Flight number record
UA 1173
United Airlines · San Juan to Newark
- Route
- SJU → EWR
- Departs
- 13:25
- Flights
- 365
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1173, check with United Airlines.
UA 1173 draws a D−. Roughly 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 late.
The national on-time rate over the same period is 77.6%, so UA 1173 runs 15 points behind the country as a whole. Across a thousand flights that is about 147 extra late arrivals.
Key figures
On time
62.9%
Arrivals under 15 minutes late, of 348 completed flights
Avg delay
92 min
Across delayed arrivals only, not all flights
Cancelled
4.38%
National rate is 1.81%
1 hour+ late
14.9%
National rate is 8.1%
These figures cover 365 flights between July 2025 and June 2026. Beyond the headline rate, 14.9% 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 1173 flies
UA 1173 flies SJU to EWR without a single fixed slot. Its most common scheduled departure was 13:25, used on 188 of 365 flights, with 14:15 (55 flights) and 14:10 (38 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 13:25188 flights51.5%
- Departs 14:1555 flights15.1%
- Departs 14:1038 flights10.4%
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 13:25 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and UA 1173 runs 16 points worse at 62.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
UA 1173 next to SJU to EWR
Every carrier on SJU to EWR combined arrived on time 74.6% of the time across 2,100 flights, so UA 1173 is 12 points behind it. United flew 1,113 flights on the same city pair under all its flight numbers, including this one, and those ran 76.5% on time. Across its whole network United Airlines managed 79.0%, which this flight trails by 16 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1173 | 365 | 62.9% | 92 min | 4.38% | D− |
| All United Airlines on SJU–EWR | 1,113 | 76.5% | 90 min | 2.70% | B |
| All carriers on SJU–EWR | 2,100 | 74.6% | 83 min | 3.14% | C− |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 1173 quarter by quarter
UA 1173 did not run the same all year. Its best quarter was Apr–Jun 2026 at 71.9% on time and its weakest Jul–Sep 2025 at 51.1%, a swing of 21 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 202592 flights51.1%
- Oct–Dec 202592 flights60.2%
- Jan–Mar 202690 flights68.6%
- Apr–Jun 202691 flights71.9%
Scale runs 45% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1173 did best on Tuesday at 69.2% on time and worst on Sunday at 51.0%. Each day rests on about 52 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 1173 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 73% of the 12,000 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.
- 73%Late-arriving aircraft
- 16%National Airspace System
- 11%Carrier
73% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 12,000 reported delay minutes here, that single category outweighs weather by 73 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 11,889 delay minutes reported on UA 1173.
Cancellations run at 4.38%, against 1.81% nationally. That is roughly 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 14.9% 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 1,608 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.
Every one of the 365 flights under UA 1173 in the data flew SJU to EWR. The number was not reused on any other city pair, which makes this a clean record of one route.
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 1173
For a booking, the cancellation rate is the figure to plan around on UA 1173: 4.38% of its 365 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
- SJU to EWR, every carrier and departure
- EWR to SJU, the return direction
- United Airlines 2219 on the same route85.0%
- United Airlines 2036 on the same route80.6%
- Luis Munoz Marin International (SJU) delay statistics
- Newark Liberty International (EWR) 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.