Flight number record
UA 2024
United Airlines · San Juan to Washington
- Route
- SJU → IAD
- Departs
- 16:55
- Flights
- 348
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2024, check with United Airlines.
UA 2024 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 11 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 55 minutes. That rests on 348 flights, with a median arrival 8 minutes early.
Set against the rest of the country, UA 2024's record is 11 points better than the US average of 77.3%. That gap is worth roughly 106 fewer late arrivals for every thousand flights.
Key figures
On time
87.9%
Arrivals under 15 minutes late, of 346 completed flights
Avg delay
55 min
Across delayed arrivals only, not all flights
Cancelled
0.57%
National rate is 1.89%
1 hour+ late
2.9%
National rate is 8.3%
These figures cover 348 flights between September 2025 and August 2026. The median arrival is 8 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 2024 flies
UA 2024 flies SJU to IAD without a single fixed slot. Its most common scheduled departure was 16:55, used on 194 of 348 flights, with 17:50 (126 flights) next.
- Departs 16:55194 flights55.7%
- Departs 17:50126 flights36.2%
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 16:55 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and UA 2024 runs 16 points better at 87.9%. 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 2024 next to SJU to IAD
Every carrier on SJU to IAD combined arrived on time 88.7% of the time across 698 flights, so UA 2024 is about level with it. United flew 636 flights on the same city pair under all its flight numbers, including this one, and those ran 91.6% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2024thin sample | 348 | 87.9% | 55 min | 0.57% | A+ |
| All United Airlines on SJU–IAD | 636 | 91.6% | 53 min | 0.63% | A+ |
| All carriers on SJU–IAD | 698 | 88.7% | 70 min | 0.72% | A+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2024 quarter by quarter
Quarter by quarter UA 2024 held fairly steady: 87.0% in Oct–Dec 2025, 86.4% in Jan–Mar 2026, 85.7% in Apr–Jun 2026 and 91.9% in Jul–Sep 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202513 flights—
- Oct–Dec 202592 flights87.0%
- Jan–Mar 202690 flights86.4%
- Apr–Jun 202691 flights85.7%
- Jul–Sep 202662 flights91.9%
Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2024 ranged from 82.4% on Saturday to 93.8% on Tuesday. With about 50 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 2024 runs when it is late
UA 2024 often beats the schedule: 113 of 346 completed flights, 33%, arrived 15 minutes or more early. The 42 late arrivals split 18 under half an hour, 14 between 30 and 60 minutes, and 10 an hour or more.
- 15+ min early113 flights32.7%
- Within 15 min191 flights55.2%
- 15–29 min late18 flights5.2%
- 30–59 min late14 flights4.0%
- 1–2 hours late6 flights1.7%
- 2+ hours late4 flights1.2%
Scale runs 0% to 100%.
Share of 346 completed flights by arrival against schedule.
A late pushback is often recovered here: of 51 departures that left 15 minutes late or more, 18 still arrived on time. 9 flights left on time and still arrived late.
The worst days
Worst days for UA 2024
The latest arrival of the period was on 21 March 2026, 4 hours 22 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 March 2026 | 4 hours 22 minutes | Late-arriving aircraft |
| 28 January 2026 | 4 hours 2 minutes | Late-arriving aircraft |
| 4 December 2025 | 3 hours 51 minutes | Late-arriving aircraft |
| 16 December 2025 | 2 hours 29 minutes | Late-arriving aircraft |
| 11 June 2026 | 1 hour 31 minutes | National Airspace System |
Delay causes
Why UA 2024 runs late
Late-arriving aircraft accounts for 66% of the 2,307 delay minutes carriers reported here, and the remaining four split what is left.
- 66%Late-arriving aircraft
- 19%National Airspace System
- 15%Carrier
66% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,307 reported delay minutes here, that single category outweighs weather by 66 to one. The split is drawn from 2,307 delay minutes reported on UA 2024.
Cancellations are rare at 0.57%, 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
Badly late arrivals are rare here: only 2.9% 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 1,572 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.
Every one of the 348 flights under UA 2024 in the data flew SJU to IAD. 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. 348 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 2024
For a booking, UA 2024 has one of the better records a US domestic flight can show: 87.9% on time and 0.57% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- Luis Munoz Marin International (SJU) delay statistics
- Washington Dulles International (IAD) 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.