Flight number record
UA 2145
United Airlines · Chicago to Sacramento
- Route
- ORD → SMF
- Departs
- 09:04
- Flights
- 289
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2145, check with United Airlines.
UA 2145 lands a B+, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 55 minutes on average. That rests on 289 flights, with a median arrival 6 minutes early.
Key figures
On time
79.6%
Arrivals under 15 minutes late, of 289 completed flights
Avg delay
53 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
4.8%
National rate is 8.3%
These figures cover 289 flights between September 2025 and August 2026. The median arrival is 6 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 2145 flies
UA 2145 flies ORD to SMF without a single fixed slot. Its most common scheduled departure was 09:04, used on 119 of 289 flights, with 09:09 (58 flights) and 09:05 (32 flights) next.
- Departs 09:04119 flights41.2%
- Departs 09:0958 flights20.1%
- Departs 09:0532 flights11.1%
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 09:04 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 2145 runs 4 points worse at 79.6%. 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 2145 next to ORD to SMF
Every carrier on ORD to SMF combined arrived on time 67.3% of the time across 1,347 flights, so UA 2145 is 12 points ahead of it. United flew 991 flights on the same city pair under all its flight numbers, including this one, and those ran 69.4% on time. Across its whole network United Airlines managed 78.8%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2145thin sample | 289 | 79.6% | 53 min | 0.00% | B+ |
| All United Airlines on ORD–SMF | 991 | 69.4% | 65 min | 1.41% | C |
| All carriers on ORD–SMF | 1,347 | 67.3% | 64 min | 1.63% | C |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2145 quarter by quarter
UA 2145 did not run the same all year. Its best quarter was Jul–Sep 2026 at 87.1% on time and its weakest Oct–Dec 2025 at 74.6%, a swing of 13 points on roughly 72 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 flights74.6%
- Jan–Mar 202690 flights76.7%
- Apr–Jun 202670 flights81.4%
- Jul–Sep 202662 flights87.1%
Scale runs 65% to 95%.
By weekday, UA 2145 did best on Monday at 88.1% on time and worst on Saturday at 70.7%. Each day rests on about 41 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 2145 runs when it is late
UA 2145 often beats the schedule: 99 of 289 completed flights, 34%, arrived 15 minutes or more early. The 59 late arrivals split 27 under half an hour, 18 between 30 and 60 minutes, and 14 an hour or more.
- 15+ min early99 flights34.3%
- Within 15 min131 flights45.3%
- 15–29 min late27 flights9.3%
- 30–59 min late18 flights6.2%
- 1–2 hours late8 flights2.8%
- 2+ hours late6 flights2.1%
Scale runs 0% to 100%.
Share of 289 completed flights by arrival against schedule.
11 of 47 late departures made up the time and arrived on time, 23% of them. In the other direction, 23 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 SMF.
The worst days
Worst days for UA 2145
The latest arrival of the period was on 6 March 2026, 4 hours 5 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On four of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 6 March 2026 | 4 hours 5 minutes | Carrier |
| 14 January 2026 | 3 hours 18 minutes | Late-arriving aircraft |
| 14 April 2026 | 2 hours 51 minutes | Late-arriving aircraft |
| 9 July 2026 | 2 hours 23 minutes | Late-arriving aircraft |
| 11 March 2026 | 2 hours 9 minutes | Late-arriving aircraft |
Delay causes
Why UA 2145 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 3,097 reported delay minutes.
- 38%Carrier
- 35%Late-arriving aircraft
- 21%National Airspace System
- 6%Extreme weather
35% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,097 reported delay minutes here, that single category outweighs weather by 6 to one. The split is drawn from 3,097 delay minutes reported on UA 2145.
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 4.8% 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 1,781 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 PDX to ORD (31), SFO to ORD (24) and ORD to EWR (21), but none flew often enough under UA 2145 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ORD to SMF only.
One caution: this is a thin sample. 289 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 2145
For a booking, read UA 2145 as 79.6% on time with 0.00% cancelled over 289 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ORD to SMF, every carrier and departure
- SMF to ORD, the return direction
- United Airlines 1920 on the same route62.9%
- Chicago O'Hare International (ORD) delay statistics
- Sacramento International (SMF) 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.