Flight number record
UA 2091
United Airlines · San Francisco to Chicago
- Route
- SFO → ORD
- Departs
- 06:00
- Flights
- 340
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2091, check with United Airlines.
UA 2091 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 15 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 55 minutes. That rests on 340 flights, with a median arrival 16 minutes early.
Set against the rest of the country, UA 2091's record is 15 points better than the US average of 77.3%. That gap is worth roughly 150 fewer late arrivals for every thousand flights.
Key figures
On time
92.3%
Arrivals under 15 minutes late, of 338 completed flights
Avg delay
54 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
2.1%
National rate is 8.3%
These figures cover 340 flights between September 2025 and August 2026. The median arrival is 16 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When UA 2091 flies
UA 2091 flies SFO to ORD without a single fixed slot. Its most common scheduled departure was 06:00, used on 93 of 340 flights, with 06:05 (82 flights) and 06:45 (81 flights) next.
- Departs 06:0093 flights27.4%
- Departs 06:0582 flights24.1%
- Departs 06:4581 flights23.8%
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 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and UA 2091 runs 3 points better at 92.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
UA 2091 next to SFO to ORD
Every carrier on SFO to ORD combined arrived on time 75.0% of the time across 5,650 flights, so UA 2091 is 17 points ahead of it. United flew 3,885 flights on the same city pair under all its flight numbers, including this one, and those ran 76.6% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2091thin sample | 340 | 92.3% | 54 min | 0.00% | A+ |
| All United Airlines on SFO–ORD | 3,885 | 76.6% | 70 min | 0.67% | B+ |
| All carriers on SFO–ORD | 5,650 | 75.0% | 85 min | 0.96% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2091 quarter by quarter
Quarter by quarter UA 2091 held fairly steady: 90.2% in Oct–Dec 2025, 92.0% in Jan–Mar 2026, 94.5% in Apr–Jun 2026 and 91.8% in Jul–Sep 2026. A spread of 4 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 20256 flights—
- Oct–Dec 202592 flights90.2%
- Jan–Mar 202689 flights92.0%
- Apr–Jun 202691 flights94.5%
- Jul–Sep 202662 flights91.8%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2091 ranged from 85.7% on Friday to 95.7% on Tuesday. With about 49 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 2091 runs when it is late
UA 2091 often beats the schedule: 182 of 338 completed flights, 54%, arrived 15 minutes or more early. Most of the lateness is short. 15 of the 26 late arrivals were under half an hour behind, and 7 reached an hour or more.
- 15+ min early182 flights53.8%
- Within 15 min130 flights38.5%
- 15–29 min late15 flights4.4%
- 30–59 min late4 flights1.2%
- 1–2 hours late4 flights1.2%
- 2+ hours late3 flights0.9%
Scale runs 0% to 100%.
Share of 338 completed flights by arrival against schedule.
Only 19 of 338 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for UA 2091
The latest arrival of the period was on 29 November 2025, 4 hours 20 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 29 November 2025 | 4 hours 20 minutes | National Airspace System |
| 10 November 2025 | 3 hours 48 minutes | National Airspace System |
| 4 July 2026 | 2 hours 10 minutes | Late-arriving aircraft |
| 7 December 2025 | 1 hour 28 minutes | National Airspace System |
| 20 January 2026 | 1 hour 21 minutes | National Airspace System |
Delay causes
Why UA 2091 runs late
National Airspace System accounts for 72% of the 1,404 delay minutes carriers reported here, and the remaining four split what is left.
- 72%National Airspace System
- 19%Carrier
- 9%Late-arriving aircraft
72% 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 1,015 minutes out of 1,404, against a national NAS share of 21%. The split is drawn from 1,404 delay minutes reported on UA 2091.
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
Badly late arrivals are rare here: only 2.1% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
At 1,846 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 six other city pairs in the data, including ORD to RDU (194), ORD to CLE (36) and ORD to IAH (31), but none flew often enough under UA 2091 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SFO to ORD only.
One caution: this is a thin sample. 340 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 2091
For a booking, UA 2091 has one of the better records a US domestic flight can show: 92.3% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SFO to ORD, every carrier and departure
- ORD to SFO, the return direction
- American Airlines 2614 on the same route91.2%
- United Airlines 1482 on the same route79.5%
- San Francisco International (SFO) delay statistics
- Chicago O'Hare International (ORD) 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
- Worst months to fly in the US, ranked by the data
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.