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

No clear winner: Alaska’s ACV → SEA flights land within a few points of 3 in 4 on time whatever the hour.

Nonstops (seasonal or thin)


Alaska	ACV	SEA	1h 47m	74%	3.5%	115	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.


United Details →	ACV 07:15 → LAX 09:19UA 4756 · flown by SkyWest	2h 24m Los Angeles	LAX 11:43 → SEA 14:36UA 325	7h 21m	100%	83%
United Details →	ACV 15:47 → LAX 17:51UA 5506 · flown by SkyWest	1h 16m Los Angeles	LAX 19:07 → SEA 22:00UA 684	6h 13m	93%	78%
United Details →	ACV 14:05 → SFO 15:22UA 4655 · flown by SkyWest	3h 06m San Francisco	SFO 18:28 → SEA 20:53UA 1577	6h 48m	95%	65%
United Details →	ACV 12:30 → DEN 16:22UA 5966 · flown by SkyWest	2h 48m Denver	DEN 19:10 → SEA 21:10UA 360	8h 40m	94%	63%
United Details →	ACV 18:44 → SFO 20:07UA 5305 · flown by SkyWest	2h 52m San Francisco	SFO 22:59 → SEA 01:29 +1UA 5579 · flown by SkyWest	6h 45m	94%	63%
United Details →	ACV 07:40 → SFO 08:56UA 4632 · flown by SkyWest	3h 14m San Francisco	SFO 12:10 → SEA 14:30UA 2744	6h 50m	91%	60%
United Details →	ACV 06:00 → SFO 07:09UA 5313 · flown by SkyWest	3h 06m San Francisco	SFO 10:15 → SEA 12:34UA 2192	6h 34m	94%	43%
Tight connection: often missed
United Details →	ACV 14:05 → SFO 15:22UA 4655 · flown by SkyWest	1h 05m San Francisco	SFO 16:27 → SEA 18:47UA 2279	4h 42m	62%	47%
United Details →	ACV 07:40 → SFO 08:56UA 4632 · flown by SkyWest	1h 19m San Francisco	SFO 10:15 → SEA 12:34UA 2192	4h 54m	36%	16%
United Details →	ACV 18:44 → SFO 20:07UA 5305 · flown by SkyWest	47m San Francisco	SFO 20:54 → SEA 23:19UA 1007	4h 35m	16%	10%

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

SFO · 1h 19m · leaves 07:40 64%

Afternoon and evening

SFO · 47m · leaves 18:44 84%

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.


United UA 4756 ACV 07:15 → LAX Delta DL 1045 LAX 11:59 → SEA Connection details →	2h 40m	7h 39m	100%	82%
United UA 5506 ACV 15:47 → LAX Alaska AS 614 LAX 20:09 → SEA Connection details →	2h 18m	7h 11m	93%	81%
United UA 4655 ACV 14:05 → SFO Alaska AS 758 SFO 17:38 → SEA Connection details →	2h 16m	5h 42m	76%	54%

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