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

1,104 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 9 in 10 depart on time. After 4 pm it’s 65%.

Best time to leave 12–1 pm 84% arrive on time from JFK

Best single flight DL 1961 JFK 12:30 → SJU 16:29 · 84% on time Avoid DL 1859 JFK 19:25 → SJU 23:43 · 70% 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).

JFK

% 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.


DL 1961	JFK 12:30	SJU 16:29	84%
DL 1966	JFK 08:00	SJU 12:00	80%
DL 1859	JFK 19:25	SJU 23:43	70%

All 3 Delta 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.


DL 1966	JFK 08:00	SJU 12:00	4h 00m	304	80%	3.6%	50 min
DL 1961	JFK 12:30	SJU 16:29	3h 59m	364	84%	1.1%	70 min
DL 1859	JFK 19:25	SJU 23:43	4h 18m	359	70%	2.2%	60 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.


Delta	JFK	SJU	4h 00m	78%	2.3%	1,104	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