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 4 in 5 on time.

Nonstops


Delta	SEA	JNU	2h 34m	83%	0.7%	141	Flying now
Alaska	SEA	JNU	2h 35m	80%	1.2%	1,447	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Juneau on time. Total trip = scheduled departure to arrival, layover included (Juneau is 1 h behind Seattle). Layovers up to 4 hours. Pick a connection for the details.


Alaska Details →	SEA 10:14 → ANC 13:00AS 1810	3h 21m Anchorage	ANC 16:21 → JNU 18:03AS 1537	8h 49m	100%	90%
Alaska Details →	SEA 14:47 → ANC 17:26AS 660	2h 21m Anchorage	ANC 19:47 → JNU 21:28AS 70	7h 41m	100%	87%
Alaska Details →	SEA 06:03 → ANC 08:40AS 85	1h 51m Anchorage	ANC 10:31 → JNU 12:13AS 64	7h 10m	99%	83%
Alaska Details →	SEA 15:37 → KTN 16:43AS 67	3h 44m Ketchikan	KTN 20:27 → JNU 21:25AS 69	6h 48m	99%	82%

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.

Afternoon and evening

ANC · 1h 15m · leaves 12:18 16%

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.


Delta DL 922 SEA 10:35 → ANC Alaska AS 1537 ANC 16:21 → JNU Connection details →	3h 06m	8h 28m	98%	87%
Delta DL 928 SEA 13:30 → ANC Alaska AS 70 ANC 19:47 → JNU Connection details →	3h 32m	8h 58m	96%	83%

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