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

No clear winner: airlines and hours on this route all land within a few points of 3 in 4 on time.

Nonstops


American	MIA	SJU	2h 39m	78%	0.5%	2,109	Flying now
Frontier	MIA	SJU	2h 37m	72%	1.6%	379	Flying now
Spirit	MIA	SJU	2h 35m	60%	4.7%	150	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.


Southwest Details →	MIA 05:25 → MCO 06:30WN 4086	1h 20m Orlando	MCO 07:50 → SJU 10:45WN 2702	5h 20m	96%	82%
American Details →	MIA 06:21 → CLT 08:35AA 2187	2h 28m Charlotte	CLT 11:03 → SJU 14:50AA 783	8h 29m	98%	82%
Delta Details →	MIA 08:17 → ATL 10:20DL 1261	2h 46m Atlanta	ATL 13:06 → SJU 16:46DL 1946	8h 29m	99%	80%
Delta Details →	MIA 07:05 → JFK 10:00DL 2428	2h 30m New York	JFK 12:30 → SJU 16:29DL 1961	9h 24m	98%	79%
United Details →	MIA 06:30 → IAH 08:24UA 2074	1h 39m Houston	IAH 10:03 → SJU 15:42UA 1192	9h 12m	100%	79%
Delta Details →	MIA 06:00 → ATL 08:05DL 1249	1h 40m Atlanta	ATL 09:45 → SJU 13:31DL 1882	7h 31m	96%	72%
United Details →	MIA 13:10 → IAD 15:53UA 2435	1h 31m Dulles	IAD 17:24 → SJU 21:24UA 2025	8h 14m	93%	67%
American Details →	MIA 13:30 → CLT 15:48AA 2297	3h 13m Charlotte	CLT 19:01 → SJU 22:45AA 2830	9h 21m	98%	65%
Tight connection: often missed
American Details →	MIA 14:28 → DFW 16:50AA 2762	1h 02m Dallas-Fort Worth	DFW 17:52 → SJU 23:50AA 702	9h 22m	69%	41%
American Details →	MIA 19:30 → DFW 21:45AA 3104	1h 02m Dallas-Fort Worth	DFW 22:47 → SJU 04:39 +1AA 514	9h 09m	61%	29%
American Details →	MIA 15:00 → PHL 17:57AA 797	53m Philadelphia	PHL 18:50 → SJU 22:57AA 3065	7h 57m	55%	25%

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 · 53m · leaves 07:57 21%

Afternoon and evening

DFW · 1h 02m · leaves 19:30 39%

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.


American AA 2090 MIA 07:35 → MCO Southwest WN 1465 MCO 12:10 → SJU Connection details →	3h 20m	7h 30m	100%	88%
Southwest WN 4086 MIA 05:25 → MCO Frontier F9 2250 MCO 10:17 → SJU Connection details →	3h 47m	7h 51m	96%	83%
American AA 1040 MIA 06:00 → JFK Delta DL 1961 JFK 12:30 → SJU Connection details →	3h 25m	10h 29m	99%	80%

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