Flight number record
UA 2328
United Airlines · Newark to San Francisco
- Route
- EWR → SFO
- Departs
- 15:00
- Flights
- 365
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 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 3 minutes early.
The national on-time rate over the same period is 77.6%, so UA 2328 runs 10 points behind the country as a whole. Across a thousand flights that is about 97 extra late arrivals.
Key figures
On time
67.9%
Arrivals under 15 minutes late, of 358 completed flights
Avg delay
100 min
Across delayed arrivals only, not all flights
Cancelled
1.92%
National rate is 1.81%
1 hour+ late
16.2%
National rate is 8.1%
These figures cover 365 flights between July 2025 and June 2026. Beyond the headline rate, 16.2% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
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 15:55 (77 flights) and 14:30 (53 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 15:00123 flights33.7%
- Departs 15:5577 flights21.1%
- Departs 14:3053 flights14.5%
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 15:00 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and UA 2328 runs 5 points worse at 67.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
UA 2328 next to EWR to SFO
Every carrier on EWR to SFO combined arrived on time 69.8% of the time across 4,403 flights, so UA 2328 is 2 points behind it. United flew 3,793 flights on the same city pair under all its flight numbers, including this one, and those ran 68.9% on time. Across its whole network United Airlines managed 79.0%, which this flight trails by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2328 | 365 | 67.9% | 100 min | 1.92% | C |
| All United Airlines on EWR–SFO | 3,793 | 68.9% | 92 min | 2.53% | C |
| All carriers on EWR–SFO | 4,403 | 69.8% | 89 min | 2.32% | C |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 2328 quarter by quarter
Quarter by quarter UA 2328 held fairly steady: 70.0% in Jul–Sep 2025, 70.3% in Oct–Dec 2025, 68.2% in Jan–Mar 2026 and 62.9% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202592 flights70.0%
- Oct–Dec 202592 flights70.3%
- Jan–Mar 202690 flights68.2%
- Apr–Jun 202691 flights62.9%
Scale runs 55% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2328 did best on Tuesday at 83.0% on time and worst on Sunday at 56.9%. Each day rests on about 52 flights, so a gap of 26 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 2328 runs late
One category carries most of the weight here. Carrier accounts for 42% of the 11,000 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.
- 42%Carrier
- 33%National Airspace System
- 19%Late-arriving aircraft
- 5%Extreme weather
The largest share of delay minutes, 42%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 4,855 of the 11,000 delay minutes reported here. The split is drawn from 11,437 delay minutes reported on UA 2328.
Cancellations sit at 1.92% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 16.2% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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 (107) 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. 16.2% 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 648 on the same route70.3%
- United Airlines 1343 on the same route69.4%
- United Airlines 2115 on the same route83.9%
- United Airlines 1777 on the same route72.4%
- United Airlines 1960 on the same route73.7%
- United Airlines 1227 on the same route73.0%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.