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 16% of the time at 9 am and 2 times in 5 at 7 pm.

Nonstops


United	ORD	TUS	4h 23m	73%	2.0%	539	Flying now
American	ORD	TUS	3h 57m	69%	1.2%	503	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 2 h behind Chicago). Layovers up to 4 hours. Pick a connection for the details.


United Details →	ORD 06:00 → DEN 07:42UA 2806	3h 48m Denver	DEN 11:30 → TUS 12:32UA 1188	8h 32m	100%	85%
Delta Details →	ORD 05:30 → ATL 08:33DL 1264	3h 02m Atlanta	ATL 11:35 → TUS 12:19DL 937	8h 49m	98%	82%
American Details →	ORD 06:00 → LAX 08:20AA 607	2h 08m Los Angeles	LAX 10:28 → TUS 12:03AA 6376 · flown by SkyWest	8h 03m	98%	81%
United Details →	ORD 05:30 → IAH 08:18UA 2310	1h 14m Houston	IAH 09:32 → TUS 10:07UA 6219 · flown by Mesa	6h 37m	99%	81%
United Details →	ORD 14:15 → IAH 17:20UA 2451	2h 40m Houston	IAH 20:00 → TUS 20:42UA 4040 · flown by Mesa	8h 27m	95%	79%
Delta Details →	ORD 14:09 → SLC 16:40DL 2249	3h 50m Salt Lake City	SLC 20:30 → TUS 21:33DL 4054 · flown by SkyWest	9h 23m	94%	79%
Delta Details →	ORD 14:42 → LAX 17:14DL 967	2h 07m Los Angeles	LAX 19:21 → TUS 21:00DL 3846 · flown by SkyWest	8h 18m	95%	78%
Alaska Details →	ORD 13:01 → SEA 15:42AS 579	2h 03m Seattle	SEA 17:45 → TUS 21:05AS 3225 · flown by SkyWest	10h 04m	90%	78%
Tight connection: often missed
American Details →	ORD 08:30 → DFW 11:04AA 1555	1h 07m Dallas-Fort Worth	DFW 12:11 → TUS 12:26AA 2926	5h 56m	74%	49%
American Details →	ORD 15:50 → DFW 18:28AA 2754	1h 08m Dallas-Fort Worth	DFW 19:36 → TUS 19:52AA 1207	6h 02m	69%	38%
American Details →	ORD 19:26 → DFW 22:08AA 3544 · flown by Envoy	46m Dallas-Fort Worth	DFW 22:54 → TUS 23:11AA 1109	5h 46m	62%	29%

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 14m · leaves 05:30 1%

PHX · 56m · leaves 07:25 16%

DFW · 50m · leaves 05:00 19%

Afternoon and evening

DFW · 46m · leaves 19:26 38%

IAH · 50m · leaves 16:05 41%

PHX · 56m · leaves 14:25 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.


United UA 1972 ORD 08:55 → SLC Delta DL 3717 SLC 15:00 → TUS Connection details →	3h 21m	9h 12m	99%	91%
American AA 1747 ORD 06:41 → DEN United UA 1188 DEN 11:30 → TUS Connection details →	3h 06m	7h 51m	99%	85%
United UA 2225 ORD 09:02 → PHX American AA 6373 PHX 13:35 → TUS Connection details →	2h 32m	7h 26m	100%	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