Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

No clear winner: Delta’s GEG → SLC flights land within a few points of 9 in 10 on time whatever the hour.

Nonstops


Delta	GEG	SLC	1h 49m	91%	0.7%	1,671	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Southwest Details →	GEG 05:00 → SMF 06:50WN 367	1h 15m Sacramento	SMF 08:05 → SLC 10:40WN 3827	4h 40m	97%	92%
Alaska Details →	GEG 08:31 → PDX 09:46AS 3201 · flown by SkyWest	1h 09m Portland	PDX 10:55 → SLC 13:59AS 3112 · flown by SkyWest	4h 28m	100%	92%
Alaska Details →	GEG 05:00 → PDX 06:10AS 710	1h 42m Portland	PDX 07:52 → SLC 10:45AS 2333 · flown by Horizon	4h 45m	99%	90%
Delta Details →	GEG 06:20 → LAX 09:16DL 3696 · flown by SkyWest	2h 25m Los Angeles	LAX 11:41 → SLC 14:30DL 1194	7h 14m	99%	89%
Alaska Details →	GEG 05:07 → SEA 06:15AS 2065 · flown by Horizon	2h 33m Seattle	SEA 08:48 → SLC 11:55AS 360	5h 48m	100%	88%
Delta Details →	GEG 05:30 → SEA 06:40DL 2218	2h 50m Seattle	SEA 09:30 → SLC 12:38DL 1016	6h 08m	97%	86%
Delta Details →	GEG 07:00 → SEA 08:24DL 3790 · flown by SkyWest	2h 41m Seattle	SEA 11:05 → SLC 14:11DL 1265	6h 11m	97%	82%
Delta Details →	GEG 09:20 → SEA 10:55DL 3830 · flown by SkyWest	2h 35m Seattle	SEA 13:30 → SLC 16:40DL 1120	6h 20m	98%	81%
Tight connection: often missed
Alaska Details →	GEG 14:39 → SEA 15:49AS 2119 · flown by Horizon	58m Seattle	SEA 16:47 → SLC 19:50AS 373	4h 11m	63%	50%
United Details →	GEG 13:41 → DEN 16:57UA 1255	48m Denver	DEN 17:45 → SLC 19:25UA 5762 · flown by SkyWest	4h 44m	67%	49%
Alaska Details →	GEG 15:16 → PDX 16:32AS 3202 · flown by SkyWest	1h 08m Portland	PDX 17:40 → SLC 20:41AS 3291 · flown by SkyWest	4h 25m	22%	18%

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

PDX · 1h 09m · leaves 08:31 <1%

SEA · 1h 03m · leaves 05:07 4%

DEN · 55m · leaves 06:00 4%

Afternoon and evening

SFO · 1h 10m · leaves 12:37 17%

DEN · 48m · leaves 13:41 33%

PDX · 1h 08m · leaves 15:16 78%

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.


Alaska AS 2031 GEG 08:53 → BOI Delta DL 1442 BOI 13:05 → SLC Connection details →	2h 03m	4h 28m	100%	93%
Southwest WN 367 GEG 05:00 → SMF Delta DL 1367 SMF 09:45 → SLC Connection details →	2h 55m	6h 26m	100%	91%
Southwest WN 1884 GEG 05:25 → PHX Delta DL 1447 PHX 09:45 → SLC Connection details →	1h 45m	5h 58m	97%	90%

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