Route on-time record

IAH to LAS: most on-time flights and the best time to fly

Houston (George Bush Intercontinental Airport) to Las Vegas (Harry Reid International Airport). 3,485 nonstop flights in Jun 2025 to May 2026, 82% arrived within 15 minutes and 0.8% were cancelled. The most reliable flight number was United 1264 at 7:35 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

IAH → LAS

Houston to Las Vegas: 3,485 nonstop flights a year

On time (12 months)

82%

Cancelled

0.8%

avg delay 14 min

Best time to leave

Before 9 AM

91% on time vs 74% 6 to 9 PM

Most reliable airline

United

83% chance on time

Check IAH to LAS fares

Lowest nonstop fare seen in the next two months: $133 (Frontier 1965 on 2026-11-13). 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 1264
7:35 AM → 9:03 AM3h 28m nonstop
Local times, typical schedule. Last flown 2026-05-31.
94%
chance on time
On time (history)
94%
Cancelled
0.0%
Avg arrival delay
4 min
- Arrived on time 94% of the time (314 flights, Jun 2025 to May 2026).
- Never cancelled in 314 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; 6 to 9 PM: 74%).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Strong track record · 314 flights
Find United 1264 fares Opens this date on Aviasales
#2 · United 1799
9:34 AM → 11:12 AM3h 28m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
On time (history)
89%
Cancelled
0.5%
Avg arrival delay
5 min
- Arrived on time 89% of the time (363 flights, Jun 2025 to May 2026).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
Strong track record · 363 flights
Find United 1799 fares Opens this date on Aviasales
#3 · United 1964
1:58 PM → 3:36 PM3h 38m nonstop
Local times, typical schedule. Last flown 2026-03-28.
88%
chance on time
On time (history)
96%
Cancelled
0.0%
Avg arrival delay
1 min
- Arrived on time 96% of the time (24 flights, Jun 2025 to May 2026).
- Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (24 flights), so its score leans on the airline's record at this hour.
Limited track record · 24 flights
Find United 1964 fares Opens this date on Aviasales
#4 · United 1524
12:25 PM → 1:54 PM3h 29m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
On time (history)
88%
Cancelled
0.0%
Avg arrival delay
9 min
- Arrived on time 88% of the time (159 flights, Jun 2025 to May 2026).
- Never cancelled in 159 scheduled flights.
- Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
Moderate track record · 159 flights
Find United 1524 fares Opens this date on Aviasales
#5 · United 1346
4:55 PM → 6:24 PM3h 29m nonstop
Local times, typical schedule. Last flown 2026-05-19. Same departure also flew as United 539; its record covers all of them.
86%
chance on time
On time (history)
88%
Cancelled
0.0%
Avg arrival delay
11 min
- Arrived on time 88% of the time (48 flights, Jun 2025 to May 2026).
- Never cancelled in 48 scheduled flights.
- Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
- Short track record (48 flights), so its score leans on the airline's record at this hour.
Limited track record · 48 flights
Find United 1346 fares Opens this date on Aviasales
#6 · Spirit 2826
9:28 AM → 10:46 AM3h 18m nonstop
Local times, typical schedule. Last flown 2026-05-01.
83%
chance on time
On time (history)
75%
Cancelled
0.0%
Avg arrival delay
8 min
- Arrived on time 75% of the time (12 flights, Jun 2025 to May 2026).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (12 flights), so its score leans on the airline's record at this hour.
Limited track record · 12 flights
Find Spirit 2826 fares Opens this date on Aviasales
#7 · United 1971
2:20 PM → 3:49 PM3h 29m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
chance on time
On time (history)
83%
Cancelled
0.0%
Avg arrival delay
14 min
- Arrived on time 83% of the time (364 flights, Jun 2025 to May 2026).
- Never cancelled in 365 scheduled flights.
- Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
Strong track record · 364 flights
Find United 1971 fares Opens this date on Aviasales
#8 · Spirit 3412
8:00 AM → 9:19 AM3h 19m nonstop
Local times, typical schedule. Last flown 2026-04-11.
82%
chance on time
On time (history)
89%
Cancelled
5.3%
Avg arrival delay
22 min
- Arrived on time 89% of the time (18 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; 6 to 9 PM: 74%).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
- 95% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 18 flights
Find Spirit 3412 fares Opens this date on Aviasales
#9 · United 1360
8:25 PM → 9:57 PM3h 32m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 1331, 1183; its record covers all of them.
81%
chance on time
On time (history)
85%
Cancelled
0.5%
Avg arrival delay
10 min
- Arrived on time 85% of the time (194 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 74% on time; Before 9 AM: 91%).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Moderate track record · 194 flights
Find United 1360 fares Opens this date on Aviasales
#10 · United 2190
4:20 PM → 5:57 PM3h 37m nonstop
Local times, typical schedule. Last flown 2026-03-28.
80%
chance on time
On time (history)
82%
Cancelled
2.2%
Avg arrival delay
11 min
- Arrived on time 82% of the time (44 flights, Jun 2025 to May 2026).
- Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
- 53% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (44 flights), so its score leans on the airline's record at this hour.
Limited track record · 44 flights
Find United 2190 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

United Airlines83%
2,607 flights · 84% on time as flown · 0.5% cancel
Spirit Airlines80%
587 flights · 81% on time as flown · 1.7% cancel
Frontier Airlines71%
291 flights · 69% on time as flown · 1.2% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

Before 9 AM91%
483 flights · avg delay 8 min
9 AM to noon88%
602 flights · avg delay 8 min
Noon to 3 PM83%
758 flights · avg delay 15 min
3 to 6 PM81%
484 flights · avg delay 10 min
6 to 9 PM74%
811 flights · avg delay 21 min
After 9 PM76%
347 flights · avg delay 21 min

Best day: Wednesday (85%). Worst: Friday (76%).

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 aircraft38%
Airline (crew, maintenance, boarding)36%
Air traffic control and airport volume20%
Severe weather6%

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

IAH to LAS questions

What time of day is best to fly IAH to LAS?: Before 9 AM: 91% of flights arrived on time, against 74% for departures 6 to 9 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 IAH to LAS?: United, with a season-adjusted 83% chance of operating and arriving on time over 2,607 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 IAH to LAS?: June (67% on time); the best was February (87%), 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 IAH

Live status: FAA delays and ground stops

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