Route on-time record
LAS to IAH: most on-time flights and the best time to fly
Las Vegas (Harry Reid International Airport) to Houston (George Bush Intercontinental Airport). 3,483 nonstop flights in Jun 2025 to May 2026, 83% arrived within 15 minutes and 1.0% were cancelled. The most reliable flight number was United 2608 at 6:00 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
LAS → IAH
Las Vegas to Houston: 3,483 nonstop flights a year
On time (12 months)
83%
Cancelled
1.0%
avg delay 13 min
Best time to leave
Before 9 AM
92% on time vs 74% 3 to 6 PM
Most reliable airline
United
84% chance on time
Lowest nonstop fare seen in the next two months: $185 (Frontier 4132 on 2026-10-30). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · United 2608
6:00 AM → 11:08 AM3h 08m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 2417; its record covers all of them.
94%
chance on time
- On time (history)
- 95%
- Cancelled
- 1.4%
- Avg arrival delay
- 3 min
- Arrived on time 95% of the time (271 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; 3 to 6 PM: 74%).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
Strong track record · 271 flights
Find United 2608 fares Opens this date on Aviasales#2 · United 2017
12:36 AM → 5:34 AM2h 58m nonstop
Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as United 2009, 1490; its record covers all of them.
92%
chance on time
- On time (history)
- 92%
- Cancelled
- 0.7%
- Avg arrival delay
- 4 min
- Arrived on time 92% of the time (277 flights, Jun 2025 to May 2026).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
Strong track record · 277 flights
Find United 2017 fares Opens this date on Aviasales#3 · United 1181
8:05 AM → 1:13 PM3h 07m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 1354; its record covers all of them.
91%
chance on time
- On time (history)
- 92%
- Cancelled
- 2.1%
- Avg arrival delay
- 9 min
- Arrived on time 92% of the time (282 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; 3 to 6 PM: 74%).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
- Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
Strong track record · 282 flights
Find United 1181 fares Opens this date on Aviasales#4 · United 2753
12:59 AM → 5:59 AM3h 00m nonstop
Local times, typical schedule. Last flown 2026-05-31.
89%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 6 min
- Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
- Short track record (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find United 2753 fares Opens this date on Aviasales#5 · United 1711
10:20 AM → 3:28 PM3h 08m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.3%
- Avg arrival delay
- 12 min
- Arrived on time 88% of the time (286 flights, Jun 2025 to May 2026).
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
Strong track record · 286 flights
Find United 1711 fares Opens this date on Aviasales#6 · United 1652
4:45 PM → 9:46 PM3h 01m nonstop
Local times, typical schedule. Last flown 2026-03-28.
85%
chance on time
- On time (history)
- 86%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 86% of the time (70 flights, Jun 2025 to May 2026).
- Never cancelled in 70 scheduled flights.
- Leaves in this route's least on-time window (3 to 6 PM: 74% on time; Before 9 AM: 92%).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
Moderate track record · 70 flights
Find United 1652 fares Opens this date on Aviasales#7 · United 2449
4:57 PM → 10:05 PM3h 08m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
chance on time
- On time (history)
- 84%
- Cancelled
- 3.2%
- Avg arrival delay
- 9 min
- Arrived on time 84% of the time (61 flights, Jun 2025 to May 2026).
- Cancelled 3.2% of the time (2 of 63).
- Leaves in this route's least on-time window (3 to 6 PM: 74% on time; Before 9 AM: 92%).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
Moderate track record · 61 flights
Find United 2449 fares Opens this date on Aviasales#8 · United 2492
12:20 PM → 5:25 PM3h 07m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
chance on time
- On time (history)
- 83%
- Cancelled
- 0.4%
- Avg arrival delay
- 13 min
- Arrived on time 83% of the time (233 flights, Jun 2025 to May 2026).
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
Strong track record · 233 flights
Find United 2492 fares Opens this date on Aviasales#9 · United 2864
12:04 PM → 5:10 PM3h 06m nonstop
Local times, typical schedule. Last flown 2026-04-29.
81%
chance on time
- On time (history)
- 79%
- Cancelled
- 0.0%
- Avg arrival delay
- 9 min
- Arrived on time 79% of the time (29 flights, Jun 2025 to May 2026).
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
- Short track record (29 flights), so its score leans on the airline's record at this hour.
Limited track record · 29 flights
Find United 2864 fares Opens this date on Aviasales#10 · Frontier 1490
7:15 AM → 12:33 PM3h 18m nonstop
Local times, typical schedule. Last flown 2026-05-31.
81%
chance on time
- On time (history)
- 82%
- Cancelled
- 1.0%
- Avg arrival delay
- 10 min
- Arrived on time 82% of the time (195 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; 3 to 6 PM: 74%).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
- Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
Moderate track record · 195 flights
Find Frontier 1490 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines84%
2,606 flights · 85% on time as flown · 0.7% cancel
- Frontier Airlines79%
291 flights · 79% on time as flown · 0.8% cancel
- Spirit Airlines76%
586 flights · 77% on time as flown · 2.0% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM92%
783 flights · avg delay 6 min
- 9 AM to noon84%
682 flights · avg delay 13 min
- Noon to 3 PM76%
662 flights · avg delay 17 min
- 3 to 6 PM74%
462 flights · avg delay 20 min
- 6 to 9 PM80%
264 flights · avg delay 17 min
- After 9 PM87%
630 flights · avg delay 12 min
Best day: Wednesday (88%). Worst: Sunday (79%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Late-arriving aircraft35%
- Airline (crew, maintenance, boarding)31%
- Air traffic control and airport volume30%
- Severe weather4%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
LAS to IAH questions
- What time of day is best to fly LAS to IAH?
- Before 9 AM: 92% of flights arrived on time, against 74% for departures 3 to 6 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from LAS to IAH?
- United, with a season-adjusted 84% chance of operating and arriving on time over 2,606 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on LAS to IAH?
- July (73% on time); the best was February (89%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from LAS
- IAH to LAS (return)
- LAS to LAX 79%
- LAS to DEN 77%
- LAS to SAN 68%
- LAS to PHX 78%
- LAS to SFO 66%
- LAS to SEA 82%
- LAS to ORD 77%
- LAS to DFW 81%
- LAS to ATL 84%
- LAS to SNA 82%
- LAS to SMF 79%
- LAS to BUR 80%
Live status: FAA delays and ground stops