UA4251United Airlines · GSO → IAD
live · 2h ago
Route confirmed United Airlines

UA4251 GreensboroGSO WashingtonIAD · 07:17

UA4251 by United Airlines flies from Greensboro (GSO) to Washington (IAD).

Right nowNext departure today Operates daily
17:15

scheduled from GSO

Typical arrival−18 minmedian over 12 operations
Cancellation0 in 12tracked operations · cancellation odds calculator →

Where the minutes go

last 7 operations · gate push → arrival
0+30+60+90 min
10-16
+12 arrival
10-15
−24 arrival
10-14
−16 arrival
10-13
−14 arrival
10-12
−10 arrival
10-11
−30 arrival
10-09
−22 arrival

The 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 operation

median arrival −18 min · 0 cancelled · 12 operations tracked

The route today

live boards
GSOGreensboroOn-time likelyGSO delay board →
IADWashingtonModerate riskIAD delay board →
GSO→IADevery carrier, schedules and on-time historyRoute intelligence →

When it flies

scheduled departures
061422
M
T
W
T
F
S
S

Each mark is a scheduled departure at its origin-local time. Today is highlighted.

How UA4251 actually runs

Pro Flight Search has tracked every published board update for UA4251 across the GSO and IAD boards: schedule changes, gate pushes and actual clocks. Usually lands on time. Based on 12 confirmed landings · 11/12 within 15 min of schedule.

The verdict above is that record speaking, so it reflects how UA4251 operates rather than what the timetable promises. Numbers refresh as new flights operate.

Technical record

How this operation is measured

board clocksaircraft

Board log

scheduled → actual, per operation
10-16GSO IAD 07:17 07:29 (+12)
10-15GSO IAD 07:17 06:53 (−24)
10-14GSO IAD 07:17 07:01 (−16)
10-13GSO IAD 07:17 07:03 (−14)
10-12GSO IAD 07:17 07:07 (−10)
10-11GSO IAD 07:17 06:47 (−30)
10-09GSO IAD 07:17 06:55 (−22)
10-08GSO IAD 07:17 06:55 (−22)
10-07GSO IAD 07:17 06:54 (−23)
10-06GSO IAD 07:17 06:58 (−19)
10-05GSO IAD 07:17 07:09 (−8)
10-04GSO IAD 07:17 06:59 (−18)

Aircraft

Recent tails: N21154, N10156, N11165, N16183.

Board clocks recorded as GSO and IAD published them.

Planning around UA4251? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure

Cite this data

Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.

Suggested citation

Pro Flight Search — UA4251 Greensboro to Washington on-time performance, measured from the GSO and IAD airport boards.

Canonical URL
https://proflightsearch.com/flight/UA4251
How we measure this →