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

Connect in the morning. The same one-hour layover misses 4% of the time at 11 am and 1 time in 3 at 6 pm.

Nonstops


Delta	SEA	SLC	2h 08m	87%	0.5%	2,227	Flying now
Alaska	SEA	SLC	2h 07m	81%	1.1%	1,828	Flying now
Frontier	SEA	SLC	2h 09m	74%	3.3%	90	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Southwest Details →	SEA 05:00 → SMF 06:50WN 3629	1h 15m Sacramento	SMF 08:05 → SLC 10:40WN 3827	4h 40m	100%	95%
Alaska Details →	SEA 10:14 → PDX 11:21AS 3090 · flown by SkyWest	3h 09m Portland	PDX 14:30 → SLC 17:29AS 3120 · flown by SkyWest	6h 15m	100%	94%
Delta Details →	SEA 13:30 → PSC 14:45DL 3891 · flown by SkyWest	2h 36m Pasco	PSC 17:21 → SLC 20:10DL 3728 · flown by SkyWest	5h 40m	99%	94%
Delta Details →	SEA 07:15 → GEG 08:36DL 3830 · flown by SkyWest	1h 14m Spokane	GEG 09:50 → SLC 12:41DL 4444 · flown by SkyWest	4h 31m	97%	94%
Delta Details →	SEA 11:45 → SJC 14:11DL 3789 · flown by SkyWest	2h 50m San Jose	SJC 17:01 → SLC 19:57DL 1260	7h 12m	98%	92%
Delta Details →	SEA 08:25 → SJC 10:49DL 3736 · flown by SkyWest	2h 51m San Jose	SJC 13:40 → SLC 16:33DL 1254	7h 11m	98%	92%
Delta Details →	SEA 07:15 → BOI 09:56DL 3750 · flown by SkyWest	3h 09m Boise	BOI 13:05 → SLC 14:21DL 1442	6h 06m	99%	92%
Alaska Details →	SEA 06:42 → PDX 07:37AS 2432 · flown by Horizon	3h 18m Portland	PDX 10:55 → SLC 13:59AS 3112 · flown by SkyWest	6h 17m	100%	91%
Tight connection: often missed
Delta Details →	SEA 09:55 → LAS 12:28DL 2905	47m Las Vegas	LAS 13:15 → SLC 15:48DL 1659	4h 53m	70%	58%
Delta Details →	SEA 09:45 → SAN 12:38DL 2533	47m San Diego	SAN 13:25 → SLC 16:32DL 1296	5h 47m	66%	55%
Delta Details →	SEA 13:50 → DEN 17:46DL 2543	1h 14m Denver	DEN 19:00 → SLC 20:38DL 2663	5h 48m	70%	49%

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

SMF · 1h 15m · leaves 05:00 0%

GEG · 1h 14m · leaves 07:15 3%

DEN · 1h 15m · leaves 05:15 4%

Afternoon and evening

LAS · 58m · leaves 16:20 24%

DEN · 1h 14m · leaves 13:50 30%

DFW · 58m · leaves 11:40 34%

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 2142 SEA 07:40 → SBA Delta DL 3841 SBA 12:45 → SLC Connection details →	2h 31m	7h 12m	100%	96%
Delta DL 3818 SEA 09:30 → PDX Alaska AS 3120 PDX 14:30 → SLC Connection details →	3h 51m	6h 59m	100%	96%
Alaska AS 2195 SEA 08:52 → PSC Delta DL 3892 PSC 13:50 → SLC Connection details →	3h 57m	6h 46m	100%	93%

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