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 38% of the time at 6 pm.

Nonstops


United	IAH	SFO	4h 10m	79%	0.5%	3,598	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


United Details →	IAH 12:33 → LAX 14:06UA 2460	3h 04m Los Angeles	LAX 17:10 → SFO 18:38UA 233	8h 05m	99%	82%
United Details →	IAH 08:30 → DEN 10:05UA 2816	3h 20m Denver	DEN 13:25 → SFO 15:09UA 1812	8h 39m	100%	76%
United Details →	IAH 12:00 → SAN 13:21UA 2399	2h 48m San Diego	SAN 16:09 → SFO 17:49UA 2117	7h 49m	99%	75%
United Details →	IAH 07:20 → IAD 11:28UA 1549	1h 12m Dulles	IAD 12:40 → SFO 15:27UA 1434	10h 07m	96%	74%
United Details →	IAH 16:35 → IAD 20:46UA 2388	1h 35m Dulles	IAD 22:21 → SFO 01:15 +1UA 367	10h 40m	89%	74%
United Details →	IAH 09:30 → SAN 10:51UA 2491	2h 48m San Diego	SAN 13:39 → SFO 15:19UA 1763	7h 49m	99%	73%
United Details →	IAH 08:05 → ORD 11:01UA 1617	3h 29m Chicago	ORD 14:30 → SFO 17:19UA 1577	11h 14m	100%	72%
United Details →	IAH 10:31 → DEN 12:07UA 1409	3h 40m Denver	DEN 15:47 → SFO 17:30UA 2633	8h 59m	99%	71%
Tight connection: often missed
United Details →	IAH 18:19 → DEN 20:14UA 1654	56m Denver	DEN 21:10 → SFO 22:56UA 2123	6h 37m	63%	38%
United Details →	IAH 07:20 → DEN 08:52UA 1575	51m Denver	DEN 09:43 → SFO 11:25UA 1506	6h 05m	74%	35%
American Details →	IAH 13:36 → ORD 16:35AA 1915	1h 24m Chicago	ORD 17:59 → SFO 20:46AA 1620	9h 10m	67%	22%

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

EWR · 1h 14m · leaves 06:01 4%

ORD · 1h 20m · leaves 06:10 4%

IAD · 1h 12m · leaves 07:20 4%

Afternoon and evening

ATL · 46m · leaves 18:34 40%

DFW · 1h 09m · leaves 18:53 74%

PHL · 46m · leaves 12:21 75%

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 American AA 6510 LAX 22:32 → SFO Connection details →	2h 22m	7h 26m	95%	77%
United UA 2491 IAH 09:30 → SAN Alaska AS 3352 SAN 13:30 → SFO Connection details →	2h 39m	7h 44m	98%	72%
United UA 2654 IAH 08:00 → SEA Delta DL 3707 SEA 14:30 → SFO Connection details →	3h 43m	10h 50m	100%	70%

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