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3,463 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 94% depart on time. After 4 pm it’s 3 in 4.

Best time to leave 6–7 am 95% arrive on time from DEN
Best single flight UA 1279 DEN 06:13 → IAD 11:41 · 94% on time Avoid UA 2408 DEN 18:00 → IAD 23:32 · 71% 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
23
DEN
95
93
94
88
80
85
75
87
80
82
80
71
66
43
92
% 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
Dulles flights leaving DEN 11 pm–12 am: 1Close ×
UA 1924 DEN 23:59 IAD 05:27 3h 28m 341 94% 0.6% 71 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 2,786 85% 0.4% 67 min
Southwest 677 68% 0.9% 51 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 1279 DEN 06:13 IAD 11:41 94%
UA 1924 DEN 23:59 IAD 05:27 94%
UA 1101 DEN 08:00 IAD 13:26 94%
UA 347 DEN 13:53 IAD 19:22 87%
UA 2853 DEN 12:26 IAD 17:58 82%
· · ·
UA 2087 DEN 10:20 IAD 15:53 81%
UA 2408 DEN 18:00 IAD 23:32 71%
All 10 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 DEN IAD 3h 28m 85% 0.4% 2,786 Flying now
Southwest DEN IAD 3h 15m 68% 0.9% 677 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