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 88% on time.

Nonstops


Delta	KOA	SEA	5h 59m	91%	3.0%	365	Flying now
Alaska	KOA	SEA	5h 55m	86%	1.9%	1,057	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 (Seattle is 3 h ahead of Kailua/Kona). Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	KOA 10:00 → SMF 18:05WN 2316	3h 50m Sacramento	SMF 21:55 → SEA 23:50WN 4985	10h 50m	100%	94%
Delta Details →	KOA 21:37 → LAX 06:00DL 486	3h 40m Los Angeles	LAX 09:40 → SEA 12:30 +1DL 1714	11h 57m	100%	89%
Alaska Details →	KOA 11:15 → LAX 19:32AS 920	1h 40m Los Angeles	LAX 21:12 → SEA 23:59AS 495	9h 44m	96%	88%
United Details →	KOA 20:00 → DEN 06:49UA 1759	1h 12m Denver	DEN 08:01 → SEA 10:00 +1UA 2271	11h 00m	93%	82%
Alaska Details →	KOA 12:51 → OGG 13:28AS 1149	1h 47m Kahului	OGG 15:15 → SEA 23:59AS 244	8h 08m	98%	81%
Alaska Details →	KOA 08:00 → LIH 08:55AS 1029	3h 36m Lihue	LIH 12:31 → SEA 21:21AS 234	10h 21m	100%	78%
United Details →	KOA 07:00 → SFO 15:10UA 1321	1h 17m San Francisco	SFO 16:27 → SEA 18:47UA 2279	8h 47m	100%	76%
Southwest Details →	KOA 20:25 → LAS 05:05WN 2171	2h 35m Las Vegas	LAS 07:40 → SEA 10:25 +1WN 739	11h 00m	100%	75%
Tight connection: often missed
United Details →	KOA 11:55 → SFO 20:03UA 1722	51m San Francisco	SFO 20:54 → SEA 23:19UA 1007	8h 24m	72%	46%
Alaska Details →	KOA 13:26 → HNL 14:15AS 1077	52m Honolulu	HNL 15:07 → SEA 23:59AS 90	7h 33m	60%	41%
Alaska Details →	KOA 13:52 → OGG 14:29AS 1259	46m Kahului	OGG 15:15 → SEA 23:59AS 244	7h 07m	30%	25%

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

DEN · 1h 12m · leaves 20:00 7%

LAX · 1h 10m · leaves 21:37 8%

HNL · 1h 10m · leaves 10:51 15%

Afternoon and evening

HNL · 1h 17m · leaves 19:15 5%

PDX · 55m · leaves 11:58 18%

SFO · 51m · leaves 11:55 28%

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 1167 KOA 19:15 → HNL Delta DL 440 HNL 22:40 → SEA Connection details →	2h 37m	9h 20m	98%	91%
United UA 1719 KOA 22:15 → LAX Delta DL 1714 LAX 09:40 → SEA Connection details →	3h 08m	11h 19m	98%	89%
American AA 664 KOA 21:45 → PHX Delta DL 2374 PHX 09:20 → SEA Connection details →	2h 45m	11h 50m	99%	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