Flight number record
UA 1173
United Airlines · San Juan to Newark
- Route
- SJU → EWR
- Departs
- 13:25
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1173, check with United Airlines.
UA 1173 draws a D−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is close to two hours behind schedule. Build slack into anything you connect to. That rests on 365 flights, with a median arrival 2 minutes late.
The national on-time rate over the same period is 77.3%, so UA 1173 runs 13 points behind the country as a whole. Across a thousand flights that is about 131 extra late arrivals.
Key figures
On time
64.2%
Arrivals under 15 minutes late, of 344 completed flights
Avg delay
104 min
Across delayed arrivals only, not all flights
Cancelled
4.93%
National rate is 1.89%
1 hour+ late
16.3%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. Beyond the headline rate, 16.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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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.
- Departs 13:25188 flights51.5%
- Departs 14:1555 flights15.1%
- Departs 14:1038 flights10.4%
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 13:25 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 1173 runs 14 points worse at 64.2%. 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 1173 next to SJU to EWR
Every carrier on SJU to EWR combined arrived on time 74.6% of the time across 2,077 flights, so UA 1173 is 10 points behind it. United flew 1,113 flights on the same city pair under all its flight numbers, including this one, and those ran 77.4% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 15 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1173 | 365 | 64.2% | 104 min | 4.93% | D− |
| All United Airlines on SJU–EWR | 1,113 | 77.4% | 104 min | 2.79% | B |
| All carriers on SJU–EWR | 2,077 | 74.6% | 88 min | 3.27% | C− |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | 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 2026 at 54.4%, a swing of 18 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 202530 flights—
- Oct–Dec 202592 flights60.2%
- Jan–Mar 202690 flights68.6%
- Apr–Jun 202691 flights71.9%
- Jul–Sep 202662 flights54.4%
Scale runs 45% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1173 did best on Wednesday at 70.2% on time and worst on Sunday at 53.1%. Each day rests on about 52 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1173 runs when it is late
The 123 late arrivals split 40 under half an hour, 27 between 30 and 60 minutes, and 56 an hour or more.
- 15+ min early83 flights24.1%
- Within 15 min138 flights40.1%
- 15–29 min late40 flights11.6%
- 30–59 min late27 flights7.8%
- 1–2 hours late27 flights7.8%
- 2+ hours late29 flights8.4%
Scale runs 0% to 100%.
Share of 344 completed flights by arrival against schedule.
19 of 116 late departures made up the time and arrived on time, 16% of them. In the other direction, 26 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 EWR.
The worst days
Worst days for UA 1173
The latest arrival of the period was on 30 July 2026, 19 hours 28 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On four of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 July 2026 | 19 hours 28 minutes | Carrier |
| 16 March 2026 | 10 hours 15 minutes | Late-arriving aircraft |
| 21 February 2026 | 10 hours 10 minutes | Late-arriving aircraft |
| 24 March 2026 | 8 hours 4 minutes | Late-arriving aircraft |
| 20 May 2026 | 6 hours 52 minutes | Late-arriving aircraft |
Delay causes
Why UA 1173 runs late
Late-arriving aircraft accounts for 73% of the 13,000 delay minutes carriers reported here, and the remaining four split what is left.
- 73%Late-arriving aircraft
- 17%Carrier
- 10%National Airspace System
73% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 13,000 reported delay minutes here, that single category outweighs weather by 73 to one. The split is drawn from 12,833 delay minutes reported on UA 1173.
Cancellations run at 4.93%, against 1.89% nationally. That is about one flight in twenty 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
16.3% 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 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: 4.93% of its 365 scheduled flights did not operate. A late arrival costs close to two hours, 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 route83.3%
- United Airlines 2036 on the same route83.6%
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.