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

Connect in the morning. The same one-hour layover misses 4% of the time at 8 am and 43% of the time at 6 pm.

Nonstops


United	SFO	SEA	2h 18m	77%	0.5%	2,330	Flying now
Delta	SFO	SEA	2h 20m	76%	1.4%	1,748	Flying now
Alaska	SFO	SEA	2h 15m	71%	1.3%	2,719	Flying now
Southwest	SFO	SEA	–	100%few flights	0.0%	3	Not 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.


Alaska Details →	SFO 06:00 → LAX 07:32AS 1620	2h 28m Los Angeles	LAX 10:00 → SEA 12:48AS 798	6h 48m	100%	88%
Delta Details →	SFO 07:00 → LAX 08:30DL 1598	1h 10m Los Angeles	LAX 09:40 → SEA 12:30DL 1714	5h 34m	96%	88%
Alaska Details →	SFO 16:30 → LAX 18:06AS 1523	3h 06m Los Angeles	LAX 21:12 → SEA 23:59AS 495	7h 29m	95%	87%
Delta Details →	SFO 05:50 → SLC 08:42DL 1331	2h 53m Salt Lake City	SLC 11:35 → SEA 12:52DL 2995	7h 02m	99%	87%
Delta Details →	SFO 17:07 → SLC 20:02DL 1088	2h 43m Salt Lake City	SLC 22:45 → SEA 23:59DL 2998	6h 52m	96%	87%
Alaska Details →	SFO 06:35 → SNA 08:15AS 3244 · flown by SkyWest	2h 13m Santa Ana	SNA 10:28 → SEA 13:17AS 471	6h 42m	98%	86%
Alaska Details →	SFO 13:51 → LAX 15:22AS 1604	2h 47m Los Angeles	LAX 18:09 → SEA 20:56AS 1301	7h 05m	98%	84%
Alaska Details →	SFO 07:20 → PDX 09:02AS 1410	3h 01m Portland	PDX 12:03 → SEA 13:03AS 3078 · flown by SkyWest	5h 43m	100%	84%
Tight connection: often missed
United Details →	SFO 14:20 → DEN 18:11UA 1596	59m Denver	DEN 19:10 → SEA 21:10UA 360	6h 50m	70%	48%
Alaska Details →	SFO 16:30 → LAX 18:06AS 1523	1h 03m Los Angeles	LAX 19:09 → SEA 21:58AS 1368	5h 28m	63%	45%
Alaska Details →	SFO 10:15 → LAX 11:44AS 1602	1h 03m Los Angeles	LAX 12:47 → SEA 15:33AS 1305	5h 18m	32%	24%

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

LAX · 1h 10m · leaves 07:00 4%

PHX · 1h 05m · leaves 05:30 6%

LAS · 1h 05m · leaves 05:00 7%

Afternoon and evening

SLC · 1h 05m · leaves 13:20 27%

DEN · 59m · leaves 14:20 30%

LAX · 1h 03m · leaves 16:04 49%

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 2222 SFO 06:05 → LAX Delta DL 1714 LAX 09:40 → SEA Connection details →	2h 05m	6h 29m	100%	92%
United UA 4717 SFO 09:15 → PSC Delta DL 3891 PSC 15:25 → SEA Connection details →	3h 58m	7h 25m	100%	90%
United UA 1301 SFO 10:15 → PDX Delta DL 4062 PDX 15:26 → SEA Connection details →	3h 18m	6h 26m	100%	89%

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