Route profile
LAS→IAH
Flight reliability, delays and best times to fly from Las Vegas to Houston, 1,222 miles.
Right now
Aviation weather is not currently a factor.
Aviation weather is not currently a factor.
Route reliability
July 2023 – July 2026
Better than 70% of comparable major US routes (4,598 compared)
Calculated from 11,912 flights. How this is calculated
LAS → IAH arrives on time 82.5% of the time; the return trip, IAH → LAS, arrives on time 79.8% of the time, a 2.6-point gap between the two directions of the same city pair.
LAS → IAH spends 29.0 minutes on the ground on a 1,222-mile trip: 18.5 minutes from pushback to wheels-up at LAS and 10.5 minutes from touchdown to gate at IAH.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
This route has stayed remarkably steady year over year, a smaller swing than 95% of 5,368 comparable routes.
84.0% on time over the most recent 12 months (2025-08 to 2026-07), against 83.7% in the 12 months before (2024-08 to 2025-07), virtually unchanged.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Ranked against every other route with the same kind of figure and at least 5,368 in the comparison.
Why LAS → IAH flights are cancelled
July 2023 – July 2026
LAS → IAH cancelled 131 of 11,912 scheduled flights — about 1 in every 91. The reason filed most often was extreme weather, 49.6% of the cancellations coded on this route — about 1 in every 183 scheduled flights.
Share of cancellations
Of 131 cancelled departures carrying a reason code.
What each reason means
Conditions the carrier judged severe enough to stop the flight: a blizzard, a hurricane, a line of thunderstorms.
65 cancellations, 49.6% of the total.
Crew, maintenance, aircraft cleaning, baggage or fueling: what BTS counts as within the carrier’s own control.
56 cancellations, 42.7% of the total.
Airport capacity, air traffic control flow programs, heavy traffic and ordinary bad weather. A system decision, not the airline’s.
10 cancellations, 7.6% of the total.
A terminal evacuation, a security breach, screening equipment failure, or screening queues over 29 minutes.
0 cancellations, 0.0% of the total.
Reason codes are the operating airline’s own filing with US DOT, not an independent finding of fault. Ordinary bad weather is filed under air traffic, so weather’s full share is larger than its bar.
131 coded cancellations were recorded on LAS → IAH; the section appears from 50.
When it goes wrong
July 2023 – July 2026
34 min late
against a median of 8 min early
Percentiles over 11,912 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at IAH after arriving from LAS.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 31% | Likely to miss |
| 45 min | 17% | High risk |
| 60 min | 11% | Some risk |
| 90 min | 5.8% | Some risk |
| 120 min | 3.8% | Low risk |
This is one leg of a connection. Gate changes and the next flight's own schedule matter too. And a connection can fail before delay is even the question — this route cancels 1.10% of the time and diverts 0.39% of the time, which a late arrival never shows up in.
Chance of missing is the share of 11,735 arrivals on this route that landed later than the connection time less 30 minutes to reach the next gate.
The worst tenth of arrivals on this route land at least 34 minutes late (90th-percentile gate arrival delay), over 11,912 operations.
Any other layover length: connection checker.
Best time to fly
LAS → IAH flights departing 5–9 AM arrived on time 90.6% of the time, against 74.0% for 6–9 PM departures, a gap of 16.6 percentage points.
By departure window
By departure hour
- 12 AM: 90.5% on time from 1,238 flights
- 1 AM to 5 AM: too few flights to score
- 6 AM: 92.4% on time from 1,453 flights
- 7 AM: 86.6% on time from 160 flights
- 8 AM: 88.9% on time from 1,008 flights
- 9 AM: 82.4% on time from 344 flights
- 10 AM: 87.5% on time from 1,290 flights
- 11 AM: 75.9% on time from 272 flights
- 12 PM: 78.4% on time from 1,398 flights
- 1 PM: 76.6% on time from 564 flights
- 2 PM: 74.3% on time from 521 flights
- 3 PM: 76.3% on time from 1,134 flights
- 4 PM: 75.0% on time from 330 flights
- 5 PM: 76.4% on time from 670 flights
- 6 PM: 76.7% on time from 627 flights
- 7 PM: 70.8% on time from 298 flights
- 8 PM to 10 PM: too few flights to score
- 11 PM: 80.7% on time from 402 flights
Why LAS → IAH runs late
July 2023 – July 2026
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for LAS → IAH. Only delays of 15 minutes or more are attributed.
Late-arriving aircraft is the largest cause on LAS → IAH, at 39.5%: flights here mostly leave late because the plane came in late, and the day shows it: 5–9 AM departures arrived on time 90.6% of the time and 6–9 PM departures 74.0%.
How this route holds up in bad weather
July 2023 – July 2026
Bad weather raises cancellations by a similar amount at both ends of LAS to IAH: 2.4 times the normal rate at LAS and 3.4 times at IAH. Cancelled in bad weather against normal hours: LAS 2.0% against 0.8%, IAH 4.1% against 1.2%. Flights that did leave LAS in bad weather arrived on time 58.5% of the time, against 78.5% in normal hours.
