UA838United Airlines · NRT → SFO
live · 9m ago
Route confirmed United Airlines

UA838 TokyoNRT · 16:55 San FranciscoSFO · 09:30

UA838 by United Airlines flies from Tokyo (NRT) to San Francisco (SFO) for the Mon, Nov 9 departure.

Right nowEn route to San Francisco · off blocks 17:10 · 15 min late
09:00

estimated arrival at SFO · local time · ~3h 35m from now

En routeUA838 · position estimated
NRTTokyoSFOSan Francisco
Estimated from the boardsarr 09:00

Board estimate · gate and arrival times. Off blocks 17:10. No receiver coverage over open ocean.

Typical gate push+38 minmedian posted departure
Typical arrival−8 minmedian over 4 operations
Wins back in air~46 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
11-09
+15 gate · −30 arrival
11-08
+31 gate · −4 arrival
11-07
+50 gate · −12 arrival
11-06
+45 gate · +25 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
NRTTokyoOn-time likelyNRT delay board →
SFOSan FranciscoHigh riskSFO delay board →
NRT→SFOevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Weather-conditioned outlook for this flight right now

Measured, 90-day sample
47%Chance of 15+ min delay
2.8%Chance of cancellation
+17 minTypical airport delay in this weather

Driven mainly by SFO (San Francisco), currently flying IFR (instrument). 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 Tokyo

Forecast

Tue 10 Nov, local date

High12°Clikely 11°C to 14°C
Low8°Clikely 6°C to 9°C
  • 94% chance of rain

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 10 Nov, local date

High21°Clikely 20°C to 23°C
Low13°Clikely 12°C to 15°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.

How UA838 actually runs

Pro Flight Search has tracked every published board update for UA838 across the NRT and SFO boards: schedule changes, gate pushes and actual clocks. Usually lands on time. Based on 3 confirmed landings · 2/3 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 UA838 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
11-09NRT 16:55 17:10 (+15)SFO 09:30 09:00 (−30)
11-08NRT 16:55 17:26 (+31)SFO 09:30 09:26 (−4)
11-07NRT 16:55 17:45 (+50)SFO 09:30 09:18 (−12)
11-06NRT 16:55 17:40 (+45)SFO 09:30 09:55 (+25)

Aircraft

Recent tails: N2639U, N2737U, N2140U.

Board clocks recorded as NRT and SFO published them.

Planning around UA838? 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: UA838 Tokyo to San Francisco on-time performance, measured from the NRT and SFO airport boards.

Canonical URL
https://proflightsearch.com/flight/UA838
How we measure this →