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 ACV → SFO flights land within a few points of 3 in 5 on time whatever the hour.

Nonstops


United	ACV	SFO	1h 19m	61%	2.9%	1,292	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 →	ACV 15:47 → LAX 17:51UA 5506 · flown by SkyWest	3h 43m Los Angeles	LAX 21:34 → SFO 23:02UA 2056	7h 15m	100%	61%
United Details →	ACV 12:30 → DEN 16:22UA 5966 · flown by SkyWest	1h 32m Denver	DEN 17:54 → SFO 19:40UA 1007	7h 10m	85%	56%
United Details →	ACV 07:15 → LAX 09:19UA 4756 · flown by SkyWest	1h 36m Los Angeles	LAX 10:55 → SFO 12:30UA 1791	5h 15m	100%	55%
Alaska Details →	ACV 14:50 → SEA 16:30AS 3345 · flown by SkyWest	2h 06m Seattle	SEA 18:36 → SFO 20:48AS 619	5h 58m	92%	25%

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.

Afternoon and evening

SEA · 1h 06m · leaves 14:50 20%

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 4756 ACV 07:15 → LAX Delta DL 2725 LAX 12:00 → SFO Connection details →	2h 41m	6h 13m	100%	63%
United UA 5506 ACV 15:47 → LAX American AA 6260 LAX 20:35 → SFO Connection details →	2h 44m	6h 24m	93%	59%
United UA 5966 ACV 12:30 → DEN Frontier F9 1093 DEN 18:58 → SFO Connection details →	2h 36m	8h 24m	88%	54%

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