Las Vegas (LAS) to Houston (IAH): On-Time Performance
Data through May 2026
Las Vegas (LAS) to Houston (IAH) effectively runs on two schedules. In December 2025, 92% of arrivals were on time; in July 2024 that fell to 66% — a 26-point seasonal swing. Across the full period the route averages 83% on-time against a national 78%. Morning departures also hold up better than evening ones (87% vs 76%), which matters most in the rough months.
- On-time
- 83%
- arrived <15 min late
- Avg delay
- 13 min
- completed flights
- Cancelled
- 1.1%
- Flights/day
- 9.5
- last 12 months
- Duration
- 3h 5m
- scheduled
- Distance
- 1,222 mi
Best airline from LAS to IAH
4 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 86% | 11 min | 0.9% | 5,158 |
| Frontier Airlines | 78% | 14 min | 1.0% | 577 |
| Spirit Airlines | 76% | 18 min | 1.8% | 1,628 |
| Southwest Airlines | 70% | 16 min | 1.9% | 154 |
Monthly on-time trend
Best time to fly from LAS to IAH
Aim for departures around 7 a.m. (91% on-time); avoid 8 p.m. departures (63%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 79% | 15 min |
| Tuesday | 86% | 11 min |
| Wednesdaybest | 87% | 9 min |
| Thursday | 81% | 13 min |
| Friday | 81% | 15 min |
| Saturday | 85% | 11 min |
| Sunday | 81% | 15 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft37%
- Airline operations32%
- National airspace system29%
- Weather3%
Frequently asked questions
- How often are flights from LAS to IAH delayed?
- 17% of LAS–IAH flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 13 minutes.
- Which airline is most reliable from LAS to IAH?
- United Airlines has the best on-time record on this route at 86%, based on 5,158 flights. 4 airlines flew LAS–IAH frequently enough to compare in this period.
- What is the best time of day to fly from LAS to IAH?
- Departures around 7 a.m. have the best record (91% on-time), while departures around 8 p.m. have the worst (63%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from LAS to IAH?
- The scheduled LAS–IAH flight time averages 3h 5m over 1,222 miles. Actual arrival times vary — flights on this route land 15+ minutes late 17% of the time.
- How often are LAS to IAH flights cancelled?
- 1.1% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from LAS to IAH?
- July 2024 was the roughest month in this dataset, with only 66% of arrivals on time. The best was December 2025 at 92%. If your dates are flexible, that 26-point gap is worth planning around.
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Based on 7,517 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.