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 82% on time.

Nonstops


Delta	SEA	SJC	2h 20m	87%	0.2%	1,579	Flying now
Alaska	SEA	SJC	2h 14m	82%	1.0%	1,936	Flying now
Southwest	SEA	SJC	2h 15m	73%	0.2%	905	Flying now
American	SEA	SJC	–	100%few flights	0.0%	4	Not flying now
United	SEA	SJC	–	100%few flights	0.0%	1	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach San Jose on time. Total trip = scheduled departure to arrival, layover included. Layovers up to 4 hours. Pick a connection for the details.


Alaska Details →	SEA 10:14 → PDX 11:21AS 3090 · flown by SkyWest	3h 09m Portland	PDX 14:30 → SJC 16:25AS 3210 · flown by SkyWest	6h 11m	100%	94%
Southwest Details →	SEA 07:30 → LAS 10:05WN 2175	2h 05m Las Vegas	LAS 12:10 → SJC 13:45WN 1242	6h 15m	100%	90%
Delta Details →	SEA 10:05 → LAX 12:54DL 2769	1h 38m Los Angeles	LAX 14:32 → SJC 15:46DL 3822 · flown by SkyWest	5h 41m	96%	90%
Delta Details →	SEA 07:15 → LAX 10:05DL 1628	2h 52m Los Angeles	LAX 12:57 → SJC 14:19DL 3842 · flown by SkyWest	7h 04m	99%	90%
Delta Details →	SEA 05:30 → SLC 08:30DL 1128	3h 10m Salt Lake City	SLC 11:40 → SJC 12:38DL 1254	7h 08m	99%	89%
Delta Details →	SEA 09:30 → SLC 12:38DL 1016	2h 33m Salt Lake City	SLC 15:11 → SJC 16:07DL 1260	6h 37m	99%	88%
Alaska Details →	SEA 08:45 → PDX 09:49AS 3132 · flown by SkyWest	1h 56m Portland	PDX 11:45 → SJC 13:35AS 1632	4h 50m	98%	87%
Delta Details →	SEA 12:35 → LAX 15:26DL 2914	2h 50m Los Angeles	LAX 18:16 → SJC 19:32DL 3883 · flown by SkyWest	7h 00m	99%	86%
Tight connection: often missed
Southwest Details →	SEA 17:35 → LAS 20:15WN 2267	1h 40m Las Vegas	LAS 21:55 → SJC 23:25WN 660	5h 52m	69%	41%

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

SLC · 1h 17m · leaves 07:15 4%

PHX · 46m · leaves 06:16 18%

DEN · 55m · leaves 07:50 22%

Afternoon and evening

PDX · 1h 13m · leaves 19:22 15%

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.


Delta DL 3818 SEA 09:30 → PDX Alaska AS 3210 PDX 14:30 → SJC Connection details →	3h 51m	6h 55m	100%	96%
Alaska AS 360 SEA 08:48 → SLC Delta DL 1260 SLC 15:11 → SJC Connection details →	3h 16m	7h 19m	100%	90%
Alaska AS 699 SEA 06:40 → SNA Southwest WN 3861 SNA 12:00 → SJC Connection details →	2h 26m	6h 45m	99%	90%

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