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 3% of the time at 9 am and 35% of the time at 7 pm.

Nonstops


United	DEN	TUS	2h 10m	83%	0.2%	1,457	Flying now
Southwest	DEN	TUS	2h 00m	71%	0.3%	1,186	Flying now
Frontier	DEN	TUS	2h 03m	82%	1.2%	86	Not 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 (Tucson is 1 h behind Denver). Layovers up to 4 hours. Pick a connection for the details.


Delta Details →	DEN 05:40 → SLC 07:13DL 2544	2h 12m Salt Lake City	SLC 09:25 → TUS 10:29DL 3718 · flown by SkyWest	5h 49m	96%	93%
Southwest Details →	DEN 05:45 → LAS 06:40WN 3106	1h 00m Las Vegas	LAS 07:40 → TUS 09:00WN 519	4h 15m	100%	91%
American Details →	DEN 12:15 → PHX 13:08AA 1757	3h 57m Phoenix	PHX 17:05 → TUS 17:54AA 4126 · flown by Envoy	6h 39m	97%	86%
Southwest Details →	DEN 08:40 → PHX 09:35WN 431	3h 50m Phoenix	PHX 13:25 → TUS 14:10WN 1599	6h 30m	100%	84%
American Details →	DEN 11:44 → LAX 13:19AA 4957 · flown by SkyWest	2h 18m Los Angeles	LAX 15:37 → TUS 17:10AA 6372 · flown by SkyWest	6h 26m	100%	83%
Delta Details →	DEN 15:55 → SLC 17:34DL 1623	2h 56m Salt Lake City	SLC 20:30 → TUS 21:33DL 4054 · flown by SkyWest	6h 37m	96%	82%
United Details →	DEN 05:00 → IAH 08:32UA 320	1h 00m Houston	IAH 09:32 → TUS 10:07UA 6219 · flown by Mesa	6h 07m	97%	79%
Southwest Details →	DEN 08:00 → PHX 09:05WN 3336	3h 55m Phoenix	PHX 13:00 → TUS 13:50WN 4870	6h 50m	100%	77%
Tight connection: often missed
American Details →	DEN 10:38 → DFW 13:40AA 1756	1h 06m Dallas-Fort Worth	DFW 14:46 → TUS 15:01AA 584	5h 23m	74%	41%
United Details →	DEN 09:43 → SFO 11:25UA 1506	58m San Francisco	SFO 12:23 → TUS 14:47UA 6023 · flown by SkyWest	6h 04m	46%	33%
American Details →	DEN 18:10 → DFW 21:18AA 1322	1h 36m Dallas-Fort Worth	DFW 22:54 → TUS 23:11AA 1109	6h 02m	70%	32%

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

IAH · 1h 00m · leaves 05:00 3%

ATL · 53m · leaves 05:45 10%

SLC · 49m · leaves 07:05 11%

Afternoon and evening

IAH · 50m · leaves 15:35 35%

SAN · 1h 20m · leaves 16:55 37%

PHX · 50m · leaves 21:00 75%

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 4027 DEN 10:05 → SLC Delta DL 3717 SLC 15:00 → TUS Connection details →	3h 15m	7h 02m	100%	94%
United UA 1093 DEN 06:04 → LAX Delta DL 3766 LAX 09:30 → TUS Connection details →	1h 56m	6h 05m	99%	90%
Frontier F9 3219 DEN 06:00 → SLC Delta DL 3718 SLC 09:25 → TUS Connection details →	1h 54m	5h 29m	88%	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