Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

Connect in the morning. The same one-hour layover misses 17% of the time at 10 am and 36% of the time at 3 pm.

Nonstops


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

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach San Juan on time. Total trip = scheduled departure to arrival, layover included. Layovers up to 4 hours. Pick a connection for the details.


American Details →	JFK 05:55 → MIA 09:12AA 655	2h 05m Miami	MIA 11:17 → SJU 14:12AA 2584	8h 17m	97%	88%
American Details →	JFK 05:59 → CLT 07:57AA 2643	3h 06m Charlotte	CLT 11:03 → SJU 14:50AA 783	8h 51m	98%	82%
JetBlue Details →	JFK 05:01 → MCO 07:43B6 883	3h 19m Orlando	MCO 11:02 → SJU 14:04B6 133	9h 03m	96%	80%
JetBlue Details →	JFK 12:15 → FLL 15:24B6 2201	3h 51m Fort Lauderdale	FLL 19:15 → SJU 21:53B6 553	9h 42m	97%	77%
American Details →	JFK 07:30 → MIA 10:45AA 2017	2h 18m Miami	MIA 13:03 → SJU 15:47AA 2581	8h 17m	95%	76%
Delta Details →	JFK 08:40 → ATL 11:14DL 2227	1h 52m Atlanta	ATL 13:06 → SJU 16:46DL 1946	8h 06m	94%	75%
Delta Details →	JFK 06:00 → BOS 07:24DL 5765 · flown by Republic	1h 26m Boston	BOS 08:50 → SJU 12:54DL 1780	6h 54m	95%	71%
Delta Details →	JFK 06:00 → ATL 08:24DL 2286	1h 21m Atlanta	ATL 09:45 → SJU 13:31DL 1882	7h 31m	93%	71%
Tight connection: often missed
American Details →	JFK 11:45 → MIA 14:50AA 525	50m Miami	MIA 15:40 → SJU 18:24AA 3165	6h 39m	70%	51%
American Details →	JFK 15:30 → CLT 17:44AA 1294	1h 17m Charlotte	CLT 19:01 → SJU 22:45AA 2830	7h 21m	67%	44%
JetBlue Details →	JFK 10:48 → MCO 13:52B6 383	46m Orlando	MCO 14:38 → SJU 17:33B6 1133	6h 55m	57%	39%

Same layover, different day-part

How often the first flight arrives too late to connect (45 min minimum), for one-ticket layovers of 45–80 minutes.

Morning

CLT · 56m · leaves 07:59 17%

Afternoon and evening

ATL · 1h 14m · leaves 13:10 9%

CLT · 1h 17m · leaves 15:30 33%

FLL · 56m · leaves 12:15 36%

Delays build through the day, so an afternoon first leg eats the layover. A short connection is fine early in the morning and a gamble later on.

Mixing airlines

One ticketMiss it and the airline rebooks you; bags go through. 45 min is enough.

Separate ticketsMiss it and you buy a new ticket. Re-check bags, clear security again: we require 90 min.


Delta DL 2049 JFK 07:05 → MCO Southwest WN 1465 MCO 12:10 → SJU Connection details →	2h 10m	8h 00m	94%	78%
JetBlue B6 883 JFK 05:01 → MCO Frontier F9 2250 MCO 10:17 → SJU Connection details →	2h 34m	8h 15m	91%	76%
Delta DL 1528 JFK 07:05 → MIA American AA 2581 MIA 13:03 → SJU Connection details →	2h 42m	8h 42m	97%	76%

Rank all connections, any airlines →

Regional partners count as the airline that sells them: SkyWest flying Delta Connection is one Delta ticket.

How these are worked out. Makes the connection: share of the last year’s flights where the first flight arrived with at least 45 minutes to spare (90 on separate tickets). Arrives on time: first flight not cancelled × connection made × second flight not cancelled and arriving within 15 minutes. Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.

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