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

No clear winner: United’s PSC → SFO flights land within a few points of 72% on time whatever the hour.

Nonstops (seasonal or thin)


United	PSC	SFO	2h 09m	72%	0.2%	596	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Alaska Details →	PSC 12:56 → SEA 14:02AS 2306 · flown by Horizon	2h 34m Seattle	SEA 16:36 → SFO 18:48AS 1385	5h 52m	98%	69%
Alaska Details →	PSC 10:33 → SEA 11:38AS 2171 · flown by Horizon	1h 42m Seattle	SEA 13:20 → SFO 15:31AS 680	4h 58m	98%	67%
Delta Details →	PSC 17:21 → SLC 20:10DL 3728 · flown by SkyWest	2h 40m Salt Lake City	SLC 22:50 → SFO 23:52DL 1091	6h 35m	100%	66%
Delta Details →	PSC 10:00 → SLC 12:47DL 3694 · flown by SkyWest	2h 23m Salt Lake City	SLC 15:10 → SFO 16:12DL 1088	6h 15m	99%	64%
Delta Details →	PSC 06:00 → SLC 08:38DL 1645	2h 22m Salt Lake City	SLC 11:00 → SFO 12:08DL 902	6h 08m	97%	63%
Delta Details →	PSC 15:25 → SEA 16:40DL 3891 · flown by SkyWest	1h 12m Seattle	SEA 17:52 → SFO 20:19DL 3991 · flown by SkyWest	4h 54m	94%	61%
Delta Details →	PSC 05:25 → SEA 06:39DL 3972 · flown by SkyWest	3h 06m Seattle	SEA 09:45 → SFO 12:08DL 1412	6h 43m	96%	60%
Alaska Details →	PSC 05:23 → PDX 06:18AS 3109 · flown by SkyWest	1h 01m Portland	PDX 07:19 → SFO 09:16AS 526	3h 53m	98%	58%
Tight connection: often missed
Alaska Details →	PSC 15:59 → PDX 16:50AS 2471 · flown by Horizon	46m Portland	PDX 17:36 → SFO 19:30AS 504	3h 31m	40%	23%

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 01m · leaves 05:23 2%

Afternoon and evening

SEA · 1h 12m · leaves 15:25 6%

SLC · 49m · leaves 17:21 7%

PDX · 46m · leaves 15:59 60%

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 2171 PSC 10:33 → SEA Delta DL 3707 SEA 14:30 → SFO Connection details →	2h 52m	6h 17m	99%	69%
Alaska AS 2165 PSC 06:15 → SEA United UA 1482 SEA 10:29 → SFO Connection details →	3h 09m	6h 32m	100%	69%
Alaska AS 2366 PSC 18:04 → SEA Delta DL 2635 SEA 21:45 → SFO Connection details →	2h 35m	6h 02m	97%	67%

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