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

No clear winner: airlines and hours on this route all land within a few points of 4 in 5 on time.

Nonstops


United	IDA	DEN	1h 51m	81%	0.5%	1,690	Flying now
Allegiant	IDA	DEN	–	75%few flights	0.0%	9	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Delta Details →	IDA 06:00 → SLC 07:01DL 2335	3h 14m Salt Lake City	SLC 10:15 → DEN 11:53DL 1553	5h 53m	97%	80%
Delta Details →	IDA 11:25 → SLC 12:31DL 3944 · flown by SkyWest	49m Salt Lake City	SLC 13:20 → DEN 14:56DL 1623	3h 31m	90%	77%
Alaska Details →	IDA 13:43 → SEA 14:48AS 3489 · flown by SkyWest	1h 38m Seattle	SEA 16:26 → DEN 20:10AS 602	6h 27m	100%	75%
American Details →	IDA 07:00 → DFW 11:00AA 6466 · flown by SkyWest	2h 17m Dallas-Fort Worth	DFW 13:17 → DEN 14:21AA 420	7h 21m	96%	70%
Delta Details →	IDA 19:00 → SLC 20:09DL 3895 · flown by SkyWest	56m Salt Lake City	SLC 21:05 → DEN 22:40DL 1667	3h 40m	88%	70%
Delta Details →	IDA 15:22 → SLC 16:30DL 3765 · flown by SkyWest	2h 00m Salt Lake City	SLC 18:30 → DEN 20:02DL 1586	4h 42m	97%	68%
Alaska Details →	IDA 16:14 → PDX 16:50AS 3421 · flown by SkyWest	1h 14m Portland	PDX 18:04 → DEN 21:40AS 1627	5h 26m	77%	53%

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

SLC · 56m · leaves 19:00 12%

PDX · 1h 14m · leaves 16:14 23%

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 2335 IDA 06:00 → SLC United UA 2004 SLC 10:39 → DEN Connection details →	3h 38m	6h 24m	97%	87%
Delta DL 3895 IDA 19:00 → SLC Frontier F9 4252 SLC 22:50 → DEN Connection details →	2h 41m	5h 38m	97%	76%
Delta DL 3944 IDA 11:25 → SLC Frontier F9 3982 SLC 15:41 → DEN Connection details →	3h 10m	5h 56m	99%	76%

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