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 2% of the time at 10 am and 1 time in 3 at 8 pm.

Nonstops (seasonal or thin)


Southwest	TUS	SAN	1h 20m	77%	0.5%	654	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. Layovers up to 4 hours. Pick a connection for the details.


Delta Details →	TUS 12:27 → LAX 14:15DL 3744 · flown by SkyWest	4h 00m Los Angeles	LAX 18:15 → SAN 19:16DL 4087 · flown by SkyWest	6h 49m	100%	83%
Delta Details →	TUS 11:16 → SLC 14:17DL 3718 · flown by SkyWest	2h 53m Salt Lake City	SLC 17:10 → SAN 18:06DL 1252	6h 50m	99%	83%
United Details →	TUS 05:45 → DEN 08:38UA 2418	2h 37m Denver	DEN 11:15 → SAN 12:41UA 1940	6h 56m	100%	82%
Delta Details →	TUS 07:05 → SLC 10:11DL 3745 · flown by SkyWest	1h 04m Salt Lake City	SLC 11:15 → SAN 12:17DL 1296	5h 12m	98%	81%
Southwest Details →	TUS 06:12 → DEN 09:02WN 4059	1h 30m Denver	DEN 10:32 → SAN 12:00WN 1700	5h 45m	100%	79%
American Details →	TUS 05:45 → PHX 06:36AA 2622	58m Phoenix	PHX 07:34 → SAN 08:51AA 2461	3h 06m	100%	79%
Alaska Details →	TUS 10:31 → PDX 13:46AS 2216 · flown by Horizon	1h 09m Portland	PDX 14:55 → SAN 17:29AS 1312	6h 58m	100%	76%
Delta Details →	TUS 06:20 → LAX 08:04DL 3502 · flown by SkyWest	46m Los Angeles	LAX 08:50 → SAN 09:51DL 3716 · flown by SkyWest	3h 32m	89%	70%
Tight connection: often missed
United Details →	TUS 09:04 → SFO 11:25UA 4683 · flown by SkyWest	56m San Francisco	SFO 12:21 → SAN 14:08UA 1257	5h 04m	60%	40%
American Details →	TUS 15:57 → DFW 20:29AA 584	1h 05m Dallas-Fort Worth	DFW 21:34 → SAN 22:37AA 1011	6h 40m	68%	21%
Southwest Details →	TUS 15:00 → DEN 17:55WN 1599	1h 20m Denver	DEN 19:15 → SAN 20:40WN 1703	5h 40m	51%	10%

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

SLC · 1h 04m · leaves 07:05 2%

LAX · 46m · leaves 06:20 11%

PHX · 53m · leaves 08:39 12%

Afternoon and evening

SFO · 1h 10m · leaves 15:28 19%

DFW · 1h 05m · leaves 15:57 32%

DEN · 1h 20m · leaves 15:00 49%

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 446 TUS 09:40 → LAX Delta DL 4001 LAX 14:11 → SAN Connection details →	2h 56m	5h 31m	100%	82%
Southwest WN 4059 TUS 06:12 → DEN United UA 1940 DEN 11:15 → SAN Connection details →	2h 13m	6h 29m	99%	82%
American AA 6376 TUS 12:34 → LAX Delta DL 4087 LAX 18:15 → SAN Connection details →	4h 00m	6h 42m	97%	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