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5,291 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 88% depart on time. After 4 pm it’s 2 in 3.

Best time to leave 11 am–12 pm 88% arrive on time from ATL
Best single flight UA 425 ATL 11:37 → IAH 12:47 · 89% on time Avoid DL 1131 ATL 18:39 → IAH 19:52 · 59% 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).

6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
ATL
75
91
87
83
77
89
85
85
70
74
66
74
65
78
60
53
72
% 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
Houston flights leaving ATL 6–7 am: 1Close ×
F9 1403 ATL 06:07 IAH 07:23 2h 16m 325 76% 1.2% 82 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 (incl. SkyWest, Mesa) 1,630 84% 0.7% 75 min
Delta 2,521 76% 1.9% 57 min
Frontier 798 71% 1.9% 84 min
Spirit 342 66% 5.0% 81 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 425 ATL 11:37 IAH 12:47 89%
UA 532 ATL 07:05 IAH 08:15 89%
DL 1572 ATL 12:30 IAH 13:38 86%
DL 1682 ATL 10:05 IAH 11:18 83%
DL 1585 ATL 07:30 IAH 08:37 81%
· · ·
DL 1223 ATL 16:25 IAH 17:39 68%
F9 4075 ATL 21:25 IAH 22:48 63%
DL 1131 ATL 18:39 IAH 19:52 59%
All 18 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 ATL IAH 2h 27m 84% 0.7% 1,630 Flying now
Delta ATL IAH 2h 13m 76% 1.9% 2,521 Flying now
Frontier ATL IAH 2h 22m 71% 1.9% 798 Flying now
Spirit ATL IAH 2h 18m 66% 5.0% 342 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