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Showing Frontier only (incl. its regional partners)All airlines ×
1,023 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 96% depart on time. After 4 pm it’s 68%.

Best time to leave 7–8 am 100% arrive on time from DEN
Best single flight F9 3861 DEN 15:00 → SLC 16:37 · 96% on time Avoid F9 4251 DEN 20:16 → SLC 21:59 · 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).

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DEN
95
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78
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65
% 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

Pick an hour to see this route’s flights leaving then.

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 3861 DEN 15:00 SLC 16:37 96%
F9 3981 DEN 13:18 SLC 14:55 86%
F9 3219 DEN 06:00 SLC 07:31 83%
F9 4251 DEN 20:16 SLC 21:59 71%

All 5 Frontier flights in the current schedule

Every flight that flew in the Jun 6 – Jul 31, 2026 schedule, with its record over Aug 2025 – Jul 2026. Times are local. Click a column to sort.
F9 3219 DEN 06:00 SLC 07:31 1h 31m 199 83% 1.0% 52 min
F9 4235 DEN 08:28 SLC 10:00 1h 33m 48 94% 0.0% 36 min
F9 3981 DEN 13:18 SLC 14:55 1h 37m 167 86% 0.0% 62 min
F9 3861 DEN 15:00 SLC 16:37 1h 37m 178 96% 0.0% 68 min
F9 4251 DEN 20:16 SLC 21:59 1h 39m 264 71% 0.0% 57 min

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.
Frontier DEN SLC 1h 37m 83% 0.3% 1,023 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