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 70-minute layover misses 4% of the time at 8 am and 38% of the time at 8 pm.

Nonstops


United	SFO	IAH	3h 55m	85%	0.3%	3,598	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


United Details →	SFO 19:45 → LAX 21:29UA 298	3h 22m Los Angeles	LAX 00:51 → IAH 06:12 +1UA 491	8h 27m	100%	92%
United Details →	SFO 21:30 → DTW 05:20UA 234	55m Detroit	DTW 06:15 → IAH 08:11 +1UA 1229	8h 41m	94%	92%
United Details →	SFO 13:55 → LAX 15:35UA 2610	3h 46m Los Angeles	LAX 19:21 → IAH 00:50 +1UA 387	8h 55m	100%	91%
United Details →	SFO 06:00 → LAS 07:46UA 582	2h 39m Las Vegas	LAS 10:25 → IAH 15:40UA 1711	7h 40m	100%	91%
United Details →	SFO 21:13 → TPA 05:38UA 649	1h 37m Tampa	TPA 07:15 → IAH 08:42 +1UA 2491	9h 29m	97%	90%
United Details →	SFO 06:38 → SAN 08:22UA 1980	1h 51m San Diego	SAN 10:13 → IAH 15:40UA 2165	7h 02m	100%	89%
United Details →	SFO 07:00 → SEA 09:22UA 1708	2h 33m Seattle	SEA 11:55 → IAH 18:35UA 2293	9h 35m	98%	88%
United Details →	SFO 22:59 → SEA 01:29UA 5579 · flown by SkyWest	3h 31m Seattle	SEA 05:00 → IAH 11:21 +1UA 2748	10h 22m	100%	88%
Tight connection: often missed
Delta Details →	SFO 14:00 → ATL 21:49DL 531	55m Atlanta	ATL 22:44 → IAH 23:56DL 1601	7h 56m	74%	55%
United Details →	SFO 12:00 → ORD 18:35UA 2317	1h 27m Chicago	ORD 20:02 → IAH 22:59UA 2813	8h 59m	69%	36%
American Details →	SFO 11:24 → DFW 17:14AA 1849	1h 22m Dallas-Fort Worth	DFW 18:36 → IAH 19:54AA 1392	6h 30m	68%	33%

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

LAX · 1h 10m · leaves 07:00 4%

MIA · 1h 09m · leaves 22:54 9%

BOS · 1h 04m · leaves 21:25 10%

Afternoon and evening

PDX · 1h 11m · leaves 20:50 36%

DFW · 1h 11m · leaves 14:03 38%

PHX · 48m · leaves 15:52 63%

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 4231 SFO 05:00 → LAS United UA 1711 LAS 10:25 → IAH Connection details →	3h 50m	8h 40m	100%	91%
Alaska AS 620 SFO 06:03 → SEA United UA 2293 SEA 11:55 → IAH Connection details →	3h 42m	10h 32m	100%	90%
Frontier F9 3440 SFO 21:39 → DEN United UA 320 DEN 05:00 → IAH Connection details →	3h 26m	8h 53m	92%	89%

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