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 6% of the time at 11 am and 28% of the time at 10 pm.

Nonstops


Delta	SLC	SAN	1h 57m	84%	0.8%	1,749	Flying now
Alaska	SLC	SAN	2h 05m	84%	1.1%	883	Flying now
Southwest	SLC	SAN	1h 55m	75%	0.2%	408	Flying now
Frontier	SLC	SAN	1h 59m	86%	2.5%	121	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


United Details →	SLC 08:30 → DEN 10:27UA 5642 · flown by SkyWest	3h 03m Denver	DEN 13:30 → SAN 14:55UA 1302	7h 25m	98%	85%
Alaska Details →	SLC 08:20 → PDX 09:26AS 3004 · flown by SkyWest	1h 20m Portland	PDX 10:46 → SAN 13:27AS 1394	6h 07m	100%	84%
Southwest Details →	SLC 05:42 → DEN 07:08WN 3737	1h 07m Denver	DEN 08:15 → SAN 09:40WN 1699	4h 58m	98%	83%
Delta Details →	SLC 09:40 → LAX 10:42DL 1095	3h 29m Los Angeles	LAX 14:11 → SAN 15:11DL 4001 · flown by SkyWest	6h 31m	100%	82%
United Details →	SLC 16:42 → LAX 17:53UA 5456 · flown by SkyWest	57m Los Angeles	LAX 18:50 → SAN 19:51UA 5415 · flown by SkyWest	4h 09m	97%	82%
United Details →	SLC 05:15 → DEN 06:54UA 5683 · flown by SkyWest	49m Denver	DEN 07:43 → SAN 09:05UA 2309	4h 50m	91%	81%
Delta Details →	SLC 11:35 → SEA 12:52DL 2995	2h 33m Seattle	SEA 15:25 → SAN 18:13DL 2613	7h 38m	98%	81%
United Details →	SLC 07:00 → DEN 08:42UA 1232	2h 33m Denver	DEN 11:15 → SAN 12:41UA 1940	6h 41m	99%	81%
Tight connection: often missed
United Details →	SLC 08:30 → DEN 10:27UA 5642 · flown by SkyWest	48m Denver	DEN 11:15 → SAN 12:41UA 1940	5h 11m	64%	53%
American Details →	SLC 14:00 → DFW 17:50AA 2613	1h 12m Dallas-Fort Worth	DFW 19:02 → SAN 20:03AA 1243	7h 03m	67%	37%
United Details →	SLC 09:49 → SFO 11:13UA 5970 · flown by SkyWest	1h 08m San Francisco	SFO 12:21 → SAN 14:08UA 1257	5h 19m	40%	27%

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

PDX · 1h 20m · leaves 08:20 0%

DEN · 1h 17m · leaves 07:45 2%

SMF · 1h 05m · leaves 05:45 5%

Afternoon and evening

LAS · 1h 20m · leaves 20:30 36%

DFW · 1h 04m · leaves 16:42 50%

DEN · 1h 00m · leaves 16:45 72%

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.


Frontier F9 3862 SLC 08:16 → DEN United UA 1302 DEN 13:30 → SAN Connection details →	3h 29m	7h 39m	99%	85%
Southwest WN 3739 SLC 10:40 → DEN United UA 1281 DEN 15:55 → SAN Connection details →	3h 50m	7h 40m	100%	85%
Southwest WN 3738 SLC 07:45 → DEN United UA 1940 DEN 11:15 → SAN Connection details →	2h 00m	5h 56m	98%	81%

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