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

No clear winner: Alaska’s SEA → IDA flights land within a few points of 82% on time whatever the hour.

Nonstops (seasonal or thin)


Alaska	SEA	IDA	1h 46m	82%	0.4%	721	Flying now

Best connections, any airlines

Most reliable Quickest (80%+ on time)

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


Delta Details →	SEA 07:15 → SLC 10:23DL 2858	3h 07m Salt Lake City	SLC 13:30 → IDA 14:37DL 3765 · flown by SkyWest	6h 22m	99%	91%
Delta Details →	SEA 05:30 → SLC 08:30DL 1128	1h 05m Salt Lake City	SLC 09:35 → IDA 10:43DL 3944 · flown by SkyWest	4h 13m	95%	89%
Delta Details →	SEA 11:05 → SLC 14:11DL 1265	2h 59m Salt Lake City	SLC 17:10 → IDA 18:18DL 3895 · flown by SkyWest	6h 12m	99%	87%
Alaska Details →	SEA 06:42 → PDX 07:37AS 2432 · flown by Horizon	2h 53m Portland	PDX 10:30 → IDA 13:06AS 3013 · flown by SkyWest	5h 24m	100%	83%
Delta + Unitedtwo ticketsDetails →	SEA 08:30 → DEN 12:18DL 1358	3h 17m Denver	DEN 15:35 → IDA 17:19UA 5322 · flown by SkyWest	7h 49m	99%	82%
Southwest + Unitedtwo ticketsDetails →	SEA 07:50 → DEN 11:25WN 3397	2h 25m Denver	DEN 13:50 → IDA 15:34UA 5950 · flown by SkyWest	6h 44m	98%	80%
Alaska + Deltatwo ticketsDetails →	SEA 14:45 → SLC 17:48AS 368	3h 42m Salt Lake City	SLC 21:30 → IDA 22:31DL 2608	6h 46m	95%	74%
United Details →	SEA 05:00 → DEN 08:43UA 2601	3h 02m Denver	DEN 11:45 → IDA 13:25UA 2383	7h 25m	99%	71%
Tight connection: often missed
United Details →	SEA 14:33 → DEN 18:22UA 333	58m Denver	DEN 19:20 → IDA 21:07UA 5989 · flown by SkyWest	5h 34m	63%	41%

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

SLC · 1h 05m · leaves 05:30 5%

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