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 1 time in 10 at 10 am and 32% of the time at 3 pm.

Nonstops


Delta	SAN	SLC	2h 04m	89%	0.8%	1,750	Flying now
Alaska	SAN	SLC	2h 08m	79%	0.7%	885	Flying now
Southwest	SAN	SLC	2h 00m	77%	0.2%	408	Flying now
Frontier	SAN	SLC	2h 05m	84%	0.8%	121	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 San Diego). Layovers up to 4 hours. Pick a connection for the details.


Delta Details →	SAN 06:15 → LAX 07:34DL 3743 · flown by SkyWest	2h 21m Los Angeles	LAX 09:55 → SLC 12:50DL 1434	5h 35m	99%	90%
Alaska Details →	SAN 06:50 → PDX 09:29AS 399	1h 26m Portland	PDX 10:55 → SLC 13:59AS 3112 · flown by SkyWest	6h 09m	98%	89%
Delta Details →	SAN 15:00 → LAX 16:04DL 4002 · flown by SkyWest	3h 11m Los Angeles	LAX 19:15 → SLC 22:05DL 2973	6h 05m	93%	86%
United Details →	SAN 06:35 → DEN 10:08UA 2368	3h 32m Denver	DEN 13:40 → SLC 15:13UA 1840	7h 38m	100%	83%
Frontier Details →	SAN 06:25 → DEN 10:03F9 2818	3h 15m Denver	DEN 13:18 → SLC 14:55F9 3981	7h 30m	97%	83%
United Details →	SAN 10:49 → LAX 11:58UA 5384 · flown by SkyWest	57m Los Angeles	LAX 12:55 → SLC 15:48UA 5371 · flown by SkyWest	3h 59m	89%	79%
Delta Details →	SAN 10:50 → LAX 12:12DL 3716 · flown by SkyWest	58m Los Angeles	LAX 13:10 → SLC 16:07DL 1647	4h 17m	90%	78%
Delta Details →	SAN 07:00 → SEA 10:05DL 2530	1h 00m Seattle	SEA 11:05 → SLC 14:11DL 1265	6h 11m	91%	77%
Tight connection: often missed
Delta Details →	SAN 15:00 → LAX 16:04DL 4002 · flown by SkyWest	1h 01m Los Angeles	LAX 17:05 → SLC 19:59DL 2311	3h 59m	73%	57%
Alaska Details →	SAN 15:16 → SEA 18:14AS 1381	53m Seattle	SEA 19:07 → SLC 22:14AS 3298 · flown by SkyWest	5h 58m	52%	41%
American Details →	SAN 16:32 → DFW 21:49AA 2485	1h 03m Dallas-Fort Worth	DFW 22:52 → SLC 00:36 +1AA 2378	7h 04m	45%	18%

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

SEA · 1h 00m · leaves 07:00 9%

LAX · 57m · leaves 10:49 11%

DEN · 1h 10m · leaves 08:32 16%

Afternoon and evening

SFO · 47m · leaves 18:27 56%

PHX · 50m · leaves 14:45 67%

DEN · 55m · leaves 13:20 82%

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.


Southwest WN 4509 SAN 09:30 → SJC Delta DL 1254 SJC 13:40 → SLC Connection details →	2h 40m	6h 06m	100%	94%
Southwest WN 1181 SAN 12:25 → SJC Delta DL 1260 SJC 17:01 → SLC Connection details →	3h 06m	6h 32m	100%	94%
Southwest WN 4198 SAN 07:15 → OAK Delta DL 4134 OAK 12:33 → SLC Connection details →	3h 43m	7h 14m	99%	92%

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