Sun, Oct 4 has passed, so this is the 12-month record.

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

No clear winner: Southwest’s SAN → TUS flights land within a few points of 77% on time whatever the hour.

Nonstops (seasonal or thin)


Southwest	SAN	TUS	1h 30m	77%	0.3%	654	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Delta Details →	SAN 09:47 → SLC 12:50DL 1177	2h 10m Salt Lake City	SLC 15:00 → TUS 16:07DL 3717 · flown by SkyWest	6h 20m	98%	91%
Delta Details →	SAN 06:15 → LAX 07:34DL 3743 · flown by SkyWest	1h 56m Los Angeles	LAX 09:30 → TUS 11:08DL 3766 · flown by SkyWest	4h 54m	99%	90%
American Details →	SAN 12:46 → PHX 14:16AA 2477	2h 49m Phoenix	PHX 17:05 → TUS 17:54AA 4126 · flown by Envoy	5h 08m	99%	86%
United Details →	SAN 06:35 → DEN 10:08UA 2368	1h 22m Denver	DEN 11:30 → TUS 12:32UA 1188	5h 57m	98%	83%
American Details →	SAN 09:41 → PHX 11:09AA 2461	2h 26m Phoenix	PHX 13:35 → TUS 14:28AA 6373 · flown by SkyWest	4h 47m	96%	81%
Delta Details →	SAN 10:50 → LAX 12:12DL 3716 · flown by SkyWest	2h 00m Los Angeles	LAX 14:12 → TUS 15:50DL 3776 · flown by SkyWest	5h 00m	99%	80%
Delta Details →	SAN 15:00 → LAX 16:04DL 4002 · flown by SkyWest	3h 17m Los Angeles	LAX 19:21 → TUS 21:00DL 3846 · flown by SkyWest	6h 00m	93%	77%
Southwest Details →	SAN 09:15 → PHX 10:40WN 681	2h 20m Phoenix	PHX 13:00 → TUS 13:50WN 4870	4h 35m	100%	77%
Tight connection: often missed
American Details →	SAN 16:23 → PHX 17:49AA 2470	1h 18m Phoenix	PHX 19:07 → TUS 20:01AA 6370 · flown by SkyWest	3h 38m	74%	47%
Alaska Details →	SAN 13:59 → SEA 16:58AS 465	47m Seattle	SEA 17:45 → TUS 21:05AS 3225 · flown by SkyWest	7h 06m	51%	45%
American Details →	SAN 16:32 → DFW 21:49AA 2485	1h 05m Dallas-Fort Worth	DFW 22:54 → TUS 23:11AA 1109	6h 40m	48%	21%

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 06:18 9%

PHX · 1h 07m · leaves 09:41 15%

Afternoon and evening

SFO · 50m · leaves 18:27 52%

DFW · 1h 05m · leaves 16:32 52%

DEN · 1h 15m · leaves 13:20 55%

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 3122 SAN 08:55 → SLC Delta DL 3717 SLC 15:00 → TUS Connection details →	2h 51m	7h 12m	98%	92%
United UA 1006 SAN 06:20 → LAX Delta DL 3766 LAX 09:30 → TUS Connection details →	2h 09m	4h 49m	97%	89%
Southwest WN 681 SAN 09:15 → PHX American AA 6373 PHX 13:35 → TUS Connection details →	2h 55m	5h 13m	100%	85%

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