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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
San Juan flights leaving JFK 6–7 pm: 1Close ×
B6 2903 JFK 18:29 SJU 22:45 4h 16m 157 60% 3.2% 90 min

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