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 5% of the time at 7 am and almost half the time at 8 pm.

Nonstops


United	IAH	SAN	3h 30m	82%	0.2%	1,696	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


United Details →	IAH 06:00 → LAX 07:29UA 2110	1h 31m Los Angeles	LAX 09:00 → SAN 10:08UA 4643 · flown by SkyWest	6h 08m	100%	87%
United Details →	IAH 08:30 → DEN 10:05UA 2816	3h 25m Denver	DEN 13:30 → SAN 14:55UA 1302	8h 25m	100%	87%
United Details →	IAH 05:15 → DEN 06:47UA 1874	56m Denver	DEN 07:43 → SAN 09:05UA 2309	5h 50m	96%	85%
United Details →	IAH 14:54 → LAX 16:27UA 1951	2h 23m Los Angeles	LAX 18:50 → SAN 19:51UA 5415 · flown by SkyWest	6h 57m	100%	84%
United Details →	IAH 10:31 → DEN 12:07UA 1409	3h 48m Denver	DEN 15:55 → SAN 17:20UA 1281	8h 49m	99%	83%
Delta Details →	IAH 05:40 → ATL 08:43DL 1069	3h 10m Atlanta	ATL 11:53 → SAN 13:21DL 540	9h 41m	99%	83%
United Details →	IAH 06:30 → DEN 08:02UA 2643	3h 13m Denver	DEN 11:15 → SAN 12:41UA 1940	8h 11m	100%	82%
United Details →	IAH 18:33 → LAX 20:10UA 2755	2h 46m Los Angeles	LAX 22:56 → SAN 23:54UA 594	7h 21m	100%	80%
Tight connection: often missed
Delta Details →	IAH 16:51 → ATL 20:13DL 2890	1h 15m Atlanta	ATL 21:28 → SAN 23:00DL 896	8h 09m	69%	51%
United Details →	IAH 09:35 → SFO 11:35UA 2358	46m San Francisco	SFO 12:21 → SAN 14:08UA 1257	6h 33m	58%	38%
American Details →	IAH 15:06 → CLT 18:51AA 1919	59m Charlotte	CLT 19:50 → SAN 21:45AA 3322	8h 39m	57%	32%

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

DEN · 56m · leaves 05:15 4%

IAD · 1h 12m · leaves 07:20 4%

SFO · 53m · leaves 05:22 5%

Afternoon and evening

DEN · 46m · leaves 18:19 48%

SFO · 50m · leaves 18:05 48%

DFW · 1h 09m · leaves 18:53 74%

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 2755 IAH 18:33 → LAX Delta DL 3746 LAX 22:40 → SAN Connection details →	2h 30m	7h 07m	97%	84%
United UA 469 IAH 09:53 → LAX Delta DL 4001 LAX 14:11 → SAN Connection details →	2h 41m	7h 18m	98%	80%
Frontier F9 3229 IAH 06:30 → DEN United UA 1940 DEN 11:15 → SAN Connection details →	3h 09m	8h 11m	97%	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