Flight number record
UA 751
United Airlines · San Francisco to Las Vegas
- Route
- SFO → LAS
- Departs
- 16:55
- Flights
- 356
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 751, check with United Airlines.
UA 751 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.3%. The late ones land roughly 50 minutes behind schedule. That rests on 356 flights, with a median arrival 1 minute late.
The national on-time rate over the same period is 77.3%, so UA 751 runs 9 points behind the country as a whole. Across a thousand flights that is about 85 extra late arrivals.
Key figures
On time
68.8%
Arrivals under 15 minutes late, of 353 completed flights
Avg delay
51 min
Across delayed arrivals only, not all flights
Cancelled
0.56%
National rate is 1.89%
1 hour+ late
9.1%
National rate is 8.3%
These figures cover 356 flights between September 2025 and August 2026. Beyond the headline rate, 9.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 751 flies
UA 751 flies SFO to LAS without a single fixed slot. Its most common scheduled departure was 16:55, used on 86 of 356 flights, with 17:37 (67 flights) and 16:48 (56 flights) next.
- Departs 16:5586 flights24.2%
- Departs 17:3767 flights18.8%
- Departs 16:4856 flights15.7%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 16:55 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and UA 751 runs 3 points worse at 68.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
UA 751 next to SFO to LAS
Every carrier on SFO to LAS combined arrived on time 70.2% of the time across 6,140 flights, so UA 751 is about level with it. United flew 2,817 flights on the same city pair under all its flight numbers, including this one, and those ran 76.8% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 751thin sample | 356 | 68.8% | 51 min | 0.56% | C+ |
| All United Airlines on SFO–LAS | 2,817 | 76.8% | 55 min | 0.35% | B+ |
| All carriers on SFO–LAS | 6,140 | 70.2% | 65 min | 0.70% | C+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 751 quarter by quarter
UA 751 did not run the same all year. Its best quarter was Jan–Mar 2026 at 80.0% on time and its weakest Jul–Sep 2026 at 58.5%, a swing of 22 points on roughly 71 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights66.7%
- Oct–Dec 202592 flights67.8%
- Jan–Mar 202690 flights80.0%
- Apr–Jun 202691 flights65.6%
- Jul–Sep 202653 flights58.5%
Scale runs 50% to 85%.
By weekday, UA 751 did best on Saturday at 87.5% on time and worst on Thursday at 54.9%. Each day rests on about 51 flights, so a gap of 33 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 751 runs when it is late
The 110 late arrivals split 40 under half an hour, 38 between 30 and 60 minutes, and 32 an hour or more.
- 15+ min early44 flights12.5%
- Within 15 min199 flights56.4%
- 15–29 min late40 flights11.3%
- 30–59 min late38 flights10.8%
- 1–2 hours late26 flights7.4%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 353 completed flights by arrival against schedule.
21 of 113 late departures made up the time and arrived on time, 19% of them. In the other direction, 18 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at LAS.
The worst days
Worst days for UA 751
The latest arrival of the period was on 5 November 2025, 3 hours 14 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 5 November 2025 | 3 hours 14 minutes | Late-arriving aircraft |
| 19 June 2026 | 3 hours 13 minutes | National Airspace System |
| 6 March 2026 | 2 hours 47 minutes | Late-arriving aircraft |
| 16 February 2026 | 2 hours 29 minutes | National Airspace System |
| 27 February 2026 | 2 hours 29 minutes | Late-arriving aircraft |
Delay causes
Why UA 751 runs late
Late-arriving aircraft accounts for 49% of the 5,630 delay minutes carriers reported here, and the remaining four split what is left.
- 49%Late-arriving aircraft
- 30%National Airspace System
- 21%Carrier
49% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,630 reported delay minutes here, that single category outweighs weather by 49 to one. The split is drawn from 5,630 delay minutes reported on UA 751.
Cancellations are rare at 0.56%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
9.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The same number turns up on three other city pairs in the data, including PDX to SFO (65), ORD to PDX (21) and LAS to ORD (2), but none flew often enough under UA 751 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SFO to LAS only.
One caution: this is a thin sample. 356 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking UA 751
For a booking, read UA 751 as 68.8% on time with 0.56% cancelled over 356 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SFO to LAS, every carrier and departure
- LAS to SFO, the return direction
- United Airlines 1995 on the same route79.4%
- United Airlines 406 on the same route76.3%
- Alaska Airlines 776 on the same route59.2%
- United Airlines 611 on the same route76.1%
- Alaska Airlines 718 on the same route87.5%
- Frontier Airlines 4158 on the same route60.9%
- San Francisco International (SFO) delay statistics
- Harry Reid International (LAS) delay statistics
- United Airlines on-time record
- Every United Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means United Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.