Carrier performance at one airport
UA→LAS
United Airlines at Harry Reid International
- Departures
- 15,169
- Period
- September 2025 to August 2026
- Routes
- 7
- Rank here
- #6 of 11
United Airlines at Las Vegas lands a B+, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 15,169 flights, of which Spirit Airlines flew 5,509 at 85.0% on time.
Measured against the airport rather than the country, United Airlines runs 3 points ahead of the 76.9% weighted average across all carriers at LAS. That is the comparison worth making: every operator here works the same runways, the same airspace and the same weather.
Key figures
On time
79.5%
14,996 completed departures
Avg delay
71 min
Across delayed flights only
Cancelled
0.63%
At LAS, this carrier only
Rank here
#6
Of 11 carriers clearing the floor at LAS
These figures cover 15,000 flights between September 2025 and August 2026. The median arrival is 9 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.
Against the competition
Every carrier at LAS, ranked
The choice of carrier is not cosmetic here. Spirit Airlines arrives on time 85.0% of the time; Hawaiian Airlines manages 70.6%. Sample sizes sit next to every figure, because a two-point gap across 594 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Spirit Airlines | 5,509 | 85.0% | 87 min | 1.89% | A |
| Delta Air Lines | 15,583 | 84.4% | 79 min | 1.08% | B |
| Allegiant Air | 7,022 | 83.1% | 75 min | 0.43% | B+ |
| American Airlines | 14,079 | 80.5% | 98 min | 1.68% | B |
| SkyWest Airlines | 3,247 | 79.5% | 66 min | 0.95% | B+ |
| United Airlines (this page) | 15,169 | 79.5% | 71 min | 0.63% | B+ |
| Alaska Airlines | 7,098 | 78.7% | 60 min | 1.01% | B |
| JetBlue Airways | 4,040 | 77.5% | 83 min | 2.40% | B |
| Frontier Airlines | 13,095 | 75.4% | 79 min | 1.46% | B |
| Southwest Airlines | 86,407 | 73.4% | 50 min | 0.60% | C+ |
| Hawaiian Airlines | 594 | 70.6% | 101 min | 0.34% | C+ |
The spread between Spirit and Hawaiian is 14 points, wide enough that it should decide the booking. On a hundred trips that is 14 more arrivals inside the on-time window.
Route by route
Where United Airlines flies from LAS
United Airlines operates 7 routes out of LAS with enough volume to report. Route records inside one carrier at one airport still spread widely, because a short shuttle and a transcontinental have very different exposure to a late inbound.
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| LAS to SFO · San Francisco | 2,816 | 62.6% | 64 min | 0.43% | D+ |
| LAS to IAH · Houston | 2,596 | 85.8% | 74 min | 0.35% | A+ |
| LAS to EWR · Newark | 2,458 | 81.8% | 84 min | 1.63% | B |
| LAS to DEN · Denver | 2,398 | 83.8% | 74 min | 0.46% | B+ |
| LAS to ORD · Chicago | 2,354 | 78.2% | 76 min | 0.34% | B+ |
| LAS to LAX · Los Angeles | 1,576 | 85.6% | 59 min | 0.57% | A+ |
| LAS to IAD · Washington | 967 | 88.2% | 63 min | 0.62% | A+ |
Flight by flight
United Airlines flight numbers from LAS
13 United Airlines flight numbers leaving LAS flew their main route often enough to have a record of their own. Grouped by destination.
- UA 596to DEN 05:3097.8%
- UA 2108to DEN 16:4070.1%
- UA 2382to IAD 13:2380.8%
- UA 1181to IAH 08:0089.6%
- UA 2039to LAX 06:0096.4%
- UA 664to ORD 07:0086.2%
- UA 706to ORD 14:2565.0%
- UA 1583to ORD 10:2580.1%
- UA 2102to ORD 23:5990.7%
- UA 574to SFO 11:3066.1%
- UA 1267to SFO 19:5239.2%
- UA 2047to SFO 16:0567.7%
- UA 2356to SFO 07:4559.1%
Departure window
Best time of day for this operation
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 18 points, against 14 points between the best and worst carrier.
- 5am–8am2,589 flights89.4%
- 8am–11am2,973 flights86.9%
- 11am–2pm3,020 flights72.8%
- 2pm–5pm3,027 flights73.6%
- 5pm–8pm1,514 flights71.3%
- 8pm–5am2,046 flights80.7%
Scale runs 65% to 95%.
Book the early departure. Flights leaving between 5am–8am arrive on time 89.4% of the time, against 71.3% for the evening window. That is 18 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 3,027 flights scheduled in it.
Across the year
Seasonal pattern
August is the worst month at 67.0% on time, 21 points below February, the best at 87.5%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. March was the busiest month here, with 1,359 flights.
Delay causes
What holds this operation up
- 44%National Airspace System
- 34%Late-arriving aircraft
- 20%Carrier
- 1%Extreme weather
34% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 217,000 reported delay minutes here, that single category outweighs weather by 23 to one. The split is drawn from 217,350 reported delay minutes.
Cancellations are rare at 0.63%, 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.
7.5% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
15,169 flights sit behind these numbers, which is a large enough sample that the headline rate is not moving on noise. Where a sub-group falls below 30 flights the site shows a dash instead of a percentage.
Put together: the calendar is the biggest lever here, not the carrier or the hour. February runs 87.5% on time and August 67.0%, a swing of 21 points. If the dates move at all, move them out of August before you think about anything else. 14,996 completed flights over 12 months sit behind that.
Common questions
United Airlines at LAS
How often is United Airlines at LAS delayed?
About one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 20.5% of the 15,169 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on United Airlines at LAS?
Spirit Airlines leads at 85.0% on time across 5,509 flights. Hawaiian Airlines is at the other end on 70.6%, a gap of 14 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on United Airlines at LAS?
The 5am–8am departure window is the strongest at 89.4% on time. The 5pm–8pm window is the weakest at 71.3%, 18 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are August delays on United Airlines at LAS?
August is the weakest month at 67.0% on time, compared with 87.5% in February. Across the year that is 21 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- United Airlines network-wide record
- Harry Reid International (LAS) all carriers
- LAS to SFO route record62.6%
- LAS to IAH route record85.8%
- LAS to EWR route record81.8%
- LAS to DEN route record83.8%
- Denver, Salt Lake City, Phoenix and Las Vegas: the Mountain West hubs
- Why the first flight of the morning is statistically safest
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.