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 SLC → GEG flights land within a few points of 87% on time whatever the hour.

Nonstops


Delta	SLC	GEG	1h 52m	87%	0.5%	1,671	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Alaska Details →	SLC 11:22 → PDX 12:23AS 2333 · flown by Horizon	2h 07m Portland	PDX 14:30 → GEG 15:41AS 3262 · flown by SkyWest	5h 19m	95%	95%
Delta Details →	SLC 09:40 → LAX 10:42DL 1095	2h 24m Los Angeles	LAX 13:06 → GEG 15:48DL 3794 · flown by SkyWest	7h 08m	99%	92%
Delta Details →	SLC 11:35 → SEA 12:52DL 2995	2h 48m Seattle	SEA 15:40 → GEG 16:57DL 3857 · flown by SkyWest	6h 22m	98%	90%
Alaska Details →	SLC 06:23 → SEA 07:35AS 1444	2h 20m Seattle	SEA 09:55 → GEG 11:00AS 2200 · flown by Horizon	5h 37m	100%	90%
Delta Details →	SLC 15:14 → SEA 16:30DL 2817	3h 26m Seattle	SEA 19:56 → GEG 21:12DL 3677 · flown by SkyWest	6h 58m	100%	89%
United Details →	SLC 08:30 → DEN 10:27UA 5642 · flown by SkyWest	3h 19m Denver	DEN 13:46 → GEG 15:12UA 324	7h 41m	98%	86%
Delta Details →	SLC 17:10 → LAX 18:10DL 1161	3h 15m Los Angeles	LAX 21:25 → GEG 00:05 +1DL 3576 · flown by SkyWest	7h 55m	98%	84%
Alaska Details →	SLC 08:20 → PDX 09:26AS 3004 · flown by SkyWest	1h 04m Portland	PDX 10:30 → GEG 11:45AS 250	4h 25m	97%	84%
Tight connection: often missed
United Details →	SLC 08:30 → DEN 10:27UA 5642 · flown by SkyWest	48m Denver	DEN 11:15 → GEG 12:37UA 295	5h 07m	64%	53%
American Details →	SLC 14:00 → DFW 17:50AA 2613	1h 08m Dallas-Fort Worth	DFW 18:58 → GEG 20:45AA 1446	7h 45m	61%	29%
Alaska Details →	SLC 09:10 → SEA 10:35AS 3381 · flown by SkyWest	48m Seattle	SEA 11:23 → GEG 12:29AS 449	4h 19m	36%	22%

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 04m · leaves 08:20 3%

MDW · 55m · leaves 06:55 5%

SFO · 51m · leaves 06:05 16%

Afternoon and evening

LAS · 1h 15m · leaves 20:30 40%

PHX · 53m · leaves 18:50 49%

SMF · 55m · leaves 20:15 52%

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.


Delta DL 1209 SLC 11:15 → PDX Alaska AS 3262 PDX 14:30 → GEG Connection details →	2h 20m	5h 26m	96%	95%
Alaska AS 796 SLC 11:17 → SEA Delta DL 3857 SEA 15:40 → GEG Connection details →	3h 10m	6h 40m	99%	90%
Frontier F9 3862 SLC 08:16 → DEN United UA 324 DEN 13:46 → GEG Connection details →	3h 45m	7h 55m	99%	86%

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