4,715 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 3 in 4.

Best time to leave 5–6 am 97% arrive on time from IAH

Best single flight UA 1066 IAH 22:10 → DEN 23:57 · 90% on time Avoid F9 3227 IAH 18:14 → DEN 19:58 · 65% 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	3,899	83%	0.3%	68 min
Frontier	816	80%	1.0%	76 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 1066	IAH 22:10	DEN 23:57	90%
F9 3229	IAH 06:30	DEN 08:06	88%
UA 1409	IAH 10:31	DEN 12:07	83%
UA 2339	IAH 20:22	DEN 22:15	76%
UA 1654	IAH 18:19	DEN 20:14	66%
· · ·
F9 3227	IAH 18:14	DEN 19:58	65%

All 20 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	DEN	2h 40m	83%	0.3%	3,899	Flying now
Frontier	IAH	DEN	2h 49m	80%	1.0%	816	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