Flight number record
UA 515
United Airlines · Newark to San Antonio
- Route
- EWR → SAT
- Departs
- 12:30
- Flights
- 313
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 515, check with United Airlines.
UA 515 earns an A+. Close to nine flights in ten 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 77.6%. When something does go wrong the average delay runs roughly 50 minutes. That rests on 313 flights, with a median arrival 12 minutes early.
Set against the rest of the country, UA 515's record is 10 points better than the US average of 77.6%. That gap is worth roughly 98 fewer late arrivals for every thousand flights.
Key figures
On time
87.4%
Arrivals under 15 minutes late, of 309 completed flights
Avg delay
48 min
Across delayed arrivals only, not all flights
Cancelled
0.96%
National rate is 1.81%
1 hour+ late
3.2%
National rate is 8.1%
These figures cover 313 flights between July 2025 and June 2026. The median arrival is 12 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.
Schedule
When UA 515 flies
UA 515 flies EWR to SAT without a single fixed slot. Its most common scheduled departure was 12:30, used on 56 of 313 flights, with 12:20 (40 flights) and 11:15 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 12:3056 flights17.9%
- Departs 12:2040 flights12.8%
- Departs 11:1536 flights11.5%
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 12:30 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and UA 515 runs 9 points better at 87.4%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
UA 515 next to EWR to SAT
Every carrier on EWR to SAT combined arrived on time 86.5% of the time across 554 flights, so UA 515 is about level with it. United flew 552 flights on the same city pair under all its flight numbers, including this one, and those ran 86.6% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 515thin sample | 313 | 87.4% | 48 min | 0.96% | A+ |
| All United Airlines on EWR–SAT | 552 | 86.6% | 51 min | 0.91% | A+ |
| All carriers on EWR–SAT | 554 | 86.5% | 51 min | 0.90% | A+ |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 515 quarter by quarter
UA 515 did not run the same all year. Its best quarter was Jan–Mar 2026 at 92.8% on time and its weakest Oct–Dec 2025 at 79.3%, a swing of 14 points on roughly 78 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 202543 flights90.7%
- Oct–Dec 202592 flights79.3%
- Jan–Mar 202687 flights92.8%
- Apr–Jun 202691 flights89.0%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 515 ranged from 81.8% on Saturday to 93.3% on Tuesday. With about 45 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.
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 1,889 reported delay minutes.
- 39%Carrier
- 38%National Airspace System
- 22%Late-arriving aircraft
- 1%Extreme weather
The largest share of delay minutes, 39%, 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 736 of the 1,889 delay minutes reported here. The split is drawn from 1,889 delay minutes reported on UA 515.
Cancellations sit at 0.96% against a national 1.81%, which is ordinary. Diversions add another 0.32%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.2% land an hour or more behind schedule, against 8.1% 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 five other city pairs in the data, including SAT to IAH (133), SAT to DEN (68) and BOS to EWR (49), 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. 313 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: 87.4% on time and 0.96% 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.