UA2021 WashingtonIAD · 09:00 San JuanSJU · 12:17
UA2021 by United Airlines flies from Washington (IAD) to San Juan (SJU).
scheduled from IAD
⚖ UA2021 typically leaves +15 and lands −7. 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 −7 min · 0 cancelled · 12 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at IAD and SJU 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.
How UA2021 actually runs
Pro Flight Search has tracked every published board update for UA2021 across the IAD and SJU boards: schedule changes, gate pushes and actual clocks. Usually lands ~7 min early. Based on 12 confirmed landings · 11/12 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 UA2021 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: N37473, N27474, N47343, N47457.
Board clocks recorded as IAD and SJU published them.
Planning around UA2021? 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 — UA2021 Washington to San Juan on-time performance, measured from the IAD and SJU airport boards.
https://proflightsearch.com/flight/UA2021
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