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 IDA → SLC flights land within a few points of 92% on time whatever the hour.

Nonstops


Delta	IDA	SLC	1h 06m	92%	0.4%	1,193	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. Layovers up to 4 hours. Pick a connection for the details.


Alaska Details →	IDA 13:43 → SEA 14:48AS 3489 · flown by SkyWest	1h 59m Seattle	SEA 16:47 → SLC 19:50AS 373	6h 07m	100%	80%
United Details →	IDA 07:00 → DEN 08:55UA 4706 · flown by SkyWest	2h 45m Denver	DEN 11:40 → SLC 13:13UA 1963	6h 13m	98%	77%
United Details →	IDA 16:14 → DEN 18:05UA 5666 · flown by SkyWest	3h 00m Denver	DEN 21:05 → SLC 22:44UA 5646 · flown by SkyWest	6h 30m	95%	76%
United Details →	IDA 10:35 → DEN 12:28UA 5793 · flown by SkyWest	1h 12m Denver	DEN 13:40 → SLC 15:13UA 1840	4h 38m	91%	76%
Alaska Details →	IDA 07:15 → SEA 08:21AS 3054 · flown by SkyWest	3h 30m Seattle	SEA 11:51 → SLC 15:04AS 733	7h 49m	98%	67%
United Details →	IDA 14:30 → DEN 16:18UA 2155	1h 27m Denver	DEN 17:45 → SLC 19:25UA 5762 · flown by SkyWest	4h 55m	87%	63%
American Details →	IDA 07:00 → DFW 11:00AA 6466 · flown by SkyWest	3h 10m Dallas-Fort Worth	DFW 14:10 → SLC 15:52AA 2594	8h 52m	97%	43%
Tight connection: often missed
Alaska Details →	IDA 16:14 → PDX 16:50AS 3421 · flown by SkyWest	50m Portland	PDX 17:40 → SLC 20:41AS 3291 · flown by SkyWest	4h 27m	38%	31%
American Details →	IDA 13:53 → DFW 17:49AA 5010 · flown by SkyWest	59m Dallas-Fort Worth	DFW 18:48 → SLC 20:34AA 558	6h 41m	59%	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.

Afternoon and evening

DEN · 1h 18m · leaves 16:14 19%

DFW · 59m · leaves 13:53 41%

PDX · 50m · leaves 16:14 62%

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 3054 IDA 07:15 → SEA Delta DL 1265 SEA 11:05 → SLC Connection details →	2h 44m	6h 56m	98%	84%
United UA 4706 IDA 07:00 → DEN Delta DL 1553 DEN 12:45 → SLC Connection details →	3h 50m	7h 18m	98%	81%
Alaska AS 3489 IDA 13:43 → SEA Delta DL 1165 SEA 17:59 → SLC Connection details →	3h 11m	7h 26m	100%	80%

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