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3,676 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 92% depart on time. After 4 pm it’s 3 in 5.

Best time to leave 6–7 am 96% arrive on time from STL
Best single flight F9 4567 STL 20:08 → DEN 21:44 · 76% 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).

5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
STL
92
96
92
90
85
78
77
77
78
75
62
59
45
50
77
71
58
45
% 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 STL 8–9 am: 1Close ×
WN 3910 STL 08:42 DEN 10:02 2h 20m 50 90% 0.0% 32 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) 1,210 80% 0.6% 84 min
Frontier 291 76% 0.7% 81 min
Southwest 2,175 75% 0.0% 61 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.
F9 4567 STL 20:08 DEN 21:44 76%
All 12 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 STL DEN 2h 33m 80% 0.6% 1,210 Flying now
Frontier STL DEN 2h 36m 76% 0.7% 291 Flying now
Southwest STL DEN 2h 20m 75% 0.0% 2,175 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