Flight number record
UA 611
United Airlines · San Francisco to Las Vegas
- Route
- SFO → LAS
- Departs
- 11:00
- Flights
- 312
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 611, check with United Airlines.
UA 611 lands a B+, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by roughly 45 minutes on average. That rests on 312 flights, with a median arrival 1 minute late.
Key figures
On time
76.1%
Arrivals under 15 minutes late, of 310 completed flights
Avg delay
47 min
Across delayed arrivals only, not all flights
Cancelled
0.64%
National rate is 1.89%
1 hour+ late
5.2%
National rate is 8.3%
These figures cover 312 flights between September 2025 and August 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.
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Schedule
When UA 611 flies
UA 611 flies SFO to LAS without a single fixed slot. Its most common scheduled departure was 11:00, used on 106 of 312 flights, with 10:42 (82 flights) and 10:40 (56 flights) next.
- Departs 11:00106 flights34.0%
- Departs 10:4282 flights26.3%
- Departs 10:4056 flights17.9%
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 11:00 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 611 runs 2 points worse at 76.1%. 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 611 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 611 is 6 points ahead of 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 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 611thin sample | 312 | 76.1% | 47 min | 0.64% | B+ |
| 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 611 quarter by quarter
UA 611 did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.3% on time and its weakest Jul–Sep 2026 at 59.7%, a swing of 24 points on roughly 62 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 flights83.3%
- Oct–Dec 202592 flights78.9%
- Jan–Mar 202687 flights81.6%
- Apr–Jun 202641 flights78.0%
- Jul–Sep 202662 flights59.7%
Scale runs 50% to 90%.
By weekday, UA 611 did best on Saturday at 82.2% on time and worst on Monday at 61.4%. Each day rests on about 45 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 611 runs when it is late
The 74 late arrivals split 33 under half an hour, 25 between 30 and 60 minutes, and 16 an hour or more.
- 15+ min early24 flights7.7%
- Within 15 min212 flights68.4%
- 15–29 min late33 flights10.6%
- 30–59 min late25 flights8.1%
- 1–2 hours late12 flights3.9%
- 2+ hours late4 flights1.3%
Scale runs 0% to 100%.
Share of 310 completed flights by arrival against schedule.
8 of 58 late departures made up the time and arrived on time, 14% of them. In the other direction, 24 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 611
The latest arrival of the period was on 5 July 2026, 4 hours 47 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across July, May, August and January, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 5 July 2026 | 4 hours 47 minutes | Late-arriving aircraft |
| 28 May 2026 | 3 hours 24 minutes | Late-arriving aircraft |
| 9 August 2026 | 2 hours 7 minutes | Carrier |
| 27 July 2026 | 2 hours 4 minutes | Carrier |
| 1 January 2026 | 1 hour 50 minutes | National Airspace System |
Delay causes
Why UA 611 runs late
Late-arriving aircraft accounts for 48% of the 3,480 delay minutes carriers reported here, and the remaining four split what is left.
- 48%Late-arriving aircraft
- 34%National Airspace System
- 19%Carrier
48% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,480 reported delay minutes here, that single category outweighs weather by 48 to one. The split is drawn from 3,480 delay minutes reported on UA 611.
Cancellations are rare at 0.64%, 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
5.2% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last roughly 45 minutes, which a normal layover absorbs.
The same number turns up on eight other city pairs in the data, including BNA to SFO (55), DTW to SFO (53) and TPA to SFO (47), but none flew often enough under UA 611 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. 312 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 611
For a booking, read UA 611 as 76.1% on time with 0.64% cancelled over 312 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 751 on the same route68.8%
- United Airlines 406 on the same route76.3%
- Alaska Airlines 776 on the same route59.2%
- 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.