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

No clear winner: airlines and hours on this route all land within a few points of 84% on time.

Nonstops


Delta	SEA	TUS	3h 07m	90%	0.5%	365	Flying now
Alaska	SEA	TUS	3h 17m	80%	0.4%	700	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 →	SEA 09:30 → SLC 12:38DL 1016	2h 22m Salt Lake City	SLC 15:00 → TUS 16:07DL 3717 · flown by SkyWest	6h 37m	99%	92%
Delta Details →	SEA 05:30 → SLC 08:30DL 1128	55m Salt Lake City	SLC 09:25 → TUS 10:29DL 3718 · flown by SkyWest	4h 59m	93%	90%
United Details →	SEA 05:00 → DEN 08:43UA 2601	2h 47m Denver	DEN 11:30 → TUS 12:32UA 1188	7h 32m	99%	85%
American Details →	SEA 11:07 → PHX 14:10AA 3793 · flown by Envoy	2h 55m Phoenix	PHX 17:05 → TUS 17:54AA 4126 · flown by Envoy	6h 47m	96%	85%
Delta Details →	SEA 13:30 → SLC 16:40DL 1120	3h 50m Salt Lake City	SLC 20:30 → TUS 21:33DL 4054 · flown by SkyWest	8h 02m	98%	84%
Delta Details →	SEA 12:35 → LAX 15:26DL 2914	3h 55m Los Angeles	LAX 19:21 → TUS 21:00DL 3846 · flown by SkyWest	8h 25m	100%	82%
United Details →	SEA 11:55 → IAH 18:35UA 2293	1h 25m Houston	IAH 20:00 → TUS 20:42UA 4040 · flown by Mesa	8h 47m	96%	80%
American Details →	SEA 23:23 → DFW 05:18AA 2003	3h 02m Dallas-Fort Worth	DFW 08:20 → TUS 08:38 +1AA 1014	9h 15m	98%	78%
Tight connection: often missed
United Details →	SEA 08:45 → SFO 11:03UA 2831	1h 20m San Francisco	SFO 12:23 → TUS 14:47UA 6023 · flown by SkyWest	6h 02m	56%	40%
Southwest Details →	SEA 17:35 → LAS 20:15WN 2267	1h 45m Las Vegas	LAS 22:00 → TUS 23:28WN 354	5h 53m	73%	39%
United Details →	SEA 14:33 → DEN 18:22UA 333	48m Denver	DEN 19:10 → TUS 20:12UA 1762	5h 39m	44%	31%

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

DFW · 1h 09m · leaves 05:05 5%

SLC · 55m · leaves 05:30 7%

PHX · 47m · leaves 06:16 16%

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 360 SEA 08:48 → SLC Delta DL 3717 SLC 15:00 → TUS Connection details →	3h 05m	7h 19m	100%	94%
Southwest WN 3615 SEA 05:15 → DEN United UA 1188 DEN 11:30 → TUS Connection details →	2h 40m	7h 17m	96%	83%
Delta DL 2419 SEA 08:10 → PHX American AA 6373 PHX 13:35 → TUS Connection details →	2h 27m	6h 18m	98%	83%

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