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 90-minute layover misses 6% of the time at 8 am and 1 time in 3 at 10 pm.

Nonstops


Delta	ATL	SJU	3h 40m	77%	0.9%	1,627	Flying now
Frontier	ATL	SJU	3h 50m	56%	1.8%	379	Flying now
Spirit	ATL	SJU	3h 28m	36%	6.5%	93	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.


United Details →	ATL 11:37 → IAH 12:47UA 425	2h 16m Houston	IAH 15:03 → SJU 20:38UA 701	9h 01m	97%	89%
American Details →	ATL 07:00 → MIA 09:05AA 3190	2h 12m Miami	MIA 11:17 → SJU 14:12AA 2584	7h 12m	96%	88%
Southwest Details →	ATL 07:40 → MCO 09:10WN 212	3h 00m Orlando	MCO 12:10 → SJU 15:05WN 1465	7h 25m	98%	86%
United Details →	ATL 18:57 → IAH 20:15UA 2376	3h 41m Houston	IAH 23:56 → SJU 05:29 +1UA 1497	10h 32m	100%	85%
United Details →	ATL 05:30 → IAD 07:20UA 641	1h 14m Dulles	IAD 08:34 → SJU 12:34UA 2021	7h 04m	98%	82%
American Details →	ATL 05:20 → MIA 07:15AA 1135	1h 05m Miami	MIA 08:20 → SJU 11:04AA 2582	5h 44m	86%	81%
Frontier Details →	ATL 05:05 → MCO 06:40F9 1242	3h 37m Orlando	MCO 10:17 → SJU 13:16F9 2250	8h 11m	95%	80%
Delta Details →	ATL 07:44 → JFK 10:00DL 2420	2h 30m New York	JFK 12:30 → SJU 16:29DL 1961	8h 45m	98%	80%
Tight connection: often missed
United Details →	ATL 14:41 → IAD 16:35UA 1831	49m Dulles	IAD 17:24 → SJU 21:24UA 2025	6h 43m	66%	48%
Frontier Details →	ATL 20:12 → PHL 22:29F9 1102	1h 30m Philadelphia	PHL 23:59 → SJU 03:57 +1F9 1726	7h 47m	67%	37%
American Details →	ATL 20:01 → DFW 21:32AA 1379	1h 15m Dallas-Fort Worth	DFW 22:47 → SJU 04:39 +1AA 514	8h 38m	52%	23%

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

IAD · 1h 14m · leaves 05:30 2%

PHL · 1h 17m · leaves 06:00 7%

DEN · 52m · leaves 07:30 15%

Afternoon and evening

EWR · 51m · leaves 16:25 40%

DFW · 1h 15m · leaves 20:01 48%

MCO · 1h 02m · leaves 20:30 50%

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 1682 ATL 10:05 → IAH United UA 701 IAH 15:03 → SJU Connection details →	3h 45m	10h 33m	99%	89%
Delta DL 1562 ATL 23:29 → MCO JetBlue B6 1233 MCO 05:01 → SJU Connection details →	3h 56m	8h 28m	98%	86%
Delta DL 2204 ATL 07:25 → MCO Southwest WN 1465 MCO 12:10 → SJU Connection details →	3h 15m	7h 40m	98%	84%

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