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2,095 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Delta is clearly ahead here: 9 in 10 of its flights arrive on time, 36 points better than Frontier.

Best time to leave 7–8 am 92% arrive on time from SJU
Best single flight DL 1879 SJU 06:00 → ATL 09:50 · 96% on time Avoid F9 2871 SJU 17:15 → ATL 21:35 · 54% 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).

6
7
8
9
10
11
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14
15
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18
SJU
95
94
85
89
84
65
58
77
81
% 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.

Airlines on this route

Arriving within 15 minutes. Regional flights count under the airline that sells them. Pick an airline to see its flights.
Delta 1,627 91% 0.9% 81 min
Frontier 375 55% 2.1% 91 min
Spirit 93 – 6.5% 66 min

Dimmed: fewer than 150 flights in the year, too few to rank.

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.
DL 1879 SJU 06:00 ATL 09:50 96%
DL 1763 SJU 07:30 ATL 11:20 96%
DL 1757 SJU 12:54 ATL 16:47 92%
DL 1946 SJU 17:56 ATL 21:54 88%
DL 1882 SJU 14:41 ATL 18:37 87%
· · ·
F9 2871 SJU 17:15 ATL 21:35 54%

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.
Delta SJU ATL 3h 56m 91% 0.9% 1,627 Flying now
Frontier SJU ATL 4h 20m 55% 2.1% 375 Flying now
Spirit SJU ATL 3h 20m 25% 6.5% 93 Not 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