Flight number record
UA 1930
United Airlines · Washington to San Diego
- Route
- IAD → SAN
- Departs
- 09:00
- Flights
- 335
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1930, check with United Airlines.
UA 1930 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 17 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 335 flights, with a median arrival 16 minutes early.
Set against the rest of the country, UA 1930's record is 17 points better than the US average of 77.3%. That gap is worth roughly 166 fewer late arrivals for every thousand flights.
Key figures
On time
93.9%
Arrivals under 15 minutes late, of 329 completed flights
Avg delay
57 min
Across delayed arrivals only, not all flights
Cancelled
0.90%
National rate is 1.89%
1 hour+ late
2.1%
National rate is 8.3%
These figures cover 335 flights between September 2025 and August 2026. The median arrival is 16 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 1930 flies
UA 1930 flies IAD to SAN without a single fixed slot. Its most common scheduled departure was 09:00, used on 175 of 335 flights, with 08:26 (46 flights) and 08:31 (43 flights) next.
- Departs 09:00175 flights52.2%
- Departs 08:2646 flights13.7%
- Departs 08:3143 flights12.8%
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 09:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 1930 runs 10 points better at 93.9%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
UA 1930 next to IAD to SAN
Every carrier on IAD to SAN combined arrived on time 82.9% of the time across 1,402 flights, so UA 1930 is 11 points ahead of it. United flew 1,041 flights on the same city pair under all its flight numbers, including this one, and those ran 86.1% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 15 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1930thin sample | 335 | 93.9% | 57 min | 0.90% | A+ |
| All United Airlines on IAD–SAN | 1,041 | 86.1% | 65 min | 0.67% | A+ |
| All carriers on IAD–SAN | 1,402 | 82.9% | 58 min | 0.71% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1930 quarter by quarter
Quarter by quarter UA 1930 held fairly steady: 94.4% in Oct–Dec 2025, 95.6% in Jan–Mar 2026, 90.1% in Apr–Jun 2026 and 95.1% 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 202530 flights—
- Oct–Dec 202591 flights94.4%
- Jan–Mar 202671 flights95.6%
- Apr–Jun 202681 flights90.1%
- Jul–Sep 202662 flights95.1%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1930 ranged from 88.2% on Saturday to 98.0% on Thursday. With about 48 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 1930 runs when it is late
UA 1930 often beats the schedule: 177 of 329 completed flights, 54%, arrived 15 minutes or more early. The 20 late arrivals split 9 under half an hour, 4 between 30 and 60 minutes, and 7 an hour or more.
- 15+ min early177 flights53.8%
- Within 15 min132 flights40.1%
- 15–29 min late9 flights2.7%
- 30–59 min late4 flights1.2%
- 1–2 hours late4 flights1.2%
- 2+ hours late3 flights0.9%
Scale runs 0% to 100%.
Share of 329 completed flights by arrival against schedule.
A late pushback is often recovered here: of 20 departures that left 15 minutes late or more, 10 still arrived on time. 10 flights left on time and still arrived late.
The worst days
Worst days for UA 1930
The latest arrival of the period was on 23 May 2026, 2 hours 26 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across May, July and December, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 23 May 2026 | 2 hours 26 minutes | Carrier |
| 30 May 2026 | 2 hours 5 minutes | Carrier |
| 18 July 2026 | 2 hours 4 minutes | Extreme weather |
| 5 December 2025 | 1 hour 48 minutes | Extreme weather |
| 22 July 2026 | 1 hour 48 minutes | National Airspace System |
Delay causes
Why UA 1930 runs late
Carrier accounts for 45% of the 1,140 delay minutes carriers reported here, and the remaining four split what is left.
- 45%Carrier
- 34%National Airspace System
- 16%Extreme weather
- 4%Late-arriving aircraft
Extreme weather accounts for 16% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.7 times the usual weather exposure. The split is drawn from 1,140 delay minutes reported on UA 1930.
Cancellations sit at 0.90% against a national 1.89%, which is ordinary. Diversions add another 0.90%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.1% 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 2,253 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 335 flights under UA 1930 in the data flew IAD to SAN. 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. 335 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 1930
For a booking, UA 1930 has one of the better records a US domestic flight can show: 93.9% on time and 0.90% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- IAD to SAN, every carrier and departure
- SAN to IAD, the return direction
- United Airlines 2054 on the same route80.7%
- United Airlines 2163 on the same route82.8%
- Washington Dulles International (IAD) delay statistics
- San Diego International (SAN) 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.