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 GEG → MDW flights land within a few points of 86% on time whatever the hour.

Nonstops (seasonal or thin)


Southwest	GEG	MDW	3h 30m	86%	0.0%	86	Flying now

Best connections, any airlines

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Chicago on time. Total trip = scheduled departure to arrival, layover included (Chicago is 2 h ahead of Spokane). Layovers up to 4 hours. Pick a connection for the details.


Delta + Southwesttwo ticketsDetails →	GEG 22:48 → ATL 06:05DL 1843	3h 55m Atlanta	ATL 10:00 → MDW 11:00 +1WN 224	10h 12m	100%	89%
United + Southwesttwo ticketsDetails →	GEG 05:00 → DEN 08:20UA 1234	1h 40m Denver	DEN 10:00 → MDW 13:25WN 755	6h 25m	95%	82%
Alaska + Southwesttwo ticketsDetails →	GEG 19:41 → PDX 20:50AS 2407 · flown by Horizon	2h 40m Portland	PDX 23:30 → MDW 05:20 +1WN 3203	7h 39m	95%	82%
Delta + Southwesttwo ticketsDetails →	GEG 17:37 → SEA 19:05DL 3857 · flown by SkyWest	4h 00m Seattle	SEA 23:05 → MDW 05:00 +1WN 2304	9h 23m	100%	67%
Delta Details →	GEG 12:47 → ATL 20:14DL 787	1h 01m Atlanta	ATL 21:15 → MDW 22:17DL 1076	7h 30m	87%	64%
Alaska + Southwesttwo ticketsDetails →	GEG 08:31 → PDX 09:46AS 3201 · flown by SkyWest	2h 04m Portland	PDX 11:50 → MDW 17:45WN 3202	7h 14m	100%	63%
American + Frontiertwo ticketsDetails →	GEG 05:16 → DFW 10:55AA 484	3h 35m Dallas-Fort Worth	DFW 14:30 → MDW 16:51F9 2882	9h 38m	99%	62%
Southwest Details →	GEG 06:00 → DEN 09:10WN 1333	3h 50m Denver	DEN 13:00 → MDW 16:20WN 1601	8h 20m	100%	59%

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

DEN · 50m · leaves 06:00 6%

Afternoon and evening

ATL · 1h 01m · leaves 12:47 13%

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.

The table above includes two-ticket connections (marked “two tickets”), held to the 90-minute minimum. One ticket only →

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