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

No clear winner: airlines and hours on this route all land within a few points of 2 in 3 on time.

Nonstops


Alaska	OAK	SAN	1h 36m	70%	2.0%	407	Flying now
Southwest	OAK	SAN	1h 30m	66%	0.9%	2,906	Flying now
Spirit	OAK	SAN	1h 44m	79%few flights	0.0%	38	Not 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. Layovers up to 4 hours. Pick a connection for the details.


Alaska Details →	OAK 07:52 → PDX 09:29AS 2298 · flown by Horizon	1h 17m Portland	PDX 10:46 → SAN 13:27AS 1394	5h 35m	98%	82%
Delta Details →	OAK 17:05 → SLC 20:00DL 3903 · flown by SkyWest	2h 55m Salt Lake City	SLC 22:55 → SAN 23:50DL 1202	6h 48m	99%	82%
Delta Details →	OAK 06:00 → SLC 08:55DL 4061 · flown by SkyWest	2h 20m Salt Lake City	SLC 11:15 → SAN 12:17DL 1296	6h 17m	98%	82%
Delta Details →	OAK 12:33 → SLC 15:29DL 4134 · flown by SkyWest	1h 41m Salt Lake City	SLC 17:10 → SAN 18:06DL 1252	5h 33m	97%	81%
Alaska Details →	OAK 12:01 → PDX 13:44AS 3045 · flown by SkyWest	1h 11m Portland	PDX 14:55 → SAN 17:29AS 1312	5h 28m	98%	75%
Southwest Details →	OAK 05:45 → DEN 09:15WN 3041	1h 17m Denver	DEN 10:32 → SAN 12:00WN 1700	6h 12m	90%	72%
Southwest Details →	OAK 05:10 → PHX 07:05WN 3066	2h 10m Phoenix	PHX 09:15 → SAN 10:35WN 1677	5h 23m	98%	70%
Alaska Details →	OAK 10:22 → SEA 12:26AS 705	1h 57m Seattle	SEA 14:23 → SAN 17:17AS 1432	6h 55m	98%	66%
Tight connection: often missed
Alaska Details →	OAK 14:55 → SEA 17:00AS 1464	53m Seattle	SEA 17:53 → SAN 20:49AS 1388	5h 54m	49%	22%
Southwest Details →	OAK 14:55 → DEN 18:20WN 3044	55m Denver	DEN 19:15 → SAN 20:40WN 1703	5h 45m	21%	4%

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 · 1h 10m · leaves 08:20 0%

LAS · 1h 10m · leaves 09:00 0%

PDX · 1h 17m · leaves 07:52 2%

Afternoon and evening

SEA · 53m · leaves 14:55 51%

DEN · 55m · leaves 14:55 79%

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 3042 OAK 08:20 → DEN United UA 1302 DEN 13:30 → SAN Connection details →	1h 45m	6h 35m	100%	87%
Southwest WN 4978 OAK 13:20 → LAX Delta DL 4087 LAX 18:15 → SAN Connection details →	3h 30m	5h 56m	100%	83%
Southwest WN 4198 OAK 09:30 → SLC Alaska AS 3123 SLC 14:39 → SAN Connection details →	2h 24m	6h 16m	100%	82%

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