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 6% of the time at 9 am and 28% of the time at 4 pm.

Nonstops (seasonal or thin)


United	IAH	SJU	4h 35m	85%	0.3%	872	Flying now
Spirit	IAH	SJU	4h 17m	57%	3.6%	56	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 (San Juan is 1 h ahead of Houston). Layovers up to 4 hours. Pick a connection for the details.


American Details →	IAH 05:10 → MIA 08:51AA 1047	2h 26m Miami	MIA 11:17 → SJU 14:12AA 2584	8h 02m	99%	91%
United Details →	IAH 05:15 → DEN 06:47UA 1874	2h 56m Denver	DEN 09:43 → SJU 17:38UA 1339	11h 23m	99%	82%
United Details →	IAH 08:05 → ORD 11:01UA 1617	3h 37m Chicago	ORD 14:38 → SJU 20:34UA 695	11h 29m	100%	79%
Delta Details →	IAH 07:02 → ATL 10:05DL 1315	3h 01m Atlanta	ATL 13:06 → SJU 16:46DL 1946	8h 44m	98%	79%
JetBlue Details →	IAH 13:00 → FLL 16:23B6 2780	2h 52m Fort Lauderdale	FLL 19:15 → SJU 21:53B6 553	7h 57m	93%	78%
American Details →	IAH 06:01 → CLT 09:43AA 2011	1h 20m Charlotte	CLT 11:03 → SJU 14:50AA 783	7h 49m	94%	78%
American Details →	IAH 07:35 → MIA 11:20AA 1347	1h 43m Miami	MIA 13:03 → SJU 15:47AA 2581	7h 12m	94%	76%
United Details →	IAH 05:04 → ORD 07:59UA 1044	50m Chicago	ORD 08:49 → SJU 14:44UA 1996	8h 40m	90%	73%
Tight connection: often missed
United Details →	IAH 07:20 → DEN 08:52UA 1575	51m Denver	DEN 09:43 → SJU 17:38UA 1339	9h 18m	74%	60%
United Details →	IAH 12:13 → IAD 16:30UA 2366	54m Dulles	IAD 17:24 → SJU 21:24UA 2025	8h 11m	72%	52%
American Details →	IAH 13:36 → ORD 16:35AA 1915	1h 25m Chicago	ORD 18:00 → SJU 23:58AA 3192	9h 22m	68%	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 · 1h 20m · leaves 06:01 6%

ATL · 1h 02m · leaves 05:40 6%

ORD · 50m · leaves 05:04 10%

Afternoon and evening

EWR · 1h 15m · leaves 13:46 18%

ATL · 51m · leaves 14:43 25%

IAD · 54m · leaves 12:13 28%

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 1706 IAH 12:06 → FLL JetBlue B6 553 FLL 19:15 → SJU Connection details →	3h 22m	8h 51m	100%	84%
United UA 2310 IAH 09:30 → MCO Southwest WN 2703 MCO 15:25 → SJU Connection details →	2h 25m	7h 55m	97%	80%
United UA 1030 IAH 07:20 → ATL Delta DL 1946 ATL 13:06 → SJU Connection details →	2h 27m	8h 26m	98%	79%

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