Flight number record
UA 2611
United Airlines · Houston to San Francisco
- Route
- IAH → SFO
- Departs
- 12:25
- Flights
- 263
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2611, check with United Airlines.
UA 2611 lands a B+, level with the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 263 flights, with a median arrival 12 minutes early.
Key figures
On time
76.8%
Arrivals under 15 minutes late, of 263 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
11.0%
National rate is 8.3%
These figures cover 263 flights between September 2025 and August 2026. Beyond the headline rate, 11.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 2611 flies
UA 2611 flies IAH to SFO without a single fixed slot. Its most common scheduled departure was 12:25, used on 58 of 263 flights, with 12:30 (48 flights) and 12:27 (37 flights) next.
- Departs 12:2558 flights22.1%
- Departs 12:3048 flights18.3%
- Departs 12:2737 flights14.1%
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 12:25 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 2611 runs level with that at 76.8%. 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 2611 next to IAH to SFO
Every carrier on IAH to SFO combined arrived on time 78.2% of the time across 3,578 flights, so UA 2611 is about level with it. Across its whole network United Airlines managed 78.8%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2611thin sample | 263 | 76.8% | 75 min | 0.00% | B+ |
| All United Airlines on IAH–SFO | 3,578 | 78.2% | 62 min | 0.42% | B+ |
| All carriers on IAH–SFO | 3,578 | 78.2% | 62 min | 0.42% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2611 quarter by quarter
UA 2611 did not run the same all year. Its best quarter was Jan–Mar 2026 at 92.2% on time and its weakest Apr–Jun 2026 at 56.5%, a swing of 36 points on roughly 88 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.
- Oct–Dec 202567 flights83.6%
- Jan–Mar 202690 flights92.2%
- Apr–Jun 202685 flights56.5%
- Jul–Sep 202621 flights—
Scale runs 50% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2611 did best on Tuesday at 84.2% on time and worst on Monday at 65.8%. Each day rests on about 38 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 2611 runs when it is late
UA 2611 often beats the schedule: 118 of 263 completed flights, 45%, arrived 15 minutes or more early. The 61 late arrivals split 14 under half an hour, 18 between 30 and 60 minutes, and 29 an hour or more.
- 15+ min early118 flights44.9%
- Within 15 min84 flights31.9%
- 15–29 min late14 flights5.3%
- 30–59 min late18 flights6.8%
- 1–2 hours late21 flights8.0%
- 2+ hours late8 flights3.0%
Scale runs 0% to 100%.
Share of 263 completed flights by arrival against schedule.
9 of 60 late departures made up the time and arrived on time, 15% of them. 10 flights left on time and still arrived late.
The worst days
Worst days for UA 2611
The latest arrival of the period was on 16 March 2026, 11 hours 13 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as national airspace system delay.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 16 March 2026 | 11 hours 13 minutes | Carrier |
| 20 April 2026 | 3 hours 5 minutes | National Airspace System |
| 21 December 2025 | 2 hours 58 minutes | National Airspace System |
| 25 December 2025 | 2 hours 51 minutes | National Airspace System |
| 7 May 2026 | 2 hours 46 minutes | Carrier |
Delay causes
Why UA 2611 runs late
National Airspace System accounts for 58% of the 4,595 delay minutes carriers reported here, and the remaining four split what is left.
- 58%National Airspace System
- 20%Carrier
- 18%Late-arriving aircraft
- 4%Extreme weather
58% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 2,665 minutes out of 4,595, against a national NAS share of 21%. The split is drawn from 4,595 delay minutes reported on UA 2611.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
11.0% 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.
At 1,635 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The same number turns up on seven other city pairs in the data, including MCO to IAH (230), SFO to PDX (179) and PHL to IAH (37), but none flew often enough under UA 2611 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAH to SFO only.
One caution: this is a thin sample. 263 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 2611
For a booking, read UA 2611 as 76.8% on time with 0.00% cancelled over 263 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- IAH to SFO, every carrier and departure
- SFO to IAH, the return direction
- United Airlines 2358 on the same route72.0%
- United Airlines 1768 on the same route89.1%
- United Airlines 589 on the same route79.6%
- United Airlines 487 on the same route97.2%
- United Airlines 1609 on the same route80.7%
- George Bush Intercontinental (IAH) delay statistics
- San Francisco International (SFO) 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
- How often a connection fails at the major US hubs
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.