UA721 BostonBOS · 14:40 WashingtonIAD · 16:27
UA721 by United Airlines flies from Boston (BOS) to Washington (IAD) for the Fri, Oct 30 departure.
arrived at IAD · 13 min early
Where the minutes go
last 5 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 −13 min · 0 cancelled · 5 operations tracked
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. These figures come from both airports' records 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 Boston to Washington flights today
same route · United AirlinesIf UA721 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 that show a delay still operate. Rebooking usually helps only when that delay is very large. Every airline on this route →
How UA721 actually runs
Pro Flight Search has tracked every published board update for UA721 across the BOS and IAD boards: schedule changes, gate pushes and actual clocks. Usually lands on time. Based on 5 confirmed landings · 4/5 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how UA721 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: N37413, N38417, N67827.
Board clocks recorded as BOS and IAD published them.
Planning around UA721? 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: UA721 Boston to Washington on-time performance, measured from the BOS and IAD airport boards.
https://proflightsearch.com/flight/UA721
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