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 72% on time.

Nonstops


Alaska	SJC	SAN	1h 30m	75%	1.4%	1,812	Flying now
Southwest	SJC	SAN	1h 25m	70%	0.9%	3,740	Flying now
Spirit	SJC	SAN	–	43%few flights	0.0%	7	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.


Delta Details →	SJC 18:12 → LAX 19:37DL 1438	3h 03m Los Angeles	LAX 22:40 → SAN 23:40DL 3746 · flown by SkyWest	5h 28m	100%	85%
United Details →	SJC 08:45 → DEN 12:23UA 586	1h 07m Denver	DEN 13:30 → SAN 14:55UA 1302	6h 10m	98%	85%
Alaska Details →	SJC 08:00 → PDX 09:44AS 679	1h 02m Portland	PDX 10:46 → SAN 13:27AS 1394	5h 27m	100%	84%
Delta Details →	SJC 17:01 → SLC 19:57DL 1260	2h 58m Salt Lake City	SLC 22:55 → SAN 23:50DL 1202	6h 52m	99%	81%
Delta Details →	SJC 14:59 → LAX 16:27DL 3842 · flown by SkyWest	1h 48m Los Angeles	LAX 18:15 → SAN 19:16DL 4087 · flown by SkyWest	4h 17m	97%	80%
Delta Details →	SJC 09:55 → LAX 11:20DL 4451 · flown by SkyWest	2h 51m Los Angeles	LAX 14:11 → SAN 15:11DL 4001 · flown by SkyWest	5h 16m	98%	80%
Delta Details →	SJC 06:00 → SLC 08:55DL 1314	2h 20m Salt Lake City	SLC 11:15 → SAN 12:17DL 1296	6h 17m	98%	80%
Delta Details →	SJC 11:29 → SEA 13:59DL 3736 · flown by SkyWest	1h 26m Seattle	SEA 15:25 → SAN 18:13DL 2613	6h 44m	96%	80%
Tight connection: often missed
Alaska Details →	SJC 12:03 → PDX 13:48AS 2188 · flown by Horizon	1h 07m Portland	PDX 14:55 → SAN 17:29AS 1312	5h 26m	75%	56%
Southwest Details →	SJC 19:00 → PHX 20:55WN 3696	1h 00m Phoenix	PHX 21:55 → SAN 23:05WN 3426	4h 07m	56%	29%
Alaska Details →	SJC 08:20 → SEA 10:31AS 1426	55m Seattle	SEA 11:26 → SAN 14:18AS 1346	5h 58m	35%	19%

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 02m · leaves 08:00 0%

LAS · 1h 05m · leaves 06:00 0%

SEA · 55m · leaves 08:20 65%

Afternoon and evening

SLC · 48m · leaves 19:10 21%

PHX · 1h 00m · leaves 19:00 44%

DEN · 1h 00m · leaves 17:05 53%

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 3693 SJC 06:30 → PDX Alaska AS 1394 PDX 10:46 → SAN Connection details →	2h 28m	6h 57m	100%	84%
Delta DL 3842 SJC 14:59 → LAX United UA 5415 LAX 18:50 → SAN Connection details →	2h 23m	4h 52m	97%	81%
Southwest WN 4877 SJC 10:25 → LAX Delta DL 4001 LAX 14:11 → SAN Connection details →	2h 26m	4h 46m	96%	79%

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