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 78% on time.

Nonstops


Alaska	OAK	SEA	2h 06m	80%	1.4%	1,256	Flying now
Southwest	OAK	SEA	2h 10m	76%	0.3%	1,105	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Delta Details →	OAK 17:05 → SLC 20:00DL 3903 · flown by SkyWest	2h 45m Salt Lake City	SLC 22:45 → SEA 23:59DL 2998	6h 54m	99%	91%
Alaska Details →	OAK 17:35 → PDX 19:12AS 2304 · flown by Horizon	2h 18m Portland	PDX 21:30 → SEA 22:27AS 2421 · flown by Horizon	4h 52m	100%	90%
Delta Details →	OAK 06:00 → SLC 08:55DL 4061 · flown by SkyWest	2h 40m Salt Lake City	SLC 11:35 → SEA 12:52DL 2995	6h 52m	99%	88%
Alaska Details →	OAK 07:52 → PDX 09:29AS 2298 · flown by Horizon	2h 34m Portland	PDX 12:03 → SEA 13:03AS 3078 · flown by SkyWest	5h 11m	98%	83%
Alaska Details →	OAK 12:01 → PDX 13:44AS 3045 · flown by SkyWest	1h 46m Portland	PDX 15:30 → SEA 16:30AS 3408 · flown by SkyWest	4h 29m	100%	79%
Delta Details →	OAK 12:33 → SLC 15:29DL 4134 · flown by SkyWest	1h 51m Salt Lake City	SLC 17:20 → SEA 18:36DL 871	6h 03m	98%	79%
Southwest Details →	OAK 05:00 → LAS 06:30WN 2325	1h 10m Las Vegas	LAS 07:40 → SEA 10:25WN 739	5h 25m	98%	73%
Southwest Details →	OAK 05:10 → PHX 07:05WN 3066	1h 30m Phoenix	PHX 08:35 → SEA 11:40WN 3330	6h 30m	98%	71%
Tight connection: often missed
Alaska Details →	OAK 14:50 → SAN 16:26AS 3311 · flown by SkyWest	1h 09m San Diego	SAN 17:35 → SEA 20:35AS 417	5h 45m	71%	49%
Southwest Details →	OAK 14:55 → DEN 18:20WN 3044	1h 30m Denver	DEN 19:50 → SEA 21:50WN 1716	6h 55m	65%	21%
Southwest Details →	OAK 19:50 → PHX 21:50WN 3070	55m Phoenix	PHX 22:45 → SEA 01:42 +1WN 3429	5h 53m	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 06m · leaves 07:52 2%

LAS · 1h 10m · leaves 05:00 3%

DEN · 50m · leaves 05:45 22%

Afternoon and evening

SAN · 1h 09m · leaves 14:50 29%

PHX · 55m · leaves 19:50 65%

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.


Alaska AS 2298 OAK 07:52 → PDX Delta DL 3818 PDX 11:20 → SEA Connection details →	1h 51m	4h 44m	98%	89%
Southwest WN 2374 OAK 09:00 → LAS Delta DL 2905 LAS 13:35 → SEA Connection details →	3h 05m	7h 23m	100%	89%
Southwest WN 3036 OAK 09:15 → BUR Alaska AS 580 BUR 13:21 → SEA Connection details →	2h 56m	6h 48m	100%	88%

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