Route Reliability

Route reliability

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

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

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

Houston, TXLas Vegas, NV

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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

IAH to LAS

Houston, TX to Las Vegas, NV

On time
82.0%vs 75.6% U.S. average Better than average
Cancelled
0.9%vs 1.9% U.S. average Better than average
60+ min late
6.4%vs 8.1% U.S. average Better than average
Scheduled flights
3,409in 12 months3 airlines
Most reliable airline
United Airlines84.8% on time · 2,598 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 IAH to LAS, 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 84.8% 0.3% 5.2% 60 min 0.1% 2,598
2. Spirit Airlines 78.1% 2.5% 8.5% 75 min 0.2% 401
3. Frontier Airlines 68.0% 2.9% 11.5% 105 min 0.0% 410

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 Houston (IAH) to Las Vegas (LAS): 84.8% of its 2,598 scheduled flights arrived within 15 minutes of schedule, compared with 68.0% 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%.
  • 6.4% of flights, about 1 in 16, arrived an hour or more late. When a flight was late (15+ minutes), the average arrival delay was 71 min.
  • Overall, 82.0% of flights on this route arrived on time, 6.4 points higher than the U.S. average of 75.6%.
  • Over the last 3 years, February was the most reliable month on this route (87.0% on time) and July the least reliable (65.8%).
  • Cancellations peaked in January, when 3.6% of flights were cancelled.
  • Flights scheduled to depart 7 am to 8 am were the most punctual (93.0% on time); flights scheduled to depart 8 pm to 9 pm were the least (70.2%).
  • In the other direction, Las Vegas (LAS) to Houston (IAH), 83.2% of flights were on time and 0.9% were cancelled. Compare airlines LAS to IAH.

Best and worst months to fly IAH to LAS

Jan 78.0%
Feb 87.0%
Mar 79.8%
Apr 79.8%
May 72.2%
Jun 70.2%
Jul 65.8%
Aug 79.5%
Sep 80.1%
Oct 83.7%
Nov 83.5%
Dec 86.1%
Share of scheduled flights on time 12-month average 82.0%
All airlines combined, by calendar month, September 2023 to August 2026 (3 years pooled). Scale starts at zero.
Show as table
PeriodOn timeFlights
January 78.0% 924
February 87.0% 897
March 79.8% 1,034
April 79.8% 974
May 72.2% 957
June 70.2% 909
July 65.8% 918
August 79.5% 872
September 80.1% 916
October 83.7% 1,063
November 83.5% 1,039
December 86.1% 993
Best and worst calendar month by airline, September 2023 to August 2026.
AirlineBest monthWorst month
United Airlines February (89.5%) July (67.1%)
Spirit Airlines September (85.0%) July (61.7%)
Frontier Airlines November (81.0%) June (57.0%)

Month by month, last 12 months

Sep 82.7%
Oct 82.9%
Nov 79.4%
Dec 90.2%
Jan 87.2%
Feb 89.7%
Mar 82.7%
Apr 77.3%
May 81.4%
Jun 72.8%
Jul 73.9%
Aug 82.3%
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 82.7% 255
Oct 2025 82.9% 292
Nov 2025 79.4% 311
Dec 2025 90.2% 307
Jan 2026 87.2% 282
Feb 2026 89.7% 291
Mar 2026 82.7% 323
Apr 2026 77.3% 295
May 2026 81.4% 263
Jun 2026 72.8% 261
Jul 2026 73.9% 264
Aug 2026 82.3% 265

Best and worst departure times

6a Insufficient sample
7a 93.0%
8a Insufficient sample
9a 88.0%
10a 80.3%
11a 92.0%
12p 85.7%
1p 81.4%
2p 85.0%
3p 78.6%
4p 85.1%
5p 74.6%
6p 76.5%
7p 74.0%
8p 70.2%
9p 75.0%
10p Insufficient sample
Share of scheduled flights on time
By scheduled local departure hour at IAH, September 2025 to August 2026. Hours with no scheduled flights are omitted. Scale starts at zero.
Show as table
PeriodOn timeFlights
Departing 6 am to 7 am Insufficient sample 13
Departing 7 am to 8 am 93.0% 374
Departing 8 am to 9 am Insufficient sample 34
Departing 9 am to 10 am 88.0% 358
Departing 10 am to 11 am 80.3% 122
Departing 11 am to noon 92.0% 174
Departing noon to 1 pm 85.7% 203
Departing 1 pm to 2 pm 81.4% 167
Departing 2 pm to 3 pm 85.0% 367
Departing 3 pm to 4 pm 78.6% 56
Departing 4 pm to 5 pm 85.1% 323
Departing 5 pm to 6 pm 74.6% 114
Departing 6 pm to 7 pm 76.5% 349
Departing 7 pm to 8 pm 74.0% 50
Departing 8 pm to 9 pm 70.2% 426
Departing 9 pm to 10 pm 75.0% 232
Departing 10 pm to 11 pm Insufficient sample 47
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 Houston, TX (IAH) to Las Vegas, NV (LAS), 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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