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 88% on time.

Nonstops (seasonal or thin)


United	SJU	IAH	4h 56m	89%	0.5%	872	Flying now
Spirit	SJU	IAH	5h 17m	68%	1.7%	58	Not flying now

Best connections, any airlines

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Houston on time. Total trip = scheduled departure to arrival, layover included (Houston is 1 h behind San Juan). Layovers up to 4 hours. Pick a connection for the details.


Southwest + Unitedtwo ticketsDetails →	SJU 05:00 → MCO 08:00WN 3721	3h 57m Orlando	MCO 11:57 → IAH 13:29UA 1493	9h 29m	100%	95%
JetBlue + Unitedtwo ticketsDetails →	SJU 06:00 → TPA 08:59B6 452	2h 56m Tampa	TPA 11:55 → IAH 13:22UA 2421	8h 22m	100%	88%
American + Unitedtwo ticketsDetails →	SJU 00:59 → ORD 05:04AA 2592	2h 31m Chicago	ORD 07:35 → IAH 10:36UA 1231	10h 37m	97%	86%
JetBlue + Unitedtwo ticketsDetails →	SJU 02:20 → MCO 05:19B6 234	3h 51m Orlando	MCO 09:10 → IAH 10:45UA 2611	9h 25m	99%	86%
United Details →	SJU 01:00 → EWR 05:10UA 2219	1h 55m Newark	EWR 07:05 → IAH 09:50UA 2438	9h 50m	93%	86%
American + Unitedtwo ticketsDetails →	SJU 06:00 → MIA 08:55AA 2817	3h 34m Miami	MIA 12:29 → IAH 14:23UA 470	9h 23m	99%	86%
JetBlue + Unitedtwo ticketsDetails →	SJU 06:00 → BOS 10:05B6 562	3h 32m Boston	BOS 13:37 → IAH 16:57UA 1976	11h 57m	97%	85%
Delta + Unitedtwo ticketsDetails →	SJU 06:00 → ATL 09:50DL 1879	1h 47m Atlanta	ATL 11:37 → IAH 12:47UA 425	7h 47m	97%	85%
Tight connection: often missed
Frontier Details →	SJU 03:10 → MCO 06:10F9 1823	50m Orlando	MCO 07:00 → IAH 08:47F9 1417	6h 37m	73%	62%

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

ATL · 1h 10m · leaves 07:30 3%

ORD · 47m · leaves 07:40 10%

CLT · 1h 15m · leaves 07:25 11%

Afternoon and evening

CLT · 1h 06m · leaves 15:40 12%

PHL · 1h 17m · leaves 14:25 15%

ATL · 50m · leaves 17:56 18%

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.

The table above includes two-ticket connections (marked “two tickets”), held to the 90-minute minimum. One ticket only →

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