Flight number record
UA 430
United Airlines · Denver to Ontario
- Route
- DEN → ONT
- Departs
- 11:15
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 430, check with United Airlines.
UA 430 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 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 364 flights, with a median arrival 7 minutes early.
Set against the rest of the country, UA 430's record is 10 points better than the US average of 77.3%. That gap is worth roughly 103 fewer late arrivals for every thousand flights.
Key figures
On time
87.6%
Arrivals under 15 minutes late, of 364 completed flights
Avg delay
61 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
4.9%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. The median arrival is 7 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 430 flies
UA 430 flies DEN to ONT without a single fixed slot. Its most common scheduled departure was 11:15, used on 170 of 364 flights, with 11:25 (75 flights) next.
- Departs 11:15170 flights46.7%
- Departs 11:2575 flights20.6%
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 11:15 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 430 runs 9 points better at 87.6%. 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 430 next to DEN to ONT
Every carrier on DEN to ONT combined arrived on time 74.8% of the time across 2,623 flights, so UA 430 is 13 points ahead of it. United flew 797 flights on the same city pair under all its flight numbers, including this one, and those ran 79.4% 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 430thin sample | 364 | 87.6% | 61 min | 0.00% | A+ |
| All United Airlines on DEN–ONT | 797 | 79.4% | 68 min | 0.00% | B+ |
| All carriers on DEN–ONT | 2,623 | 74.8% | 57 min | 0.19% | C+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 430 quarter by quarter
Quarter by quarter UA 430 held fairly steady: 90.0% in Jul–Sep 2025, 87.0% in Oct–Dec 2025, 87.6% in Jan–Mar 2026, 85.7% in Apr–Jun 2026 and 90.3% in Jul–Sep 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights90.0%
- Oct–Dec 202592 flights87.0%
- Jan–Mar 202689 flights87.6%
- Apr–Jun 202691 flights85.7%
- Jul–Sep 202662 flights90.3%
Scale runs 75% to 95%.
By weekday, UA 430 ranged from 80.8% on Thursday to 92.5% on Monday. With about 52 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 430 runs when it is late
The 45 late arrivals split 19 under half an hour, 8 between 30 and 60 minutes, and 18 an hour or more.
- 15+ min early82 flights22.5%
- Within 15 min237 flights65.1%
- 15–29 min late19 flights5.2%
- 30–59 min late8 flights2.2%
- 1–2 hours late12 flights3.3%
- 2+ hours late6 flights1.6%
Scale runs 0% to 100%.
Share of 364 completed flights by arrival against schedule.
5 of 38 late departures made up the time and arrived on time, 13% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for UA 430
The latest arrival of the period was on 17 February 2026, 4 hours 29 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 February 2026 | 4 hours 29 minutes | Late-arriving aircraft |
| 21 August 2026 | 3 hours 4 minutes | Carrier |
| 3 December 2025 | 2 hours 15 minutes | Carrier |
| 1 December 2025 | 2 hours 14 minutes | Late-arriving aircraft |
| 2 April 2026 | 2 hours 12 minutes | Late-arriving aircraft |
Delay causes
Why UA 430 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 2,751 reported delay minutes.
- 39%Late-arriving aircraft
- 38%Carrier
- 23%National Airspace System
39% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,751 reported delay minutes here, that single category outweighs weather by 39 to one. The split is drawn from 2,751 delay minutes reported on UA 430.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are 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 4.9% 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.
The 819 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The same number turns up on one other city pair in the data, including JAX to IAH (1), but none flew often enough under UA 430 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to ONT only.
One caution: this is a thin sample. 364 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 430
For a booking, UA 430 has one of the better records a US domestic flight can show: 87.6% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- DEN to ONT, every carrier and departure
- ONT to DEN, the return direction
- Frontier Airlines 1261 on the same route76.9%
- Denver International (DEN) delay statistics
- Ontario International (ONT) 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.