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 3% of the time at 12 pm and 43% of the time at 7 pm.

Nonstops (seasonal or thin)


United	SJU	DEN	6h 35m	87%	0.3%	333	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Denver on time. Total trip = scheduled departure to arrival, layover included (Denver is 2 h behind San Juan). Layovers up to 4 hours. Pick a connection for the details.


United Details →	SJU 02:05 → IAH 06:01UA 2495	2h 29m Houston	IAH 08:30 → DEN 10:05UA 2816	10h 00m	99%	96%
Southwest Details →	SJU 05:00 → MCO 08:00WN 3721	1h 45m Orlando	MCO 09:45 → DEN 11:35WN 2630	8h 35m	100%	92%
United Details →	SJU 07:20 → IAD 11:21UA 2022	1h 27m Dulles	IAD 12:48 → DEN 14:42UA 1587	9h 22m	99%	90%
United Details →	SJU 14:55 → IAH 18:51UA 668	3h 19m Houston	IAH 22:10 → DEN 23:57UA 1066	11h 02m	99%	88%
Delta Details →	SJU 06:00 → ATL 09:50DL 1879	3h 00m Atlanta	ATL 12:50 → DEN 14:04DL 957	10h 04m	100%	88%
United Details →	SJU 07:00 → IAH 10:53UA 1644	1h 40m Houston	IAH 12:33 → DEN 14:17UA 2168	9h 17m	99%	85%
United Details →	SJU 07:40 → ORD 11:53UA 2089	1h 03m Chicago	ORD 12:56 → DEN 14:46UA 1150	9h 06m	97%	84%
United Details →	SJU 01:00 → EWR 05:10UA 2219	1h 20m Newark	EWR 06:30 → DEN 08:45UA 670	9h 45m	89%	84%
Tight connection: often missed
American Details →	SJU 16:38 → MIA 19:34AA 2581	56m Miami	MIA 20:30 → DEN 22:54AA 1737	8h 15m	68%	45%
JetBlue Details →	SJU 15:24 → JFK 19:26B6 1004	50m New York	JFK 20:16 → DEN 22:59B6 97	9h 34m	57%	30%

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

ORD · 1h 03m · leaves 07:40 3%

IAH · 1h 19m · leaves 02:05 5%

BOS · 1h 15m · leaves 06:00 11%

Afternoon and evening

EWR · 1h 10m · leaves 13:25 25%

MIA · 56m · leaves 16:38 32%

JFK · 50m · leaves 15:24 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.


Southwest WN 3722 SJU 06:25 → MCO United UA 1520 MCO 12:50 → DEN Connection details →	3h 20m	10h 26m	100%	91%
JetBlue B6 452 SJU 06:00 → TPA United UA 645 TPA 12:45 → DEN Connection details →	3h 46m	10h 47m	100%	90%
JetBlue B6 234 SJU 02:20 → MCO United UA 1714 MCO 08:00 → DEN Connection details →	2h 41m	9h 42m	96%	90%

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