UA900United Airlines · LHR → SFO
live · 5m ago
Route confirmed United Airlines

UA900 LondonLHR · 10:05 San FranciscoSFO · 13:20

UA900 by United Airlines flies from London (LHR) to San Francisco (SFO) for the Thu, Nov 5 departure.

Right nowExpected · today
10:05

departs LHR · on schedule

Typical gate push+20 minmedian posted departure
Typical arrival−40 minmedian over 5 operations
Wins back in air~60 minmedian gate push vs arrival · how planes make up time →

Where the minutes go

last 5 operations · gate push → arrival
0+31+63+94 min
11-05
−40 arrival
11-04
+16 gate · −40 arrival
11-03
+7 gate · −41 arrival
11-02
+94 gate · +43 arrival
11-01
+23 gate · +3 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 −40 min · 0 cancelled · 5 operations tracked

The route today

live boards
LHRLondonModerate riskLHR delay board →
SFOSan FranciscoOn-time likelySFO delay board →
LHR→SFOevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Weather-conditioned outlook for this flight right now

Measured, 90-day sample
40%Chance of 15+ min delay
1.7%Chance of cancellation
+10 minTypical airport delay in this weather

Driven mainly by SFO (San Francisco), currently flying VFR (visual). 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 at London

Forecast

Fri 6 Nov, local date

High11°Clikely 10°C to 12°C
Low7°Clikely 4°C to 9°C

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

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.

Other London to San Francisco flights today

same route · United Airlines
UA949departs 13:45
UA939departs 16:15

If UA900 is cancelled, these are the other United Airlines nonstop flights from London to San Francisco on the same day, with scheduled departure times in LHR 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 UA900 actually runs

Pro Flight Search has tracked every published board update for UA900 across the LHR and SFO boards: schedule changes, gate pushes and actual clocks. Usually lands ~40 min early. Based on 5 confirmed landings · 4/5 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 UA900 operates rather than what the timetable promises. Numbers refresh as new flights operate.

Technical record

How this operation is measured

board clocks

Board log

scheduled → actual, per operation
11-05LHR 10:05SFO 13:20 12:40 (−40)
11-04LHR 10:05 10:21 (+16)SFO 13:20 12:40 (−40)
11-03LHR 10:05 10:12 (+7)SFO 13:20 12:39 (−41)
11-02LHR 10:05 11:39 (+94)SFO 13:20 14:03 (+43)
11-01LHR 10:05 10:28 (+23)SFO 13:20 13:23 (+3)

Board clocks recorded as LHR and SFO published them.

Planning around UA900? 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: UA900 London to San Francisco on-time performance, measured from the LHR and SFO airport boards.

Canonical URL
https://proflightsearch.com/flight/UA900
How we measure this →