Flight number record
UA 2108
United Airlines · Las Vegas to Denver
- Route
- LAS → DEN
- Departs
- 16:40
- Flights
- 308
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2108, check with United Airlines.
UA 2108 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 308 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.3%, so UA 2108 runs 7 points behind the country as a whole. Across a thousand flights that is about 72 extra late arrivals.
Key figures
On time
70.1%
Arrivals under 15 minutes late, of 308 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
11.7%
National rate is 8.3%
These figures cover 308 flights between September 2025 and August 2026. Beyond the headline rate, 11.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 2108 flies
UA 2108 flies LAS to DEN without a single fixed slot. Its most common scheduled departure was 16:40, used on 100 of 308 flights, with 16:25 (81 flights) and 16:35 (53 flights) next.
- Departs 16:40100 flights32.5%
- Departs 16:2581 flights26.3%
- Departs 16:3553 flights17.2%
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 16:40 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and UA 2108 runs level with that at 70.1%. 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 2108 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 2108 is 6 points behind 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 trails by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2108thin sample | 308 | 70.1% | 72 min | 0.00% | C+ |
| 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 2108 quarter by quarter
UA 2108 did not run the same all year. Its best quarter was Jan–Mar 2026 at 82.4% on time and its weakest Jul–Sep 2026 at 47.5%, a swing of 35 points on roughly 62 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 flights53.3%
- Oct–Dec 202541 flights73.2%
- Jan–Mar 202685 flights82.4%
- Apr–Jun 202691 flights78.0%
- Jul–Sep 202661 flights47.5%
Scale runs 40% to 90%.
By weekday, UA 2108 did best on Sunday at 79.1% on time and worst on Monday at 59.1%. Each day rests on about 44 flights, so a gap of 20 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 2108 runs when it is late
The 92 late arrivals split 33 under half an hour, 23 between 30 and 60 minutes, and 36 an hour or more.
- 15+ min early46 flights14.9%
- Within 15 min170 flights55.2%
- 15–29 min late33 flights10.7%
- 30–59 min late23 flights7.5%
- 1–2 hours late21 flights6.8%
- 2+ hours late15 flights4.9%
Scale runs 0% to 100%.
Share of 308 completed flights by arrival against schedule.
9 of 74 late departures made up the time and arrived on time, 12% of them. In the other direction, 27 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at DEN.
The worst days
Worst days for UA 2108
The latest arrival of the period was on 14 August 2026, 9 hours 7 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across August, October, May and January, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 August 2026 | 9 hours 7 minutes | Extreme weather |
| 10 October 2025 | 4 hours 25 minutes | Carrier |
| 3 August 2026 | 4 hours 23 minutes | National Airspace System |
| 18 May 2026 | 3 hours 57 minutes | Late-arriving aircraft |
| 26 January 2026 | 3 hours 31 minutes | Late-arriving aircraft |
Delay causes
Why UA 2108 runs late
National Airspace System accounts for 47% of the 6,655 delay minutes carriers reported here, and the remaining four split what is left.
- 47%National Airspace System
- 29%Late-arriving aircraft
- 15%Carrier
- 9%Extreme weather
47% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 3,122 minutes out of 6,655, against a national NAS share of 21%. The split is drawn from 6,655 delay minutes reported on UA 2108.
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
11.7% 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 DEN to DFW (84), DEN to GEG (19) and SEA to ORD (19), but none flew often enough under UA 2108 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. 308 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 2108
For a booking, UA 2108 is one of the weaker ways to fly LAS to DEN: 6 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- LAS to DEN, every carrier and departure
- DEN to LAS, the return direction
- United Airlines 596 on the same route97.8%
- Frontier Airlines 1994 on the same route77.4%
- Frontier Airlines 2350 on the same route88.4%
- 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
- How often a connection fails at the major US hubs
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.