Best Time to Fly IAH to LAS: On-Time Stats by Hour & Airline
George Bush Intercontinental/Houston → Harry Reid International
Data through July 2026 · Last updated October 18, 2026
3,430 flights were scheduled from Houston (IAH) to Las Vegas (LAS) in the last 12 months, and 82.5% of those that flew arrived on time, 4.8 points above the US average of 77.6%.
Among 3 airlines, United Airlines led with 84.3% on time and Frontier Airlines was last with 69.5%.
Over 24 months, Wednesday was the most reliable day (87% on time) and June the worst month (72%).
The cancellation rate was 0.9% (US average 1.8%).
IAH 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 | 84.3% | 58 min | 0.3% | 2,595 |
| Spirit Airlines | 81.9% | 75 min | 2.4% | 466 |
| Frontier Airlines | 69.5% | 119 min | 3.0% | 369 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAH to LAS
On-time arrival % by scheduled departure hour (local time), 7,317 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | Limited data | 27 | |
| 6am–7am | 88.4% | 0.0% | 147 |
| 7am–8am | 92.2% | 0.5% | 759 |
| 8am–9am | 89.8% | 6.3% | 63 |
| 9am–10am | 87.6% | 0.6% | 881 |
| 10am–11am | 78.9% | 0.0% | 109 |
| 11am–12pm | 85.5% | 0.0% | 227 |
| 12pm–1pm | 85.6% | 0.9% | 575 |
| 1pm–2pm | 80.3% | 2.1% | 187 |
| 2pm–3pm | 82.1% | 0.1% | 914 |
| 3pm–4pm | 77.4% | 0.0% | 84 |
| 4pm–5pm | 80.9% | 0.5% | 636 |
| 5pm–6pm | 72.6% | 1.0% | 201 |
| 6pm–7pm | 77.5% | 0.7% | 760 |
| 7pm–8pm | 67.0% | 1.1% | 187 |
| 8pm–9pm | 72.0% | 1.4% | 809 |
| 9pm–10pm | 78.1% | 1.7% | 527 |
| 10pm–11pm | 79.4% | 2.2% | 223 |
| 11pm–12am | Limited data | 1 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on IAH 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) | 80.8% | -1.8 pts | 0.0% | 156 |
| Christmas & New Year (Dec 20 - Jan 3) | 82.4% | -0.1 pts | 0.3% | 297 |
| Summer peak (Jun 15 - Aug 15) | 76.6% | -5.9 pts | 1.3% | 1,148 |
| All other days | 82.5% | — | 0.8% | 5,716 |
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).