Best Time to Fly DEN to LAS: On-Time Stats by Hour & Airline
Denver International → Harry Reid International
Data through July 2026 · Last updated October 18, 2026
7,133 flights were scheduled from Denver (DEN) to Las Vegas (LAS) in the last 12 months, and 75.7% of those that flew arrived on time, 1.9 points below the US average of 77.6%.
United Airlines was the most punctual of the 3 airlines on the route at 79.6%, while Southwest Airlines trailed at 72.4%.
December has been the best month (81% on time) and Thursday the weakest day of the week (70%).
0.6% of flights were cancelled, versus 1.8% nationally.
DEN to LAS on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| United Airlines | 79.6% | 63 min | 0.3% | 2,392 |
| Frontier Airlines | 76.4% | 76 min | 0.9% | 1,598 |
| Southwest Airlines | 72.4% | 56 min | 0.7% | 3,143 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly DEN to LAS
On-time arrival % by scheduled departure hour (local time), 14,694 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 2 | |
| 5am–6am | 98.0% | 0.0% | 195 |
| 6am–7am | 94.7% | 0.4% | 721 |
| 7am–8am | 90.7% | 0.2% | 1,196 |
| 8am–9am | 90.9% | 0.0% | 659 |
| 9am–10am | 82.1% | 0.1% | 1,045 |
| 10am–11am | 82.5% | 0.4% | 708 |
| 11am–12pm | 80.4% | 0.4% | 1,081 |
| 12pm–1pm | 76.4% | 0.4% | 510 |
| 1pm–2pm | 74.9% | 0.3% | 1,152 |
| 2pm–3pm | 71.0% | 0.7% | 561 |
| 3pm–4pm | 71.7% | 0.5% | 590 |
| 4pm–5pm | 70.4% | 0.6% | 1,116 |
| 5pm–6pm | 64.1% | 0.3% | 993 |
| 6pm–7pm | 68.8% | 1.3% | 543 |
| 7pm–8pm | 64.3% | 0.9% | 1,380 |
| 8pm–9pm | 65.0% | 0.9% | 854 |
| 9pm–10pm | 60.8% | 1.6% | 581 |
| 10pm–11pm | 73.0% | 0.5% | 804 |
| 11pm–12am | Limited data | 3 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on DEN to LAS
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 80.1% | +2.4 pts | 0.0% | 266 |
| Christmas & New Year (Dec 20 - Jan 3) | 71.1% | -6.6 pts | 0.6% | 522 |
| Summer peak (Jun 15 - Aug 15) | 66.4% | -11.3 pts | 0.8% | 2,310 |
| All other days | 77.7% | — | 0.5% | 11,596 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).