Flight profile · United Airlines
UA2356
Las Vegas (LAS) to San Francisco (SFO) · scheduled 8:00 AM – 9:41 AM
How UA2356 performs
789 operations, February 2024 – July 2026.
UA2356 arrived on time 61.1% of the time, against 66.4% for all LAS → SFO flights, so this departure is 5.3 percentage points worse than the route as a whole. Against United Airlines’ own flights on this route it is 11.2 points worse.
Source: US DOT Bureau of Transportation Statistics · 789 operations, February 2024 – July 2026 · If UA2356 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
What stands out
How UA2356 compares to other flight numbers, not just to itself.
This flight runs unusually far behind the carrier's own average on this route, worse than 91% of 11,589 comparable flight numbers.
61.1% on time for this specific departure, against 72.3% for the same carrier's other flights on this route.
Source: FlyerIntel analysis of US DOT BTS data · February 2024 – July 2026 · The one thing about this specific departure that ranks most extreme against every other published flight number, out of everything FlyerIntel checks — shown only when something clears a real statistical bar, not for every flight.
Where UA2356 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| UA2356 | 61.1% | 1.01% | 7 min | 7.2% | 789 |
| United Airlines on LAS → SFO | 72.3% | 0.93% | -4 min | 8.8% | 7,609 |
| All LAS → SFO flights | 66.4% | 1.01% | 0 min | 10.6% | 18,262 |
Source: FlyerIntel analysis of US DOT BTS data · February 2024 – July 2026
Why UA2356 runs late
Where US DOT attributed the delay minutes on this flight.
airspace and airport capacity, including weather-driven flow control
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for UA2356 on LAS → SFO. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering February 2024 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies UA2356 comes in late, and what that does to the departure.
UA2356 is usually the aircraft’s first flight of the day: the schedule gives it a median of 10 hours on the ground at LAS, so its “inbound” is mostly the aircraft’s arrival the evening before.
When the aircraft came in 15 or more minutes late, UA2356 pushed back an average of 8 minutes late; when it came in on time or early, an average of 3 minutes late.
Each departure is matched to the flight the same aircraft flew into LAS just before it, using the tail number in the DOT file, 671 of 781 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late | Left 15+ late after a late inbound | Left 15+ late after an on-time inbound |
|---|---|---|---|
| UA2356 | 24% | 23% | 16% |
| Network, same turn | 29% | 12% | 9% |
A night on the ground absorbs most of a late arrival, so a late inbound matters far less on a turn this long than on a same-day one.
The network row is every flight with a scheduled turn of 6 hours or more, usually overnight. How often UA2356’s aircraft landed 15 or more minutes late is lower than the network’s and, once the aircraft was late, how often UA2356 left 15 or more minutes late is higher than the network’s.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering February 2024 – July 2026
From pushback to gate
When it leaves LAS late, does that still matter by the time it reaches SFO?
UA2356 pushes back an average of 6.6 minutes late and arrives a further 8.1 minutes behind that. This departure loses ground between the two gates rather than recovering it, so a late pushback here tends to get worse on the way, not better. It spends 32.5 minutes on the taxiways at LAS, 14.9 minutes longer than a typical LAS departure in the same hour.
On arrival at SFO, UA2356 spends 9.9 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is 2.0 minutes longer than a typical SFO arrival (7.9 min).
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached SFO. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 37,259 departures from LAS scheduled in the clock hour UA2356 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at SFO (436,060 flights), not just UA2356’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · February 2024 – July 2026
The hour it leaves LAS
Part of any flight’s record belongs to the clock rather than to the flight. UA2356 has one departure time, so this is what that time is worth.
On-time arrival rate. 37,259 departures from LAS are scheduled in the 8 AM–9 AM hour over the period, against 569,617 across the whole day.
UA2356 is scheduled out of LAS at 8:00 AM, in the 8 AM–9 AM bank. Departures from LAS in that hour arrive on time 86.4% of the time against 78.0% across the airport’s whole day — the slot alone is worth 8.4 points better before anything about this particular flight is considered.
The two airport figures cover every departure from LAS to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · February 2024 – July 2026 · Hours below 120 departures are not scored.
Other routes UA2356 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| SFO→BOS San Francisco to Boston | June 26, 2025 – July 31, 2026 | 364 | 62.7% |
| SFO→MSY San Francisco to New Orleans | November 28, 2023 – June 25, 2025 | 519 | 82.5% |
| MSY→EWR New Orleans to Newark | February 6–10, 2025 | 3 | — |
| MSY→ORD New Orleans to Chicago | November 30, 2024 – December 1, 2024 | 2 | — |
| ORD→BOS Chicago to Boston | November 30, 2024 – December 1, 2024 | 2 | — |
| MSY→IAH New Orleans to Houston | July 5, 2023 – February 14, 2024 | 128 | 63.0% |
Because the same number has served different journeys, the statistics above describe only the route UA2356 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
51 min late
against a median of 7 min late
Percentiles over 789 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering February 2024 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| UA574 | United Airlines | 76.2% | 5 min early | 1,030 |
| UA2047 | United Airlines | 73.6% | 4 min early | 1,027 |
| AS613 | Alaska Airlines | 72.3% | 5 min early | 926 |
| F93019 | Frontier Airlines | 64.8% | 0 min early | 742 |
| UA2356 this flight | United Airlines | 61.1% | 7 min late | 789 |
| F94401 | Frontier Airlines | 54.9% | 7 min late | 695 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. UA2356 is placed in the same ordering rather than left out of it; the rows around it are the most punctual departures on the route, not all of them, so this is a comparison and not a rank. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 789 records of UA2356 operating LAS → SFO, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
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