Flight number record
UA 515
United Airlines · Newark to San Antonio
- Route
- EWR → SAT
- Departs
- 12:20
- Flights
- 362
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 515, check with United Airlines.
UA 515 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 55 minutes. That rests on 362 flights, with a median arrival 13 minutes early.
Set against the rest of the country, UA 515's record is 10 points better than the US average of 77.3%. That gap is worth roughly 95 fewer late arrivals for every thousand flights.
Key figures
On time
86.8%
Arrivals under 15 minutes late, of 356 completed flights
Avg delay
55 min
Across delayed arrivals only, not all flights
Cancelled
1.38%
National rate is 1.89%
1 hour+ late
3.7%
National rate is 8.3%
These figures cover 362 flights between September 2025 and August 2026. The median arrival is 13 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 515 flies
UA 515 flies EWR to SAT without a single fixed slot. Its most common scheduled departure was 12:20, used on 75 of 362 flights, with 11:59 (50 flights) and 12:30 (44 flights) next.
- Departs 12:2075 flights20.7%
- Departs 11:5950 flights13.8%
- Departs 12:3044 flights12.2%
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 12:20 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 515 runs 9 points better at 86.8%. 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 515 next to EWR to SAT
Every carrier on EWR to SAT combined arrived on time 87.1% of the time across 596 flights, so UA 515 is about level with it. Across its whole network United Airlines managed 78.8%, which this flight beats by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 515thin sample | 362 | 86.8% | 55 min | 1.38% | A |
| All United Airlines on EWR–SAT | 596 | 87.1% | 51 min | 1.17% | A |
| All carriers on EWR–SAT | 596 | 87.1% | 51 min | 1.17% | A |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 515 quarter by quarter
UA 515 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Oct–Dec 2025 at 79.3%, a swing of 14 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.
- Jul–Sep 202530 flights93.3%
- Oct–Dec 202592 flights79.3%
- Jan–Mar 202687 flights92.8%
- Apr–Jun 202691 flights89.0%
- Jul–Sep 202662 flights83.3%
Scale runs 70% to 100%.
By weekday, UA 515 did best on Wednesday at 92.3% on time and worst on Saturday at 78.4%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 515 runs when it is late
UA 515 often beats the schedule: 174 of 356 completed flights, 49%, arrived 15 minutes or more early. The 47 late arrivals split 15 under half an hour, 19 between 30 and 60 minutes, and 13 an hour or more.
- 15+ min early174 flights48.9%
- Within 15 min135 flights37.9%
- 15–29 min late15 flights4.2%
- 30–59 min late19 flights5.3%
- 1–2 hours late9 flights2.5%
- 2+ hours late4 flights1.1%
Scale runs 0% to 100%.
Share of 356 completed flights by arrival against schedule.
A late pushback is often recovered here: of 51 departures that left 15 minutes late or more, 22 still arrived on time. In the other direction, 18 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 SAT.
The worst days
Worst days for UA 515
The latest arrival of the period was on 18 July 2026, 3 hours 19 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The five worst days are spread across July, June, October and April, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 July 2026 | 3 hours 19 minutes | National Airspace System |
| 28 June 2026 | 3 hours 2 minutes | Carrier |
| 4 July 2026 | 2 hours 52 minutes | Late-arriving aircraft |
| 30 October 2025 | 2 hours 23 minutes | National Airspace System |
| 6 April 2026 | 1 hour 52 minutes | Late-arriving aircraft |
Delay causes
Why UA 515 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 2,562 reported delay minutes.
- 38%National Airspace System
- 35%Carrier
- 22%Late-arriving aircraft
- 5%Extreme weather
The largest share of delay minutes, 35%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 895 of the 2,562 delay minutes reported here. The split is drawn from 2,562 delay minutes reported on UA 515.
Cancellations sit at 1.38% against a national 1.89%, which is ordinary. Diversions add another 0.28%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.7% 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 1,569 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 four other city pairs in the data, including SAT to IAH (133), SAT to DEN (55) and IAH to SEA (29), but none flew often enough under UA 515 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to EWR to SAT only.
One caution: this is a thin sample. 362 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 515
For a booking, UA 515 has one of the better records a US domestic flight can show: 86.8% on time and 1.38% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- Newark Liberty International (EWR) delay statistics
- San Antonio International (SAT) 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.