UA1128 WashingtonIAD · 17:50 SeattleSEA · 20:56
UA1128 by United Airlines flies from Washington (IAD) to Seattle (SEA) for the Fri, Oct 30 departure.
arrival expected at SEA · on schedule
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 operation0 cancelled · 5 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at IAD and SEA 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 →
Tomorrow on this route
ForecastWashington to Seattle with United Airlines · Sun 1 Nov, local date
- Chance a departure is cancelled
- 0.2%1.7× usual
- Chance a departure leaves 60+ min late
- 4.8%0.8× usual
Forecast: WeatherTomorrow · incl. data from ECMWF (CC BY 4.0, modified) · About 2 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 Washington to Seattle flights today
same route · United AirlinesIf UA1128 is cancelled, this is the other United Airlines nonstop flight from Washington to Seattle on the same day, with scheduled departure times in IAD 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 UA1128 actually runs
Pro Flight Search has tracked every published board update for UA1128 across the IAD and SEA boards: schedule changes, gate pushes and actual clocks. Usually departs ~14 min late. Based on 5 confirmed departures · 3/5 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how UA1128 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: N27283, N17339, N17461, N17565.
Board clocks recorded as IAD and SEA published them.
Planning around UA1128? 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: UA1128 Washington to Seattle on-time performance, measured from the IAD and SEA airport boards.
https://proflightsearch.com/flight/UA1128
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