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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 in the current schedule

Every flight that flew in the Jun 6 – Jul 31, 2026 schedule, with its record over Aug 2025 – Jul 2026. Times are local. Click a column to sort.
UA 2310 ORD 05:30 IAH 08:18 2h 48m 72 93% 0.0% 49 min
UA 1799 ORD 06:29 IAH 09:18 2h 49m 72 92% 0.0% 42 min
WN 4497 MDW 06:40 HOU 09:15 2h 35m 42 88% 0.0% 41 min
AA 1909 ORD 07:30 IAH 10:20 2h 46m 72 64% 2.8% 90 min
UA 1231 ORD 07:35 IAH 10:36 3h 01m 239 91% 1.3% 72 min
UA 535 ORD 08:51 IAH 11:51 3h 00m 72 80% 0.0% 42 min
AA 1915 ORD 10:00 IAH 12:46 2h 46m 72 67% 0.0% 57 min
WN 2783 MDW 10:10 HOU 12:50 2h 40m 42 86% 0.0% 58 min
UA 2638 ORD 10:25 IAH 13:23 2h 58m 228 87% 0.0% 55 min
UA 723 ORD 10:30 IAH 13:28 2h 58m 35 82% 0.0% 61 min
WN 709 MDW 11:50 HOU 14:25 2h 35m 42 50% 0.0% 48 min
UA 2821 ORD 12:40 IAH 15:40 3h 00m 24 79% 0.0% 65 min
UA 1448 ORD 12:40 IAH 15:40 3h 00m 125 89% 0.8% 91 min
AA 4426flown by Republic ORD 13:29 IAH 16:27 2h 56m 62 83% 3.2% 79 min
UA 1862 ORD 14:05 IAH 17:10 3h 05m 35 62% 0.0% 51 min
UA 2451 ORD 14:15 IAH 17:20 3h 05m 37 78% 0.0% 82 min
WN 1124 MDW 15:00 HOU 17:35 2h 35m 12 55% 8.3% 31 min
AA 1913 ORD 15:07 IAH 18:01 2h 54m 72 52% 2.8% 70 min
UA 714 ORD 16:05 IAH 19:10 3h 05m 170 74% 0.0% 87 min
F9 3135 ORD 17:29 IAH 20:52 3h 17m 263 78% 3.8% 103 min
WN 2785 MDW 17:40 HOU 20:15 2h 35m 57 56% 3.5% 51 min
UA 1954 ORD 17:45 IAH 20:50 3h 05m 72 77% 1.4% 64 min
UA 1475 ORD 18:40 IAH 21:36 2h 56m 149 62% 0.7% 89 min
WN 1431 MDW 19:15 HOU 21:50 2h 35m 42 51% 2.4% 48 min
UA 2813 ORD 20:02 IAH 22:59 2h 57m 72 56% 2.8% 72 min
WN 2787 MDW 21:00 HOU 23:38 2h 38m 16 62% 0.0% 85 min
AA 3144 ORD 21:07 IAH 23:51 2h 44m 272 53% 5.5% 78 min
WN 954 MDW 21:40 HOU 00:12 2h 32m 34 42% 2.9% 75 min
UA 2665 ORD 21:40 IAH 00:34 2h 54m 218 76% 2.3% 92 min

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