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

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

No clear winner: Frontier’s MIA → SJU flights land within a few points of 72% on time whatever the hour.

Best time to leave 2–3 pm 68% arrive on time from MIA

Best single flight F9 2284 MIA 14:50 → SJU 17:26 · 77% on time Avoid F9 3378 MIA 21:33 → SJU 00:28 · 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).

MIA

% 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 2284	MIA 14:50	SJU 17:26	77%
F9 3378	MIA 21:33	SJU 00:28	71%

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 2284	MIA 14:50	SJU 17:26	2h 36m	177	77%	2.3%	114 min
F9 3378	MIA 21:33	SJU 00:28	2h 46m	154	71%	1.3%	65 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	MIA	SJU	2h 37m	72%	1.6%	379	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