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

No clear winner: Frontier’s DEN → SEA flights land within a few points of 4 in 5 on time whatever the hour.

Best time to leave 12–1 pm 89% arrive on time from DEN
Best single flight F9 4545 DEN 07:45 → SEA 09:48 · 82% on time Avoid F9 1175 DEN 12:00 → SEA 14:01 · 81% 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).

7
8
9
10
11
12
DEN
88
82
96
% 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 4545 DEN 07:45 SEA 09:48 82%
F9 1175 DEN 12:00 SEA 14:01 81%

All 2 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 4545 DEN 07:45 SEA 09:48 3h 04m 209 82% 1.0% 52 min
F9 1175 DEN 12:00 SEA 14:01 3h 04m 181 81% 2.2% 58 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 SEA 3h 04m 80% 1.4% 431 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