Flight number record
UA 2328
United Airlines · Newark to San Francisco
- Route
- EWR → SFO
- Departs
- 15:00
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2328, check with United Airlines.
UA 2328 draws a C. About one flight in three arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 365 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.3%, so UA 2328 runs 12 points behind the country as a whole. Across a thousand flights that is about 119 extra late arrivals.
Key figures
On time
65.4%
Arrivals under 15 minutes late, of 356 completed flights
Avg delay
92 min
Across delayed arrivals only, not all flights
Cancelled
2.47%
National rate is 1.89%
1 hour+ late
16.0%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. Beyond the headline rate, 16.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 2328 flies
UA 2328 flies EWR to SFO without a single fixed slot. Its most common scheduled departure was 15:00, used on 123 of 365 flights, with 14:45 (103 flights) and 14:30 (53 flights) next.
- Departs 15:00123 flights33.7%
- Departs 14:45103 flights28.2%
- Departs 14:3053 flights14.5%
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 15:00 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and UA 2328 runs 7 points worse at 65.4%. 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 2328 next to EWR to SFO
Every carrier on EWR to SFO combined arrived on time 67.9% of the time across 4,349 flights, so UA 2328 is 3 points behind it. United flew 3,863 flights on the same city pair under all its flight numbers, including this one, and those ran 66.7% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2328 | 365 | 65.4% | 92 min | 2.47% | C |
| All United Airlines on EWR–SFO | 3,863 | 66.7% | 90 min | 2.43% | C |
| All carriers on EWR–SFO | 4,349 | 67.9% | 88 min | 2.30% | C |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2328 quarter by quarter
UA 2328 did not run the same all year. Its best quarter was Oct–Dec 2025 at 70.3% on time and its weakest Jul–Sep 2026 at 54.2%, a swing of 16 points on roughly 91 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 flights—
- Oct–Dec 202592 flights70.3%
- Jan–Mar 202690 flights68.2%
- Apr–Jun 202691 flights62.9%
- Jul–Sep 202662 flights54.2%
Scale runs 45% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2328 did best on Tuesday at 76.9% on time and worst on Sunday at 54.9%. Each day rests on about 52 flights, so a gap of 22 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 2328 runs when it is late
UA 2328 often beats the schedule: 90 of 356 completed flights, 25%, arrived 15 minutes or more early. The 123 late arrivals split 36 under half an hour, 30 between 30 and 60 minutes, and 57 an hour or more.
- 15+ min early90 flights25.3%
- Within 15 min143 flights40.2%
- 15–29 min late36 flights10.1%
- 30–59 min late30 flights8.4%
- 1–2 hours late27 flights7.6%
- 2+ hours late30 flights8.4%
Scale runs 0% to 100%.
Share of 356 completed flights by arrival against schedule.
28 of 121 late departures made up the time and arrived on time, 23% of them. In the other direction, 30 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 SFO.
The worst days
Worst days for UA 2328
The latest arrival of the period was on 4 January 2026, 15 hours 48 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 4 January 2026 | 15 hours 48 minutes | Carrier |
| 21 December 2025 | 9 hours 5 minutes | National Airspace System |
| 2 February 2026 | 7 hours 29 minutes | Carrier |
| 31 October 2025 | 6 hours 5 minutes | Carrier |
| 26 June 2026 | 5 hours | Carrier |
Delay causes
Why UA 2328 runs late
Carrier accounts for 42% of the 11,000 delay minutes carriers reported here, and the remaining four split what is left.
- 42%Carrier
- 35%National Airspace System
- 21%Late-arriving aircraft
- 2%Extreme weather
The largest share of delay minutes, 42%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,740 of the 11,000 delay minutes reported here. The split is drawn from 11,268 delay minutes reported on UA 2328.
Cancellations sit at 2.47% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
16.0% 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 2,565 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 two other city pairs in the data, including RSW to EWR (76) and SFO to RNO (37), but none flew often enough under UA 2328 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to EWR to SFO only.
One caution: this is a thin sample. 365 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 2328
For a booking, UA 2328 is a flight to put a long connection behind. 16.0% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- EWR to SFO, every carrier and departure
- SFO to EWR, the return direction
- United Airlines 1777 on the same route72.5%
- United Airlines 648 on the same route70.9%
- United Airlines 1343 on the same route64.1%
- United Airlines 2115 on the same route83.2%
- United Airlines 1227 on the same route69.3%
- United Airlines 1960 on the same route70.8%
- Newark Liberty International (EWR) 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.