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 → IDA flights land within a few points of 9 in 10 on time whatever the hour.

Nonstops


Delta	SLC	IDA	1h 04m	89%	0.4%	1,193	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Idaho Falls on time. Total trip = scheduled departure to arrival, layover included. Layovers up to 4 hours. Pick a connection for the details.


American Details →	SLC 05:00 → DFW 08:46AA 1214	1h 26m Dallas-Fort Worth	DFW 10:12 → IDA 12:23AA 6219 · flown by SkyWest	7h 23m	97%	85%
United Details →	SLC 05:15 → DEN 06:54UA 5683 · flown by SkyWest	1h 11m Denver	DEN 08:05 → IDA 09:50UA 5374 · flown by SkyWest	4h 35m	96%	84%
Alaska Details →	SLC 08:20 → PDX 09:26AS 3004 · flown by SkyWest	1h 04m Portland	PDX 10:30 → IDA 13:06AS 3013 · flown by SkyWest	4h 46m	97%	82%
United Details →	SLC 10:39 → DEN 12:24UA 2004	3h 11m Denver	DEN 15:35 → IDA 17:19UA 5322 · flown by SkyWest	6h 40m	100%	82%
United Details →	SLC 08:30 → DEN 10:27UA 5642 · flown by SkyWest	3h 23m Denver	DEN 13:50 → IDA 15:34UA 5950 · flown by SkyWest	7h 04m	98%	80%
Alaska Details →	SLC 16:00 → SEA 17:16AS 734	2h 34m Seattle	SEA 19:50 → IDA 22:39AS 3423 · flown by SkyWest	6h 39m	99%	77%
United Details →	SLC 07:00 → DEN 08:42UA 1232	3h 03m Denver	DEN 11:45 → IDA 13:25UA 2383	6h 25m	99%	71%
Alaska Details →	SLC 09:10 → SEA 10:35AS 3381 · flown by SkyWest	2h 10m Seattle	SEA 12:45 → IDA 15:37AS 3490 · flown by SkyWest	6h 27m	91%	66%

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%

DEN · 1h 11m · leaves 05:15 4%

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.


Southwest WN 3739 SLC 10:40 → DEN United UA 5322 DEN 15:35 → IDA Connection details →	3h 30m	6h 39m	100%	83%
Frontier F9 3862 SLC 08:16 → DEN United UA 5950 DEN 13:50 → IDA Connection details →	3h 49m	7h 18m	99%	81%
Delta DL 2817 SLC 15:14 → SEA Alaska AS 3423 SEA 19:50 → IDA Connection details →	3h 20m	7h 25m	98%	77%

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