3,430 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 93% depart on time. After 4 pm it’s 73%.

Best time to leave 7–8 am 93% arrive on time from IAH

Best single flight UA 1264 IAH 07:20 → LAS 08:35 · 95% on time Avoid F9 4131 IAH 13:17 → LAS 14:29 · 74% on time

Time of day × airport

Share of this route’s flights leaving within 15 minutes, by airport and scheduled departure hour, over Aug 2025 – Jul 2026. Blank: no flights then (or fewer than 40 in the year).

IAH

% of this route’s flights leaving within 15 min (small number: flights in the Jun 6 – Jul 31, 2026 schedule): 85+75–8465–7455–64under 55

Pick an hour to see this route’s flights leaving then.

Airlines on this route

Arriving within 15 minutes. Regional flights count under the airline that sells them. Pick an airline to see its flights.


United	2,595	85%	0.3%	60 min
Spirit	466	82%	2.4%	76 min
Frontier	369	70%	3.0%	119 min

Flights, best and worst

Flights in the Jun 6 – Jul 31, 2026 schedule that ran 150+ times in the year. Times are local. Pick a flight for its history.


UA 1264	IAH 07:20	LAS 08:35	95%
UA 1524	IAH 11:55	LAS 13:13	88%
UA 1799	IAH 10:55	LAS 12:14	88%
UA 1971	IAH 14:20	LAS 15:37	85%
F9 4131	IAH 13:17	LAS 14:29	74%

All 11 flights on this route →

Nonstops by airline and airport

Arriving within 15 minutes, Aug 2025 – Jul 2026. Pick a row to see that airline’s flights on that airport pair.


United	IAH	LAS	3h 29m	85%	0.3%	2,595	Flying now
Frontier	IAH	LAS	3h 21m	70%	3.0%	369	Flying now
Spirit	IAH	LAS	3h 19m	82%	2.4%	466	Not flying now

Flying on a particular day? Pick a date above and the same ranking uses our forecast odds for each flight that day: Tomorrow.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON