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1,657 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

United is clearly ahead here: 4 in 5 of its flights arrive on time, 15 points better than Southwest.

Best time to leave 9–10 am 87% arrive on time from DEN
Best single flight UA 1308 DEN 10:05 → PIT 15:16 · 85% 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).

9
10
11
12
13
14
15
16
17
18
19
DEN
84
80
80
79
80
37
47
75
52
41
% 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
Pittsburgh flights leaving DEN 10–11 am: 2Close ×
UA 1308 DEN 10:05 PIT 15:16 3h 11m 279 85% 0.4% 48 min
WN 4012 DEN 10:05 PIT 15:15 3h 10m 58 76% 0.0% 52 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 850 81% 0.5% 57 min
Southwest 766 66% 0.3% 55 min
Frontier 41 – 0.0% 36 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 1308 DEN 10:05 PIT 15:16 85%
All 6 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 PIT 3h 06m 81% 0.5% 850 Flying now
Southwest DEN PIT 3h 00m 66% 0.3% 766 Flying now
Frontier DEN PIT 3h 07m 98% 0.0% 41 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