UA878United Airlines · HKG → SFO
live · 17m ago
Route confirmed United Airlines

UA878 Hong KongHKG · 22:30 San FranciscoSFO · 18:55

UA878 by United Airlines flies from Hong Kong (HKG) to San Francisco (SFO) for the Tue, Nov 3 departure.

Right nowScheduled · today
22:30

departs HKG · on schedule

Typical gate push+10 minmedian posted departure
Typical arrival+7 minmedian over 4 operations
Wins back in air~3 minmedian gate push vs arrival · how planes make up time →

Where the minutes go

last 4 operations · gate push → arrival
0+30+60+90 min
11-02
+15 gate · −1 arrival
11-01
+3 gate · −14 arrival
10-31
+5 gate · +25 arrival
10-30
+22 gate · +14 arrival

The bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.

The route today

live boards
HKGHong KongOn-time likelyHKG delay board →
SFOSan FranciscoOn-time likelySFO delay board →
HKG→SFOevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Delay & cancellation outlook for this flight

Measured, 90-day sample
42%Chance of 15+ min delay
1.2%Chance of cancellation
+11 minTypical airport delay in this weather

Conditions at HKG and SFO 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 at Hong Kong

Forecast

Wed 4 Nov, local date

High29°Clikely 28°C to 30°C
Low26°Clikely 25°C to 27°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.

Tomorrow at San Francisco

Forecast

Tue 3 Nov, local date

High19°Clikely 17°C to 20°C
Low12°Clikely 11°C to 14°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 Hong Kong to San Francisco flights today

same route · United Airlines
UA862departs 10:35

If UA878 is cancelled, this is the other United Airlines nonstop flight from Hong Kong to San Francisco on the same day, with scheduled departure times in HKG 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 UA878 actually runs

Pro Flight Search has tracked every published board update for UA878 across the HKG and SFO boards: schedule changes, gate pushes and actual clocks. Usually lands ~14 min late. Based on 3 confirmed landings · 2/3 within 15 min of schedule.

The verdict above is that record speaking, so it reflects how UA878 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
11-02HKG 22:30 22:45 (+15)SFO 18:55 18:54 (−1)
11-01HKG 22:30 22:33 (+3)SFO 18:55 18:41 (−14)
10-31HKG 22:30 22:35 (+5)SFO 19:55 20:20 (+25)
10-30HKG 22:30 22:52 (+22)SFO 19:55 20:09 (+14)

Board clocks recorded as HKG and SFO published them.

Planning around UA878? 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: UA878 Hong Kong to San Francisco on-time performance, measured from the HKG and SFO airport boards.

Canonical URL
https://proflightsearch.com/flight/UA878
How we measure this →