Flight number record
UA 2025
United Airlines · Washington to San Juan
- Route
- IAD → SJU
- Departs
- 17:32
- Flights
- 289
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2025, check with United Airlines.
UA 2025 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 289 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.3%, so UA 2025 runs 7 points behind the country as a whole. Across a thousand flights that is about 69 extra late arrivals.
Key figures
On time
70.4%
Arrivals under 15 minutes late, of 287 completed flights
Avg delay
56 min
Across delayed arrivals only, not all flights
Cancelled
0.35%
National rate is 1.89%
1 hour+ late
7.7%
National rate is 8.3%
These figures cover 289 flights between September 2025 and August 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.
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Schedule
When UA 2025 flies
UA 2025 flies IAD to SJU without a single fixed slot. Its most common scheduled departure was 17:32, used on 154 of 289 flights, with 17:24 (135 flights) next.
- Departs 17:32154 flights53.3%
- Departs 17:24135 flights46.7%
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 17:32 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and UA 2025 runs 2 points better at 70.4%. 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 2025 next to IAD to SJU
Every carrier on IAD to SJU combined arrived on time 75.9% of the time across 698 flights, so UA 2025 is 6 points behind it. United flew 636 flights on the same city pair under all its flight numbers, including this one, and those ran 78.3% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2025thin sample | 289 | 70.4% | 56 min | 0.35% | C+ |
| All United Airlines on IAD–SJU | 636 | 78.3% | 54 min | 0.47% | B+ |
| All carriers on IAD–SJU | 698 | 75.9% | 77 min | 0.57% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2025 quarter by quarter
UA 2025 did not run the same all year. Its best quarter was Apr–Jun 2026 at 85.7% on time and its weakest Jul–Sep 2026 at 53.7%, a swing of 32 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.
- Oct–Dec 202567 flights58.2%
- Jan–Mar 202690 flights71.6%
- Apr–Jun 202691 flights85.7%
- Jul–Sep 202641 flights53.7%
Scale runs 45% to 90%.
By weekday, UA 2025 did best on Wednesday at 82.9% on time and worst on Saturday at 61.0%. Each day rests on about 41 flights, so a gap of 22 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 2025 runs when it is late
The 85 late arrivals split 31 under half an hour, 32 between 30 and 60 minutes, and 22 an hour or more.
- 15+ min early63 flights22.0%
- Within 15 min139 flights48.4%
- 15–29 min late31 flights10.8%
- 30–59 min late32 flights11.1%
- 1–2 hours late12 flights4.2%
- 2+ hours late10 flights3.5%
Scale runs 0% to 100%.
Share of 287 completed flights by arrival against schedule.
12 of 62 late departures made up the time and arrived on time, 19% of them. In the other direction, 35 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 SJU.
The worst days
Worst days for UA 2025
The latest arrival of the period was on 21 July 2026, 5 hours 15 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in July 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 July 2026 | 5 hours 15 minutes | Carrier |
| 3 January 2026 | 3 hours 55 minutes | National Airspace System |
| 28 July 2026 | 2 hours 55 minutes | National Airspace System |
| 4 July 2026 | 2 hours 45 minutes | Extreme weather |
| 7 August 2026 | 2 hours 35 minutes | National Airspace System |
Delay causes
Why UA 2025 runs late
National Airspace System accounts for 52% of the 4,747 delay minutes carriers reported here, and the remaining four split what is left.
- 52%National Airspace System
- 31%Carrier
- 9%Late-arriving aircraft
- 8%Extreme weather
52% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 2,488 minutes out of 4,747, against a national NAS share of 21%. The split is drawn from 4,747 delay minutes reported on UA 2025.
Cancellations are rare at 0.35%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
7.7% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
At 1,572 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 six other city pairs in the data, including DFW to DEN (31), SFO to DEN (24) and PDX to SFO (18), but none flew often enough under UA 2025 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAD to SJU only.
One caution: this is a thin sample. 289 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 2025
For a booking, UA 2025 is one of the weaker ways to fly IAD to SJU: 6 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- Washington Dulles International (IAD) delay statistics
- Luis Munoz Marin International (SJU) 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.