Flight number record
UA 596
United Airlines · Las Vegas to Denver
- Route
- LAS → DEN
- Departs
- 05:30
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 596, check with United Airlines.
UA 596 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 21 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 45 minutes. That rests on 365 flights, with a median arrival 19 minutes early.
Set against the rest of the country, UA 596's record is 21 points better than the US average of 77.3%. That gap is worth roughly 205 fewer late arrivals for every thousand flights.
Key figures
On time
97.8%
Arrivals under 15 minutes late, of 363 completed flights
Avg delay
46 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
0.6%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 19 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 596 flies
UA 596 flies LAS to DEN without a single fixed slot. Its most common scheduled departure was 05:30, used on 122 of 365 flights, with 05:20 (113 flights) and 06:00 (55 flights) next.
- Departs 05:30122 flights33.4%
- Departs 05:20113 flights31.0%
- Departs 06:0055 flights15.1%
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 05:30 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and UA 596 runs 9 points better at 97.8%. 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 596 next to LAS to DEN
Every carrier on LAS to DEN combined arrived on time 76.5% of the time across 7,140 flights, so UA 596 is 21 points ahead of it. United flew 2,398 flights on the same city pair under all its flight numbers, including this one, and those ran 83.8% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 19 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 596 | 365 | 97.8% | 46 min | 0.00% | A+ |
| All United Airlines on LAS–DEN | 2,398 | 83.8% | 74 min | 0.46% | B+ |
| All carriers on LAS–DEN | 7,140 | 76.5% | 69 min | 0.83% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 596 quarter by quarter
Quarter by quarter UA 596 held fairly steady: 100.0% in Jul–Sep 2025, 96.7% in Oct–Dec 2025, 96.6% in Jan–Mar 2026, 100.0% in Apr–Jun 2026 and 96.8% in Jul–Sep 2026. A spread of 3 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights100.0%
- Oct–Dec 202592 flights96.7%
- Jan–Mar 202690 flights96.6%
- Apr–Jun 202691 flights100.0%
- Jul–Sep 202662 flights96.8%
Scale runs 90% to 100%.
By weekday, UA 596 ranged from 94.2% on Saturday to 100.0% on Friday. With about 52 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 596 runs when it is late
UA 596 often beats the schedule: 255 of 363 completed flights, 70%, arrived 15 minutes or more early. Most of the lateness is short. 4 of the 8 late arrivals were under half an hour behind, and 2 reached an hour or more. Not one arrived two hours late.
- 15+ min early255 flights70.2%
- Within 15 min100 flights27.5%
- 15–29 min late4 flights1.1%
- 30–59 min late2 flights0.6%
- 1–2 hours late2 flights0.6%
- 2+ hours late0 flights0.0%
Scale runs 0% to 100%.
Share of 363 completed flights by arrival against schedule.
Only 7 of 363 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for UA 596
The latest arrival of the period was on 17 January 2026, 1 hour 45 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 January 2026 | 1 hour 45 minutes | Carrier |
| 16 October 2025 | 1 hour 32 minutes | National Airspace System |
| 7 March 2026 | 41 minutes | Carrier |
| 11 November 2025 | 33 minutes | Carrier |
| 18 August 2026 | 29 minutes | Carrier |
Delay causes
Why UA 596 runs late
Carrier accounts for 64% of the 365 delay minutes carriers reported here, and the remaining four split what is left.
- 64%Carrier
- 36%National Airspace System
The largest share of delay minutes, 64%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 235 of the 365 delay minutes reported here. The split is drawn from 365 delay minutes reported on UA 596.
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 0.6% 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 628 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 six other city pairs in the data, including DEN to DSM (50), DEN to DTW (32) and DEN to SAV (31), but none flew often enough under UA 596 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to LAS to DEN only.
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 596
For a booking, UA 596 has one of the better records a US domestic flight can show: 97.8% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- LAS to DEN, every carrier and departure
- DEN to LAS, the return direction
- Frontier Airlines 1994 on the same route77.4%
- Frontier Airlines 2350 on the same route88.4%
- United Airlines 2108 on the same route70.1%
- Frontier Airlines 4612 on the same route72.3%
- Frontier Airlines 3540 on the same route63.0%
- Harry Reid International (LAS) delay statistics
- Denver International (DEN) 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
- Late aircraft, weather, or the airline: what actually causes US flight delays
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.