, measured from the BOS and IAD airport boards.
https://proflightsearch.com/flight/UA3409
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