Showing Frontier only (incl. its regional partners)All airlines ×

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

Leave before 9 am: almost all depart on time. After 4 pm it’s 65%.

Best time to leave 6–7 am 97% arrive on time from DEN

Best single flight F9 3439 DEN 22:29 → SFO 00:23 · 70% on time Avoid F9 1093 DEN 18:58 → SFO 20:54 · 62% 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).

DEN

% 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 3439	DEN 22:29	SFO 00:23	70%
F9 1229	DEN 09:47	SFO 11:43	66%
F9 1093	DEN 18:58	SFO 20:54	62%

All 3 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 1229	DEN 09:47	SFO 11:43	2h 56m	174	66%	0.0%	52 min
F9 1093	DEN 18:58	SFO 20:54	2h 56m	191	62%	0.0%	69 min
F9 3439	DEN 22:29	SFO 00:23	2h 54m	273	70%	1.5%	49 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	SFO	2h 56m	67%	0.6%	638	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