3,465 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 93% depart on time. After 4 pm it’s 3 in 4.

Best time to leave 7–8 am 95% arrive on time from IAD

Best single flight UA 1587 IAD 12:48 → DEN 14:42 · 92% on time Avoid UA 599 IAD 17:41 → DEN 19:45 · 74% 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).

IAD

% 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

Denver flights leaving IAD 12–1 pm: 1Close ×


UA 1587	IAD 12:48	DEN 14:42	3h 54m	291	92%	0.3%	83 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	2,787	85%	0.5%	70 min
Southwest	678	79%	0.9%	53 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 1587	IAD 12:48	DEN 14:42	92%
UA 495	IAD 22:23	DEN 00:30	84%
UA 599	IAD 17:41	DEN 19:45	74%

All 11 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	IAD	DEN	4h 04m	85%	0.5%	2,787	Flying now
Southwest	IAD	DEN	3h 55m	79%	0.9%	678	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