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3,590 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 86% depart on time. After 4 pm it’s 3 in 5.

Best time to leave 5–6 am 82% arrive on time from JFK
Best single flight DL 1961 JFK 12:30 → SJU 16:29 · 84% on time Avoid B6 2903 JFK 18:29 → SJU 22:45 · 60% 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).

5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
JFK
89
87
80
86
77
60
67
82
66
72
60
71
57
58
66
60
57
62
% 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 1,104 78% 2.3% 60 min
JetBlue 2,232 69% 3.4% 79 min
Frontier 254 56% 3.5% 109 min

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 1961 JFK 12:30 SJU 16:29 84%
DL 1966 JFK 08:00 SJU 12:00 80%
B6 1603 JFK 08:29 SJU 12:27 77%
B6 403 JFK 05:01 SJU 08:47 73%
B6 503 JFK 10:00 SJU 14:14 72%
· · ·
B6 803 JFK 16:10 SJU 20:18 66%
B6 703 JFK 12:00 SJU 15:59 65%
B6 2903 JFK 18:29 SJU 22:45 60%
All 11 flights on this route →

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 JFK SJU 4h 00m 78% 2.3% 1,104 Flying now
JetBlue JFK SJU 4h 00m 69% 3.4% 2,232 Flying now
Frontier JFK SJU 3h 57m 56% 3.5% 254 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