LAS to IAH flight delays & on-time performance
Nonstop flights from Harry Reid International Airport to George Bush Intercontinental Airport · 1,222 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at LAS or IAH right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Las Vegas (LAS) to Houston (IAH) arrived on time 84% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.9% were cancelled, and 6% arrived an hour or more late.
- United Airlines was the most punctual airline here (86% on time); Spirit Airlines was the least (78%).
- Departures scheduled around 6am did best (95% on time); around 2pm did worst (70%).
- Wednesday was the most reliable day to fly (89% on time) and Friday the least (80%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (37%).
Which airline is most on time from LAS to IAH?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| United Airlines | 86% | 0.4% | 11 min | 4.7% | 2,594 |
| Frontier Airlines | 79% | 2.2% | 14 min | 7.8% | 368 |
| Spirit Airlines | 78% | 2.8% | 23 min | 8.8% | 470 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 12am91%451 flights
- 1am71%69 flights
- 6am95%347 flights
- 7am86%94 flights
- 8am89%401 flights
- 9am87%63 flights
- 10am88%452 flights
- 11am76%119 flights
- 12pm81%369 flights
- 1pm72%142 flights
- 2pm70%217 flights
- 3pm78%361 flights
- 4pm78%117 flights
- 6pm84%155 flights
- 11pm87%48 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday81%1.3% cancelled
- Tuesday85%0.5% cancelled
- Wednesday89%0.7% cancelled
- Thursday84%0.0% cancelled
- Friday80%1.3% cancelled
- Saturday86%0.4% cancelled
- Sunday83%1.9% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Airline (crew, maintenance, cleaning, fueling)37%
- Late-arriving aircraft35%
- Air traffic control & airport congestion26%
- Extreme weather2%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)61%
- Extreme weather39%
- Air traffic control & airport congestion0%
- Security0%
LAS to IAH: common questions
- How often are LAS to IAH flights on time?
- 84% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Las Vegas to Houston cancelled?
- 0.9% of scheduled flights were cancelled (31 of 3,432).
- How long are typical delays?
- Across all flights the average arrival delay was 13 min (early arrivals count as zero). Flights that were late arrived 77 min behind schedule on average, and 5.6% of flights were an hour or more late.
- How long is taxi time at LAS?
- Flights on this route spent 19 min taxiing from the gate to takeoff on average.
Related routes
Return trip: IAH to LAS — 82% on time
More flights from Las Vegas
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: LAS → IAH, nonstop flights by US airlines that report to the DOT. How we calculate this.