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 SLC → MDW flights land within a few points of 84% on time whatever the hour.

Nonstops (seasonal or thin)


Southwest	SLC	MDW	3h 05m	84%	0.6%	619	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Chicago on time. Total trip = scheduled departure to arrival, layover included (Chicago is 1 h ahead of Salt Lake City). Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	SLC 20:15 → SMF 20:55WN 3757	2h 55m Sacramento	SMF 23:50 → MDW 05:45 +1WN 3802	8h 30m	96%	88%
Southwest Details →	SLC 05:42 → DEN 07:08WN 3737	2h 52m Denver	DEN 10:00 → MDW 13:25WN 755	6h 43m	100%	85%
Southwest Details →	SLC 05:00 → DAL 08:30WN 1725	1h 35m Dallas	DAL 10:05 → MDW 12:20WN 1357	6h 20m	100%	78%
Southwest Details →	SLC 20:30 → LAS 20:55WN 3745	3h 00m Las Vegas	LAS 23:55 → MDW 05:25 +1WN 2276	7h 55m	92%	78%
Delta Details →	SLC 06:00 → DTW 11:23DL 2289	1h 02m Detroit	DTW 12:25 → MDW 12:46DL 4688 · flown by Endeavor	5h 46m	95%	77%
Southwest Details →	SLC 06:25 → LAS 06:50WN 4205	1h 30m Las Vegas	LAS 08:20 → MDW 13:55WN 2271	6h 30m	100%	75%
Delta Details →	SLC 23:50 → DTW 05:19DL 2841	3h 31m Detroit	DTW 08:50 → MDW 09:14 +1DL 4684 · flown by Endeavor	8h 24m	100%	74%
Delta Details →	SLC 07:00 → ATL 12:44DL 907	2h 31m Atlanta	ATL 15:15 → MDW 16:15DL 1728	8h 15m	99%	74%
Tight connection: often missed
Southwest Details →	SLC 21:25 → PHX 22:05WN 3753	1h 50m Phoenix	PHX 23:55 → MDW 05:10 +1WN 3298	6h 45m	68%	56%
Southwest Details →	SLC 10:40 → DEN 12:05WN 3739	55m Denver	DEN 13:00 → MDW 16:20WN 1601	4h 40m	41%	24%
Southwest Details →	SLC 14:50 → LAS 15:15WN 4338	50m Las Vegas	LAS 16:05 → MDW 21:45WN 2274	5h 53m	29%	14%

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

DTW · 1h 02m · leaves 06:00 5%

LAS · 1h 05m · leaves 11:05 17%

Afternoon and evening

LAS · 50m · leaves 14:50 71%

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 5683 SLC 05:15 → DEN Southwest WN 755 DEN 10:00 → MDW Connection details →	3h 06m	7h 10m	98%	86%
Delta DL 2069 SLC 23:36 → MCO Southwest WN 2835 MCO 08:00 → MDW Connection details →	2h 00m	9h 14m	91%	84%
Delta DL 2841 SLC 23:50 → DTW Southwest WN 1781 DTW 08:40 → MDW Connection details →	3h 21m	8h 05m	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