Bad weather and normal hours at the airports
Scheduled departures, July 2023 – July 2026| Departures from | LAS | IAH |
|---|---|---|
| Cancelled in bad weather | 2.0% | 4.1% |
| Cancelled in normal hours | 0.8% | 1.2% |
| Arrived on time, bad weather | 58.5% | 63.8% |
| Arrived on time, normal hours | 78.5% | 78.6% |
| Departures in bad weather | 14,522 | 28,922 |
Of the carriers on this route, United Airlines (1.0% cancelled against 2.0% for the other carriers at LAS) cancelled the fewest departures from LAS in bad weather and Frontier Airlines (4.0% cancelled against 1.8% for the other carriers at LAS) the most.
This route’s airlines in bad weather at LAS
All departures from LAS| Airline | Bad-weather departures | Cancelled | Other carriers |
|---|---|---|---|
| United Airlines | 1,215 | 1.0%below the others | 2.0% |
| Southwest Airlines | 6,925 | 2.0%about level | 2.1% |
| Spirit Airlines | 1,398 | 3.8%above the others | 2.3% |
| Frontier Airlines | 943 | 4.0%above the others | 1.8% |
These are airport figures, not route figures: every scheduled departure from LAS and IAH, to any destination, in hours the weather report called bad. The airline rows count each carrier’s departures from LAS on every route.
Weather source and limits. In full: LAS (airlines), IAH, What Weather Costs Each Airport, Who Cancels More When the Weather Turns, Airports That Change Places When Weather Turns.
Airlines on this route
Carriers with at least 200 flights, by the airline that operated each one.
| Carrier | Flights | On time | Cancelled | Median delay | Severe |
|---|---|---|---|---|---|
| United Airlines | 7,546 | 86.2% | 0.95% | -10 min | 4.8% |
| Spirit Airlines | 2,495 | 75.9% | 1.52% | -5 min | 7.8% |
| Southwest Airlines | 949 | 75.0% | 0.74% | -2 min | 6.8% |
| Frontier Airlines | 922 | 77.1% | 1.52% | -6 min | 8.0% |
United Airlines flew 63.3% of the 11,912 flights listed.
United Airlines arrived on time 11.2 percentage points more often than Southwest Airlines on this route.
Flights on this route
Flight numbers with at least 600 operations here and still on the schedule.
| Flight | Scheduled | Operations | On time |
|---|---|---|---|
| UA2608 United Airlines | 6:00 AM | 861 | 96.0% |
Weekly and seasonal patterns
By day of week
Wednesday is historically the most reliable day and Sunday the least, a gap of 8.5 percentage points.
By month
- Jan: 85.6%
- Feb: 88.9%
- Mar: 80.5%
- Apr: 85.0%
- May: 78.6%
- Jun: 76.0%
- Jul: 74.2%
- Aug: 78.5%
- Sep: 83.8%
- Oct: 86.8%
- Nov: 86.0%
- Dec: 87.2%
July is historically the weakest month and February the strongest, a spread of 14.7 percentage points.
Reliability over time
July 2023 – July 2026
- July 2023: 73.5% from 355 flights
- August 2023: 80.3% from 312 flights
- September 2023: 83.5% from 333 flights
- October 2023: 83.5% from 383 flights
- November 2023: 87.2% from 362 flights
- December 2023: 86.2% from 356 flights
- January 2024: 79.7% from 332 flights
- February 2024: 89.5% from 306 flights
- March 2024: 76.8% from 388 flights
- April 2024: 85.3% from 364 flights
- May 2024: 75.3% from 379 flights
- June 2024: 75.7% from 359 flights
- July 2024: 66.6% from 363 flights
- August 2024: 76.6% from 321 flights
- September 2024: 82.7% from 331 flights
- October 2024: 89.1% from 387 flights
- November 2024: 88.8% from 365 flights
- December 2024: 84.1% from 330 flights
- January 2025: 87.2% from 312 flights
- February 2025: 86.9% from 298 flights
- March 2025: 87.5% from 336 flights
- April 2025: 87.3% from 317 flights
- May 2025: 79.7% from 315 flights
- June 2025: 72.6% from 289 flights
- July 2025: 78.4% from 287 flights
- August 2025: 78.6% from 285 flights
- September 2025: 85.5% from 255 flights
- October 2025: 88.2% from 292 flights
- November 2025: 81.4% from 312 flights
- December 2025: 91.6% from 309 flights
- January 2026: 90.3% from 282 flights
- February 2026: 90.3% from 292 flights
- March 2026: 77.7% from 323 flights
- April 2026: 82.0% from 293 flights
- May 2026: 82.0% from 264 flights
- June 2026: 80.1% from 261 flights
- July 2026: 80.2% from 264 flights
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 84.0% against 83.7% in the 12 months before — broadly unchanged.
Data and methodology
Calculated by FlyerIntel from 11,912 LAS → IAH flight records from the US DOT Bureau of Transportation Statistics, covering July 2023 – July 2026. Late means 15 or more minutes past scheduled arrival; cancelled and diverted flights are left out of on-time rates.
Full methodology · Data sources · Report a problem
Related research: How Long a Layover Needs to Be · Two Airlines on One Route · Best Time of Day to Fly From Major US Airports
Analysis last recomputed