Flight number record
UA 1558
United Airlines · Newark to San Francisco
- Route
- EWR → SFO
- Departs
- 19:20
- Flights
- 267
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1558, check with United Airlines.
UA 1558 earns an F−, which is as low as this site's scale goes for a reason. Only 49.8% of flights arrive inside the 15-minute window, 28 points worse than the national rate of 77.3%. Late arrivals average an hour and a half. Treat any tight connection here as a coin flip. That rests on 267 flights, with a median arrival 15 minutes late.
The national on-time rate over the same period is 77.3%, so UA 1558 runs 28 points behind the country as a whole. Across a thousand flights that is about 275 extra late arrivals.
Key figures
On time
49.8%
Arrivals under 15 minutes late, of 257 completed flights
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
3.75%
National rate is 1.89%
1 hour+ late
19.8%
National rate is 8.3%
These figures cover 267 flights between September 2025 and August 2026. Beyond the headline rate, 19.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 1558 flies
UA 1558 flies EWR to SFO without a single fixed slot. Its most common scheduled departure was 19:20, used on 91 of 267 flights, with 20:15 (72 flights) and 20:20 (66 flights) next.
- Departs 19:2091 flights34.1%
- Departs 20:1572 flights27.0%
- Departs 20:2066 flights24.7%
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 19:20 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and UA 1558 runs 18 points worse at 49.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
UA 1558 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 1558 is 18 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 29 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1558thin sample | 267 | 49.8% | 84 min | 3.75% | F− |
| 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 1558 quarter by quarter
UA 1558 did not run the same all year. Its best quarter was Jan–Mar 2026 at 55.8% on time and its weakest Jul–Sep 2026 at 36.5%, a swing of 19 points on roughly 67 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 20255 flights—
- Oct–Dec 202582 flights50.6%
- Jan–Mar 202646 flights55.8%
- Apr–Jun 202678 flights51.3%
- Jul–Sep 202656 flights36.5%
Scale runs 30% to 60%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1558 did best on Tuesday at 68.4% on time and worst on Thursday at 35.7%. Each day rests on about 38 flights, so a gap of 33 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1558 runs when it is late
The 129 late arrivals split 30 under half an hour, 48 between 30 and 60 minutes, and 51 an hour or more.
- 15+ min early55 flights21.4%
- Within 15 min73 flights28.4%
- 15–29 min late30 flights11.7%
- 30–59 min late48 flights18.7%
- 1–2 hours late25 flights9.7%
- 2+ hours late26 flights10.1%
Scale runs 0% to 100%.
Share of 257 completed flights by arrival against schedule.
18 of 115 late departures made up the time and arrived on time, 16% of them. In the other direction, 32 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 1558
The latest arrival of the period was on 27 July 2026, 11 hours 3 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 July 2026 | 11 hours 3 minutes | Carrier |
| 9 August 2026 | 9 hours 41 minutes | Carrier |
| 1 June 2026 | 6 hours 1 minute | Late-arriving aircraft |
| 26 December 2025 | 5 hours 39 minutes | Late-arriving aircraft |
| 21 July 2026 | 4 hours 14 minutes | Late-arriving aircraft |
Delay causes
Why UA 1558 runs late
Late-arriving aircraft accounts for 44% of the 11,000 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Late-arriving aircraft
- 30%Carrier
- 25%National Airspace System
- 2%Extreme weather
44% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 11,000 reported delay minutes here, that single category outweighs weather by 26 to one. The split is drawn from 10,873 delay minutes reported on UA 1558.
Cancellations run at 3.75%, against 1.89% nationally. That is about one flight in 25 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
19.8% 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 seven other city pairs in the data, including MKE to DEN (37), ORD to CHS (24) and PBI to EWR (24), but none flew often enough under UA 1558 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. 267 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 1558
For a booking, the cancellation rate is the figure to plan around on UA 1558: 3.75% of its 267 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.
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 2328 on the same route65.4%
- United Airlines 1343 on the same route64.1%
- United Airlines 2115 on the same route83.2%
- United Airlines 1227 on the same route69.3%
- 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
- 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.