Route Reliability

Route reliability

Las Vegas (LAS) to Houston (IAH): which airline is most on time?

On-time arrivals, cancellations and long delays for every airline that reported nonstop flights from Las Vegas, NV (LAS) to Houston, TX (IAH), September 2025 to August 2026.

Historical performance Official DOT data through August 2026 · Not live flight status

Las Vegas, NVHouston, TX

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Three-letter airport codes, nonstop U.S. domestic flights. One direction at a time.

Route at a glance · September 2025 to August 2026

LAS to IAH

Las Vegas, NV to Houston, TX

On time
83.2%vs 75.6% U.S. average Better than average
Cancelled
0.9%vs 1.9% U.S. average Better than average
60+ min late
5.6%vs 8.1% U.S. average Better than average
Scheduled flights
3,411in 12 months3 airlines
Most reliable airline
United Airlines85.2% on time · 2,596 flights

On time more often than the U.S. average, with fewer cancellations.

Compared with all U.S. flights, September 2025 to August 2026. “About average” means within 1.5 points for on time, 0.3 for cancelled and 1 for 60+ minutes late.

Airlines on this route

Ranked by on-time arrival

Airlines from LAS to IAH, September 2025 to August 2026. Rates are shares of all scheduled flights.
Airline On time Cancelled 60+ min late Avg delay when late Diverted Flights
1. United Airlines Most reliable 85.2% 0.3% 4.8% 74 min 0.4% 2,596
2. Spirit Airlines 77.6% 3.0% 8.6% 111 min 0.0% 406
3. Frontier Airlines 76.3% 2.0% 7.8% 66 min 0.2% 409

On time = arrived within 15 minutes of schedule. Avg delay when late = average arrival delay of flights 15+ minutes late. "Most reliable" needs at least 300 flights in 12 months. Tap a heading to sort.

What this means

United Airlines has the strongest record on this route.

  • United Airlines had the best on-time record from Las Vegas (LAS) to Houston (IAH): 85.2% of its 2,596 scheduled flights arrived within 15 minutes of schedule, compared with 76.3% for Frontier Airlines.
  • 0.9% of flights on this route were cancelled (about 1 in 111), 1.0 points lower than the U.S. average of 1.9%.
  • 5.6% of flights, about 1 in 18, arrived an hour or more late. When a flight was late (15+ minutes), the average arrival delay was 78 min.
  • Overall, 83.2% of flights on this route arrived on time, 7.6 points higher than the U.S. average of 75.6%.
  • Over the last 3 years, February was the most reliable month on this route (88.4% on time) and July the least reliable (70.7%).
  • Cancellations peaked in July, when 4.0% of flights were cancelled.
  • Flights scheduled to depart 6 am to 7 am were the most punctual (94.2% on time); flights scheduled to depart 2 pm to 3 pm were the least (67.9%).
  • In the other direction, Houston (IAH) to Las Vegas (LAS), 82.0% of flights were on time and 0.9% were cancelled. Compare airlines IAH to LAS.

Best and worst months to fly LAS to IAH

Jan 82.1%
Feb 88.4%
Mar 79.5%
Apr 84.3%
May 77.0%
Jun 74.5%
Jul 70.7%
Aug 77.6%
Sep 83.2%
Oct 86.3%
Nov 85.9%
Dec 87.0%
Share of scheduled flights on time 12-month average 83.2%
All airlines combined, by calendar month, September 2023 to August 2026 (3 years pooled). Scale starts at zero.
Show as table
PeriodOn timeFlights
January 82.1% 926
February 88.4% 896
March 79.5% 1,047
April 84.3% 974
May 77.0% 958
June 74.5% 909
July 70.7% 914
August 77.6% 870
September 83.2% 919
October 86.3% 1,062
November 85.9% 1,039
December 87.0% 995
Best and worst calendar month by airline, September 2023 to August 2026.
AirlineBest monthWorst month
United Airlines February (90.8%) July (75.7%)
Spirit Airlines February (84.7%) July (57.7%)
Frontier Airlines November (88.9%) June (62.0%)

Month by month, last 12 months

Sep 85.5%
Oct 87.3%
Nov 81.4%
Dec 91.6%
Jan 89.4%
Feb 89.0%
Mar 75.5%
Apr 80.9%
May 81.1%
Jun 78.5%
Jul 78.4%
Aug 79.5%
Share of scheduled flights on time U.S. average 75.6%
All airlines combined, September 2025 to August 2026. Scale starts at zero.
Show as table
PeriodOn timeFlights
Sep 2025 85.5% 255
Oct 2025 87.3% 292
Nov 2025 81.4% 312
Dec 2025 91.6% 309
Jan 2026 89.4% 282
Feb 2026 89.0% 292
Mar 2026 75.5% 323
Apr 2026 80.9% 293
May 2026 81.1% 264
Jun 2026 78.5% 261
Jul 2026 78.4% 264
Aug 2026 79.5% 264

Best and worst departure times

<6a 86.3%
6a 94.2%
7a 86.9%
8a 88.4%
9a 87.3%
10a 87.7%
11a 78.9%
12p 80.6%
1p 70.5%
2p 67.9%
3p 76.9%
4p 76.9%
5p Insufficient sample
6p 86.8%
7p Insufficient sample
11p Insufficient sample
Share of scheduled flights on time
By scheduled local departure hour at LAS, September 2025 to August 2026. Hours with no scheduled flights are omitted. Scale starts at zero.
Show as table
PeriodOn timeFlights
Departing before 6 am 86.3% 490
Departing 6 am to 7 am 94.2% 346
Departing 7 am to 8 am 86.9% 145
Departing 8 am to 9 am 88.4% 379
Departing 9 am to 10 am 87.3% 63
Departing 10 am to 11 am 87.7% 438
Departing 11 am to noon 78.9% 90
Departing noon to 1 pm 80.6% 372
Departing 1 pm to 2 pm 70.5% 156
Departing 2 pm to 3 pm 67.9% 234
Departing 3 pm to 4 pm 76.9% 363
Departing 4 pm to 5 pm 76.9% 134
Departing 5 pm to 6 pm Insufficient sample 25
Departing 6 pm to 7 pm 86.8% 129
Departing 7 pm to 8 pm Insufficient sample 2
Departing 11 pm to midnight Insufficient sample 45
Woman at an airport window watching a plane take off
Photo: Depositphotos (licensed stock, illustrative only). Credits

Sources & data dates

Source
U.S. DOT Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987-present)
Period
September 2025 to August 2026 (12 months); month-of-year patterns September 2023 to August 2026
Data through
August 2026
Processed
2026-11-03
Scope
Nonstop scheduled flights from Las Vegas, NV (LAS) to Houston, TX (IAH), one direction. Airlines that report to the DOT only.
Method
Rates use all scheduled flights as the denominator; cancelled and diverted flights count as not on time. Figures based on fewer than 50 scheduled flights are suppressed. Full methodology.

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