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9,068 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 72%.

Best time to leave 7–8 am 92% arrive on time from IAH, 91% arrive on time from HOU
Best airport pair IAH → IAD 82% on time, fewest cancelled (0.4%), 1,871 flights
Best single flight UA 1549 IAH 07:20 → IAD 11:28 · 92% on time Avoid UA 1627 IAH 18:05 → DCA 22:15 · 66% on time

Time of day × airport

Share of flights leaving within 15 minutes, by scheduled departure hour: all flights from that airport, wherever they’re going. Blank: fewer than 40 flights.

5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
IAH
92
91
91
87
86
83
83
84
77
81
76
78
72
74
71
76
79
81
85
HOU
94
95
93
90
91
85
82
73
74
65
65
67
64
66
56
62
61
55
% leaving within 15 min, all flights from that airport: 85+75–8465–7455–64under 55

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) 5,183 79% 0.6% 66 min
Spirit IAH→BWI only 332 79% 1.8% 60 min
American (incl. PSA, Republic) IAH→DCA only 873 74% 5.6% 87 min
Southwest 2,531 73% 1.5% 51 min
Frontier IAH→BWI only 149 – 5.4% 73 min

Dimmed: fewer than 150 flights in the year, too few to rank.

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 1549 IAH 07:20 IAD 11:28 92%
UA 2311 IAH 09:47 DCA 13:57 84%
UA 2366 IAH 12:13 IAD 16:30 82%
UA 1720 IAH 12:16 BWI 16:30 81%
UA 654 IAH 11:55 DCA 16:03 75%
· · ·
UA 1373 IAH 18:32 IAD 22:43 73%
UA 2224 IAH 19:50 DCA 23:59 70%
UA 1627 IAH 18:05 DCA 22:15 66%
All 37 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 IAD 3h 08m 82% 0.4% 1,871 Flying now
United IAH BWI 3h 07m 81% 0.9% 906 Flying now
United IAH DCA 3h 08m 76% 0.7% 2,406 Flying now
Southwest HOU BWI 2h 55m 75% 1.4% 1,479 Flying now
American IAH DCA 3h 10m 74% 5.6% 873 Flying now
Southwest HOU DCA 2h 55m 71% 1.7% 1,052 Flying now
Frontier IAH BWI 3h 15m 52% 5.4% 149 Flying now
Spirit IAH BWI 2h 58m 79% 1.8% 332 Not flying now
Pick a date and this becomes a forecast Coming soon: within 3 days of travel, the same ranking will use that day’s weather and our odds for each flight.

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