UA2356 San FranciscoSFO · 10:35 BostonBOS · 19:29
UA2356 by United Airlines flies from San Francisco (SFO) to Boston (BOS) for the Mon, Aug 17 departure.
arrived at BOS · 30 min late
⚖ UA2356 typically leaves +31 and lands −14. The air wins minutes back.Where the minutes go
last 7 operations · gate push → arrivalThe 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 operationmedian arrival −14 min · 0 cancelled · 14 operations tracked
The route today
live boardsWeather lens
Weather-conditioned outlook for this flight right now
Measured, 90-day sampleDriven mainly by SFO (San Francisco), currently flying VFR (visual). For this route and airline, 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 →
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other San Francisco to Boston flights today
same route · United AirlinesIf UA2356 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 posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How UA2356 actually runs
Pro Flight Search has tracked every published board update for UA2356 across the SFO and BOS boards: schedule changes, gate pushes and actual clocks. Usually lands ~11 min early. Based on 14 confirmed landings · 11/14 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 UA2356 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationAircraft
Recent tails: N77558, N47291, N17574, N37445.
Board clocks recorded as SFO and BOS published them.
Planning around UA2356? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Pro Flight Search — UA2356 San Francisco to Boston on-time performance, measured from the SFO and BOS airport boards.
https://proflightsearch.com/flight/UA2356
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