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

Connect in the morning. The same one-hour layover misses 6% of the time at 8 am and 1 time in 5 at 6 pm.

Nonstops (seasonal or thin)


Delta	ATL	TUS	4h 00m	83%	1.9%	809	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 3 h behind Atlanta). Layovers up to 4 hours. Pick a connection for the details.


Delta Details →	ATL 10:05 → SLC 12:10DL 387	2h 50m Salt Lake City	SLC 15:00 → TUS 16:07DL 3717 · flown by SkyWest	9h 02m	99%	93%
Delta Details →	ATL 15:24 → SLC 17:24DL 526	3h 06m Salt Lake City	SLC 20:30 → TUS 21:33DL 4054 · flown by SkyWest	9h 08m	99%	85%
United Details →	ATL 07:30 → DEN 08:51UA 340	2h 39m Denver	DEN 11:30 → TUS 12:32UA 1188	8h 02m	98%	83%
Delta Details →	ATL 14:35 → LAX 16:16DL 753	3h 05m Los Angeles	LAX 19:21 → TUS 21:00DL 3846 · flown by SkyWest	9h 25m	99%	81%
Delta Details →	ATL 09:15 → LAX 10:53DL 827	3h 19m Los Angeles	LAX 14:12 → TUS 15:50DL 3776 · flown by SkyWest	9h 35m	99%	78%
United Details →	ATL 15:57 → IAH 17:23UA 3992 · flown by Mesa	2h 37m Houston	IAH 20:00 → TUS 20:42UA 4040 · flown by Mesa	7h 45m	93%	78%
American Details →	ATL 07:48 → PHX 09:00AA 1777	3h 16m Phoenix	PHX 12:16 → TUS 13:09AA 4935 · flown by SkyWest	8h 21m	98%	78%
United Details →	ATL 07:05 → IAH 08:15UA 532	1h 17m Houston	IAH 09:32 → TUS 10:07UA 6219 · flown by Mesa	6h 02m	94%	77%
Tight connection: often missed
Southwest Details →	ATL 18:20 → DEN 19:40WN 3002	1h 20m Denver	DEN 21:00 → TUS 22:02WN 4313	6h 40m	56%	28%
American Details →	ATL 20:01 → DFW 21:32AA 1379	1h 22m Dallas-Fort Worth	DFW 22:54 → TUS 23:11AA 1109	6h 11m	54%	24%
United Details →	ATL 18:00 → SFO 20:10UA 285	47m San Francisco	SFO 20:57 → TUS 23:26UA 5688 · flown by SkyWest	8h 26m	30%	23%

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 17m · leaves 07:05 6%

PHX · 1h 05m · leaves 07:48 10%

DFW · 47m · leaves 06:01 18%

Afternoon and evening

DEN · 1h 20m · leaves 18:20 44%

SFO · 47m · leaves 18:00 70%

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 2114 ATL 06:25 → DEN United UA 1188 DEN 11:30 → TUS Connection details →	4h 00m	9h 07m	100%	86%
Delta DL 366 ATL 13:30 → PHX American AA 4126 PHX 17:05 → TUS Connection details →	2h 47m	7h 24m	98%	85%
Delta DL 326 ATL 11:30 → LAX American AA 6372 LAX 15:37 → TUS Connection details →	2h 32m	8h 40m	98%	82%

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