Flight number record
UA 655
United Airlines · Denver to Las Vegas
- Route
- DEN → LAS
- Departs
- 19:05
- Flights
- 363
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 655, check with United Airlines.
UA 655 draws a C+. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 363 flights, with a median arrival right on schedule.
The national on-time rate over the same period is 77.3%, so UA 655 runs 11 points behind the country as a whole. Across a thousand flights that is about 105 extra late arrivals.
Key figures
On time
66.8%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
0.28%
National rate is 1.89%
1 hour+ late
13.0%
National rate is 8.3%
These figures cover 363 flights between September 2025 and August 2026. Beyond the headline rate, 13.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 655 flies
UA 655 flies DEN to LAS without a single fixed slot. Its most common scheduled departure was 19:05, used on 81 of 363 flights, with 19:40 (69 flights) and 19:25 (68 flights) next.
- Departs 19:0581 flights22.3%
- Departs 19:4069 flights19.0%
- Departs 19:2568 flights18.7%
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 19:05 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and UA 655 runs level with that at 66.8%. 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 655 next to DEN to LAS
Every carrier on DEN to LAS combined arrived on time 75.5% of the time across 7,168 flights, so UA 655 is 9 points behind it. United flew 2,401 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 trails by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 655thin sample | 363 | 66.8% | 73 min | 0.28% | C+ |
| All United Airlines on DEN–LAS | 2,401 | 79.4% | 65 min | 0.33% | B+ |
| All carriers on DEN–LAS | 7,168 | 75.5% | 64 min | 0.64% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 655 quarter by quarter
UA 655 did not run the same all year. Its best quarter was Oct–Dec 2025 at 78.0% on time and its weakest Jul–Sep 2026 at 39.3%, a swing of 39 points on roughly 73 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.
- Jul–Sep 202530 flights70.0%
- Oct–Dec 202591 flights78.0%
- Jan–Mar 202690 flights77.8%
- Apr–Jun 202690 flights61.8%
- Jul–Sep 202662 flights39.3%
Scale runs 30% to 85%.
By weekday, UA 655 did best on Monday at 73.6% on time and worst on Thursday at 54.9%. Each day rests on about 52 flights, so a gap of 19 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 655 runs when it is late
The 120 late arrivals split 39 under half an hour, 34 between 30 and 60 minutes, and 47 an hour or more.
- 15+ min early76 flights21.1%
- Within 15 min165 flights45.7%
- 15–29 min late39 flights10.8%
- 30–59 min late34 flights9.4%
- 1–2 hours late24 flights6.6%
- 2+ hours late23 flights6.4%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
16 of 119 late departures made up the time and arrived on time, 13% of them. 17 flights left on time and still arrived late.
The worst days
Worst days for UA 655
The latest arrival of the period was on 3 August 2026, 5 hours 29 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 |
|---|---|---|
| 3 August 2026 | 5 hours 29 minutes | Late-arriving aircraft |
| 27 July 2026 | 4 hours 19 minutes | Carrier |
| 14 August 2026 | 4 hours 6 minutes | Late-arriving aircraft |
| 6 March 2026 | 4 hours 1 minute | Late-arriving aircraft |
| 18 June 2026 | 3 hours 53 minutes | Late-arriving aircraft |
Delay causes
Why UA 655 runs late
Late-arriving aircraft accounts for 54% of the 8,694 delay minutes carriers reported here, and the remaining four split what is left.
- 54%Late-arriving aircraft
- 25%Carrier
- 20%National Airspace System
- 0%Extreme weather
54% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 8,694 reported delay minutes here, that single category outweighs weather by 54 to one. The split is drawn from 8,694 delay minutes reported on UA 655.
Cancellations are rare at 0.28%, 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
13.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
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 four other city pairs in the data, including SEA to DEN (30), LAS to EWR (26) and LAS to ORD (23), but none flew often enough under UA 655 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to LAS only.
One caution: this is a thin sample. 363 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 655
For a booking, UA 655 is a flight to put a long connection behind. 13.0% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- DEN to LAS, every carrier and departure
- LAS to DEN, the return direction
- United Airlines 2316 on the same route94.2%
- Frontier Airlines 777 on the same route72.1%
- Frontier Airlines 1993 on the same route80.3%
- United Airlines 526 on the same route81.1%
- Frontier Airlines 2349 on the same route69.9%
- Frontier Airlines 2015 on the same route88.4%
- Denver International (DEN) delay statistics
- Harry Reid International (LAS) 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.