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8,084 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 9 in 10 depart on time. After 4 pm it’s 63%.

Best time to leave 5–6 am 92% arrive on time from MDW, 92% arrive on time from ORD
Best airport pair ORD → IAH 77% on time, 1.5% cancelled, 6,114 flights
Best single flight UA 1231 ORD 07:35 → IAH 10:36 · 91% on time Avoid AA 3144 ORD 21:07 → IAH 23:51 · 53% 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
ORD
94
92
88
84
82
82
92
87
74
78
65
76
76
66
56
56
59
MDW
92
92
88
86
80
84
63
66
72
59
65
64
59
49
55
73
43
% 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 ORD→IAH only 4,040 81% 0.7% 69 min
Frontier 376 79% 3.2% 105 min
Southwest MDW→HOU only 1,857 75% 1.2% 49 min
American (incl. Envoy, PSA, SkyWest, Republic) ORD→IAH only 1,537 68% 2.6% 78 min
Spirit ORD→IAH only 274 66% 4.4% 95 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 1231 ORD 07:35 IAH 10:36 91%
UA 2638 ORD 10:25 IAH 13:23 87%
F9 3135 ORD 17:29 IAH 20:52 78%
UA 2665 ORD 21:40 IAH 00:34 76%
UA 714 ORD 16:05 IAH 19:10 74%
· · ·
AA 3144 ORD 21:07 IAH 23:51 53%
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 ORD IAH 3h 00m 81% 0.7% 4,040 Flying now
Frontier ORD IAH 3h 17m 78% 3.8% 263 Flying now
Southwest MDW HOU 2h 40m 75% 1.2% 1,857 Flying now
American ORD IAH 2h 56m 68% 2.6% 1,537 Flying now
Frontier MDW IAH 2h 52m 79% 1.8% 113 Not flying now
Spirit ORD IAH 2h 50m 66% 4.4% 274 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