Las Vegas (LAS) to Houston (IAH): On-Time Performance
Data through July 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
- 9.4
- last 12 months
- Duration
- 3h 6m
- scheduled
- Distance
- 1,222 mi
Best airline from LAS to IAH
4 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 86% | 11 min | 0.8% | 5,382 |
| Frontier Airlines | 78% | 14 min | 1.6% | 681 |
| Spirit Airlines | 76% | 18 min | 1.9% | 1,538 |
| Southwest Airlines | 66% | 21 min | 3.7% | 82 |
Monthly on-time trend
Best time to fly from LAS to IAH
Aim for departures around 6 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 | 88% | 9 min |
| Thursday | 81% | 14 min |
| Friday | 81% | 15 min |
| Saturday | 86% | 11 min |
| Sunday | 82% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft36%
- Airline operations33%
- 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 2024-07 and 2026-07. 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 5,382 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 6 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 6m 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 2024-07 and 2026-07, 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 7,683 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.