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8,072 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 2 in 3.

Best time to leave 5–6 am 95% arrive on time from IAH, 90% arrive on time from HOU
Best airport pair IAH → ORD 76% on time, 1.6% cancelled, 6,119 flights
Best single flight UA 1617 IAH 08:05 → ORD 11:01 · 92% on time Avoid UA 2135 IAH 17:09 → ORD 20:05 · 68% 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
95
93
93
94
90
79
76
82
72
79
88
73
75
68
69
66
78
75
HOU
92
96
87
85
88
82
63
56
66
51
49
57
61
59
52
71
% 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
Chicago flights leaving HOU 11 am–12 pm: 2Close ×
WN 1019 HOU 11:20 MDW 13:45 2h 25m 12 73% 0.0% 39 min
WN 2763 HOU 11:30 MDW 13:55 2h 25m 16 53% 6.2% 46 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 IAH→ORD only 4,048 79% 0.7% 71 min
Southwest HOU→MDW only 1,840 73% 1.1% 50 min
American (incl. Envoy, PSA, SkyWest, Republic) IAH→ORD only 1,537 71% 3.0% 102 min
Frontier 375 68% 3.5% 137 min
Spirit IAH→ORD only 272 64% 4.8% 72 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 1617 IAH 08:05 ORD 11:01 92%
UA 2182 IAH 07:24 ORD 10:20 89%
UA 2616 IAH 06:10 ORD 09:05 88%
UA 2124 IAH 09:35 ORD 12:29 86%
UA 2417 IAH 11:55 ORD 14:51 76%
· · ·
UA 1752 IAH 22:08 ORD 00:45 71%
UA 2197 IAH 18:44 ORD 21:40 69%
UA 2135 IAH 17:09 ORD 20:05 68%
All 29 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 ORD 2h 48m 79% 0.7% 4,048 Flying now
Southwest HOU MDW 2h 25m 73% 1.1% 1,840 Flying now
American IAH ORD 2h 48m 71% 3.0% 1,537 Flying now
Frontier IAH ORD 2h 50m 66% 4.2% 262 Flying now
Frontier IAH MDW 2h 37m 75% 1.8% 113 Not flying now
Spirit IAH ORD 2h 40m 64% 4.8% 272 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