Flight number record
UA 2091
United Airlines · San Francisco to Chicago
- Route
- SFO → ORD
- Departs
- 06:45
- Flights
- 278
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 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 77.6%. When something does go wrong the average delay runs about an hour. That rests on 278 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 77.6%. That gap is worth roughly 148 fewer late arrivals for every thousand flights.
Key figures
On time
92.4%
Arrivals under 15 minutes late, of 277 completed flights
Avg delay
57 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.81%
1 hour+ late
2.2%
National rate is 8.1%
These figures cover 278 flights between July 2025 and June 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.
Schedule
When UA 2091 flies
UA 2091 flies SFO to ORD without a single fixed slot. Its most common scheduled departure was 06:45, used on 81 of 278 flights, with 06:00 (72 flights) and 06:30 (52 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 06:4581 flights29.1%
- Departs 06:0072 flights25.9%
- Departs 06:3052 flights18.7%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 06:45 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 92.4%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Against the route
UA 2091 next to SFO to ORD
Every carrier on SFO to ORD combined arrived on time 76.5% of the time across 5,628 flights, so UA 2091 is 16 points ahead of it. United flew 3,815 flights on the same city pair under all its flight numbers, including this one, and those ran 78.3% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2091thin sample | 278 | 92.4% | 57 min | 0.00% | A+ |
| All United Airlines on SFO–ORD | 3,815 | 78.3% | 71 min | 1.02% | B |
| All carriers on SFO–ORD | 5,628 | 76.5% | 85 min | 1.30% | B |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | 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 and 94.5% in Apr–Jun 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%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2091 did best on Saturday at 97.5% on time and worst on Friday at 85.0%. Each day rests on about 40 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 2091 runs late
One category carries most of the weight here. National Airspace System accounts for 82% of the 1,195 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 82%National Airspace System
- 18%Carrier
82% 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 976 minutes out of 1,195, against a national NAS share of 21%. The split is drawn from 1,195 delay minutes reported on UA 2091.
Cancellations are rare at 0.00%, below the national 1.81% 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 2.2% land an hour or more behind schedule, against 8.1% 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 seven other city pairs in the data, including ORD to RDU (132), BNA to EWR (49) and ORD to DSM (37), 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. 278 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: 92.4% 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 route91.3%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.