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


American	SEA	PHX	3h 02m	84%	0.2%	1,394	Flying now
Delta	SEA	PHX	3h 00m	83%	1.0%	1,766	Flying now
Alaska	SEA	PHX	2h 59m	80%	0.6%	2,887	Flying now
Southwest	SEA	PHX	2h 50m	68%	0.8%	1,039	Flying now
Frontier	SEA	PHX	3h 02m	71%	4.3%	139	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Southwest Details →	SEA 06:15 → OAK 08:25WN 266	1h 50m Oakland	OAK 10:15 → PHX 12:10WN 4766	5h 55m	100%	94%
Alaska Details →	SEA 09:59 → BOI 12:26AS 2230 · flown by Horizon	2h 29m Boise	BOI 14:55 → PHX 16:14AS 3095 · flown by SkyWest	6h 15m	97%	93%
Southwest Details →	SEA 05:00 → SMF 06:50WN 3629	55m Sacramento	SMF 07:45 → PHX 09:35WN 106	4h 35m	96%	89%
Delta Details →	SEA 11:05 → SLC 14:11DL 1265	3h 14m Salt Lake City	SLC 17:25 → PHX 18:07DL 1451	7h 02m	99%	88%
Alaska Details →	SEA 06:42 → PDX 07:37AS 2432 · flown by Horizon	2h 53m Portland	PDX 10:30 → PHX 13:20AS 716	6h 38m	100%	88%
Delta Details →	SEA 07:15 → LAX 10:05DL 1628	3h 43m Los Angeles	LAX 13:48 → PHX 15:21DL 3894 · flown by SkyWest	8h 08m	100%	87%
United Details →	SEA 17:04 → LAX 19:53UA 1730	1h 29m Los Angeles	LAX 21:22 → PHX 22:59UA 5458 · flown by SkyWest	5h 55m	94%	87%
Delta Details →	SEA 12:35 → LAX 15:26DL 2914	2h 15m Los Angeles	LAX 17:41 → PHX 19:15DL 4077 · flown by SkyWest	6h 40m	98%	86%
Tight connection: often missed
Alaska Details →	SEA 15:55 → PDX 16:55AS 686	56m Portland	PDX 17:51 → PHX 20:37AS 746	4h 42m	68%	53%
Alaska Details →	SEA 11:36 → BOI 14:07AS 2106 · flown by Horizon	48m Boise	BOI 14:55 → PHX 16:14AS 3095 · flown by SkyWest	4h 38m	52%	49%
United Details →	SEA 07:00 → SFO 09:18UA 1578	47m San Francisco	SFO 10:05 → PHX 12:14UA 500	5h 14m	7%	5%

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 10m · leaves 07:50 2%

SMF · 55m · leaves 05:00 4%

SLC · 1h 07m · leaves 07:15 4%

Afternoon and evening

MSP · 1h 11m · leaves 12:05 9%

DEN · 1h 08m · leaves 15:19 17%

PDX · 56m · leaves 15:55 32%

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 1367 SEA 10:03 → LAX United UA 5457 LAX 16:22 → PHX Connection details →	3h 26m	7h 56m	100%	99%
Delta DL 1628 SEA 07:15 → LAX United UA 5450 LAX 13:05 → PHX Connection details →	3h 00m	7h 27m	99%	96%
Delta DL 3678 SEA 08:35 → BOI Alaska AS 3095 BOI 14:55 → PHX Connection details →	3h 40m	7h 39m	100%	96%

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