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

The nonstop is quickest: Frontier JAX → SJU (3h 09m), on time 7 times in 10. American via Miami (5h 04m) is more reliable, 88%, but takes 1h 55m longer.

Nonstops (seasonal or thin)


Frontier	JAX	SJU	3h 09m	74%	4.2%	144	Flying now
JetBlue	JAX	SJU	3h 03m	71%	1.7%	117	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 →	JAX 08:00 → MIA 09:20AA 3492 · flown by Envoy	1h 57m Miami	MIA 11:17 → SJU 14:12AA 2584	6h 12m	100%	92%
United Details →	JAX 11:37 → IAH 13:11UA 4039 · flown by Mesa	1h 52m Houston	IAH 15:03 → SJU 20:38UA 701	9h 01m	97%	88%
American Details →	JAX 06:00 → MIA 07:23AA 2711	57m Miami	MIA 08:20 → SJU 11:04AA 2582	5h 04m	93%	88%
Delta Details →	JAX 05:30 → ATL 06:42DL 2722	1h 24m Atlanta	ATL 08:06 → SJU 11:44DL 1757	6h 14m	96%	84%
American Details →	JAX 06:19 → CLT 07:46AA 1834	3h 17m Charlotte	CLT 11:03 → SJU 14:50AA 783	8h 31m	99%	84%
American Details →	JAX 09:59 → MIA 11:20AA 3609 · flown by Envoy	1h 43m Miami	MIA 13:03 → SJU 15:47AA 2581	5h 48m	98%	81%
Delta Details →	JAX 08:20 → ATL 09:36DL 2569	3h 30m Atlanta	ATL 13:06 → SJU 16:46DL 1946	8h 26m	99%	80%
Delta Details →	JAX 07:05 → JFK 09:29DL 4959 · flown by Endeavor	3h 01m New York	JFK 12:30 → SJU 16:29DL 1961	9h 24m	97%	78%
Tight connection: often missed
Southwest Details →	JAX 14:22 → BWI 16:18WN 2158	47m Baltimore	BWI 17:05 → SJU 21:15WN 1103	6h 53m	57%	30%
American Details →	JAX 19:40 → DFW 21:25AA 1980	1h 22m Dallas-Fort Worth	DFW 22:47 → SJU 04:39 +1AA 514	8h 59m	58%	26%

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

EWR · 58m · leaves 06:24 6%

MIA · 57m · leaves 06:00 7%

ATL · 1h 10m · leaves 10:41 8%

Afternoon and evening

ATL · 54m · leaves 14:48 21%

BWI · 47m · leaves 14:22 43%

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.


United UA 2673 JAX 06:24 → EWR JetBlue B6 1889 EWR 11:18 → SJU Connection details →	2h 30m	8h 50m	98%	76%
American AA 709 JAX 07:00 → PHL JetBlue B6 1047 PHL 12:04 → SJU Connection details →	2h 50m	8h 56m	96%	68%
Delta DL 4959 JAX 07:05 → JFK JetBlue B6 703 JFK 12:00 → SJU Connection details →	2h 31m	8h 54m	96%	58%

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