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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).

5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
IAH
96
92
92
93
84
88
83
87
76
75
73
66
76
80
81
% 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
Denver flights leaving IAH 6–7 am: 2Close ×
UA 2643 IAH 06:30 DEN 08:02 2h 32m 125 96% 0.8% 53 min
F9 3229 IAH 06:30 DEN 08:06 2h 36m 356 88% 0.6% 108 min

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