Flight number record
UA 2108
United Airlines · Las Vegas to Denver
- Route
- LAS → DEN
- Departs
- 16:40
- Flights
- 309
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 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 77.6%. The late ones land a little over an hour behind schedule. That rests on 309 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.6%, so UA 2108 runs 7 points behind the country as a whole. Across a thousand flights that is about 74 extra late arrivals.
Key figures
On time
70.2%
Arrivals under 15 minutes late, of 309 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.81%
1 hour+ late
12.3%
National rate is 8.1%
These figures cover 309 flights between July 2025 and June 2026. Beyond the headline rate, 12.3% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
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 113 of 309 flights, with 16:35 (53 flights) and 16:43 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 16:40113 flights36.6%
- Departs 16:3553 flights17.2%
- Departs 16:4349 flights15.9%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
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 72.4%, and UA 2108 runs 2 points worse at 70.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
UA 2108 next to LAS to DEN
Every carrier on LAS to DEN combined arrived on time 77.0% of the time across 7,088 flights, so UA 2108 is 7 points behind it. United flew 2,416 flights on the same city pair under all its flight numbers, including this one, and those ran 83.7% on time. Across its whole network United Airlines managed 79.0%, which this flight trails by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2108thin sample | 309 | 70.2% | 70 min | 0.00% | C+ |
| All United Airlines on LAS–DEN | 2,416 | 83.7% | 68 min | 0.50% | B+ |
| All carriers on LAS–DEN | 7,088 | 77.0% | 66 min | 0.87% | B+ |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | 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 2025 at 50.0%, a swing of 32 points on roughly 77 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 202592 flights50.0%
- Oct–Dec 202541 flights73.2%
- Jan–Mar 202685 flights82.4%
- Apr–Jun 202691 flights78.0%
Scale runs 40% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2108 did best on Sunday at 83.7% on time and worst on Thursday at 61.4%. Each day rests on about 44 flights, so a gap of 22 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 2108 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 6,448 reported delay minutes.
- 40%Late-arriving aircraft
- 40%National Airspace System
- 15%Carrier
- 5%Extreme weather
40% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 6,448 reported delay minutes here, that single category outweighs weather by 8 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 6,448 delay minutes reported on UA 2108.
Cancellations are rare at 0.00%, below the national 1.81% 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 12.3% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The same number turns up on four other city pairs in the data, including DEN to DFW (94), SEA to ORD (19) and DEN to GEG (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. 309 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 a flight to put a long connection behind. 12.3% 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
- LAS to DEN, every carrier and departure
- DEN to LAS, the return direction
- United Airlines 596 on the same route97.2%
- Frontier Airlines 1994 on the same route84.0%
- Frontier Airlines 4612 on the same route71.1%
- Frontier Airlines 2350 on the same route86.3%
- Frontier Airlines 3540 on the same route67.2%
- 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
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.