UA1665United Airlines · SFO → BOS
live · 9m ago
Route confirmed United Airlines

UA1665 San FranciscoSFO · 23:20 BostonBOS · 07:56

UA1665 by United Airlines flies from San Francisco (SFO) to Boston (BOS) for the Sun, Nov 8 departure.

Right nowEn route to Boston · off blocks 23:16 · 4 min early
En route

en route from SFO to BOS

En routeUA1665 · position estimated
SFOSan FranciscoBOSBoston
Estimated from the boards

Board estimate · gate and arrival times. Off blocks 23:16 · typical taxi-out at SFO ≈ 11 min. No receiver coverage over open ocean.

Typical arrival−2 minmedian over 3 operations

Where the minutes go

last 3 operations · gate push → arrival
0+30+60+90 min
11-09
−4 gate · −2 arrival
11-08
−4 gate · +1 arrival
11-07
−2 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
SFOSan FranciscoModerate riskSFO delay board →
BOSBostonOn-time likelyBOS delay board →
SFO→BOSevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Weather-conditioned outlook for this flight right now

Measured, 90-day sample
51%Chance of 15+ min delay
2.2%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 San Francisco

Forecast

Tue 10 Nov, local date

High22°Clikely 20°C to 24°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.

Tomorrow at Boston

Forecast

Tue 10 Nov, local date

High14°Clikely 12°C to 15°C
Low7°Clikely 5°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 San Francisco to Boston flights today

same route · United Airlines
UA2647departs 08:10
UA2356departs 10:40
UA8156departs 10:50
UA1372departs 12:45
UA8172departs 12:45
UA8222departs 13:15

If UA1665 is cancelled, these are the other United Airlines nonstop flights from San Francisco to Boston on the same day, with scheduled departure times in SFO 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 UA1665 actually runs

Pro Flight Search has tracked every published board update for UA1665 across the SFO and BOS boards: schedule changes, gate pushes and actual clocks. Early read: no clear pattern yet. Only 3 completed legs so far: landed -2 min. Not enough to call it.

The verdict above is that record speaking, so it reflects how UA1665 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
11-09SFO 23:20 23:16 (−4)BOS 07:56 07:54 (−2)
11-08SFO 23:20 23:16 (−4)BOS 07:56 07:57 (+1)
11-07SFO 23:20BOS 07:56 07:54 (−2)

Board clocks recorded as SFO and BOS published them.

Planning around UA1665? 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: UA1665 San Francisco to Boston on-time performance, measured from the SFO and BOS airport boards.

Canonical URL
https://proflightsearch.com/flight/UA1665
How we measure this →