Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

No clear winner: United’s FAT → SFO flights land within a few points of 2 in 3 on time whatever the hour.

Nonstops


United	FAT	SFO	1h 04m	66%	1.3%	1,250	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. Layovers up to 4 hours. Pick a connection for the details.


United Details →	FAT 13:58 → LAX 15:23UA 5307 · flown by SkyWest	1h 47m Los Angeles	LAX 17:10 → SFO 18:38UA 233	4h 40m	96%	80%
Alaska Details →	FAT 08:46 → SAN 10:12AS 3409 · flown by SkyWest	3h 18m San Diego	SAN 13:30 → SFO 15:14AS 3352 · flown by SkyWest	6h 28m	100%	72%
Alaska Details →	FAT 07:00 → SEA 09:22AS 3219 · flown by SkyWest	2h 20m Seattle	SEA 11:42 → SFO 14:04AS 655	7h 04m	100%	70%
United Details →	FAT 09:00 → DEN 12:34UA 5787 · flown by SkyWest	51m Denver	DEN 13:25 → SFO 15:09UA 1812	6h 09m	87%	66%
Delta Details →	FAT 17:13 → SLC 20:00DL 3777 · flown by SkyWest	2h 50m Salt Lake City	SLC 22:50 → SFO 23:52DL 1091	6h 43m	99%	65%
Delta Details →	FAT 06:09 → SLC 08:55DL 4138 · flown by SkyWest	2h 05m Salt Lake City	SLC 11:00 → SFO 12:08DL 902	5h 59m	98%	64%
Delta Details →	FAT 09:48 → SLC 12:34DL 3786 · flown by SkyWest	2h 36m Salt Lake City	SLC 15:10 → SFO 16:12DL 1088	6h 27m	100%	64%
United Details →	FAT 06:00 → LAX 07:12UA 1756	1h 58m Los Angeles	LAX 09:10 → SFO 10:45UA 520	4h 45m	97%	63%
Tight connection: often missed
Alaska Details →	FAT 08:46 → SAN 10:12AS 3409 · flown by SkyWest	52m San Diego	SAN 11:04 → SFO 12:51AS 3347 · flown by SkyWest	4h 05m	35%	21%
Southwest Details →	FAT 17:35 → SAN 18:50WN 1845	1h 20m San Diego	SAN 20:10 → SFO 21:55WN 4772	4h 15m	43%	5%

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

PDX · 1h 15m · leaves 07:30 5%

SAN · 52m · leaves 08:46 65%

Afternoon and evening

SEA · 53m · leaves 13:27 17%

LAX · 51m · leaves 13:58 18%

SAN · 1h 20m · leaves 17:35 57%

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 5759 FAT 18:09 → LAX American AA 6510 LAX 22:32 → SFO Connection details →	3h 00m	5h 50m	96%	78%
Alaska AS 3409 FAT 08:46 → SAN United UA 1763 SAN 13:39 → SFO Connection details →	3h 27m	6h 33m	97%	70%
Southwest WN 1844 FAT 06:25 → SAN United UA 2309 SAN 11:01 → SFO Connection details →	3h 21m	6h 22m	96%	66%

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