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

Connect in the morning. The same one-hour layover misses 5% of the time at 8 am and 16% of the time at 7 pm.

Nonstops


United	BOI	DEN	2h 05m	84%	0.1%	1,815	Flying now
Frontier	BOI	DEN	2h 11m	82%	0.0%	130	Flying now
Southwest	BOI	DEN	1h 55m	79%	0.2%	1,088	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.


Southwest Details →	BOI 06:30 → SMF 06:55WN 715	3h 20m Sacramento	SMF 10:15 → DEN 13:35WN 3774	7h 05m	100%	96%
Alaska Details →	BOI 05:57 → PDX 06:17AS 1566	1h 03m Portland	PDX 07:20 → DEN 11:03AS 401	5h 06m	94%	92%
United Details →	BOI 07:00 → LAX 08:33UA 4730 · flown by SkyWest	2h 22m Los Angeles	LAX 10:55 → DEN 14:27UA 2061	7h 27m	99%	90%
Southwest Details →	BOI 06:00 → LAS 06:45WN 701	2h 10m Las Vegas	LAS 08:55 → DEN 11:50WN 247	5h 50m	100%	87%
Alaska Details →	BOI 06:23 → SEA 07:00AS 423	1h 04m Seattle	SEA 08:04 → DEN 11:56AS 375	5h 33m	100%	87%
Delta Details →	BOI 08:25 → SLC 09:44DL 3607 · flown by SkyWest	3h 36m Salt Lake City	SLC 13:20 → DEN 14:56DL 1623	6h 31m	100%	85%
Delta Details →	BOI 06:00 → SLC 07:11DL 2173	3h 04m Salt Lake City	SLC 10:15 → DEN 11:53DL 1553	5h 53m	98%	81%
Delta Details →	BOI 06:43 → SEA 07:35DL 3775 · flown by SkyWest	55m Seattle	SEA 08:30 → DEN 12:18DL 1358	5h 35m	95%	80%
Tight connection: often missed
United Details →	BOI 10:35 → SFO 11:35UA 4733 · flown by SkyWest	1h 08m San Francisco	SFO 12:43 → DEN 16:35UA 540	6h 00m	75%	58%
Alaska Details →	BOI 10:00 → SEA 10:34AS 2166 · flown by Horizon	1h 10m Seattle	SEA 11:44 → DEN 15:38AS 535	5h 38m	65%	51%
United Details →	BOI 19:05 → SFO 19:58UA 649	1h 02m San Francisco	SFO 21:00 → DEN 00:47 +1UA 301	5h 42m	25%	21%

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

SEA · 1h 04m · leaves 06:23 0%

PDX · 1h 03m · leaves 05:57 6%

SFO · 1h 01m · leaves 06:30 10%

Afternoon and evening

SEA · 1h 02m · leaves 18:10 16%

PHX · 1h 15m · leaves 17:55 36%

SFO · 1h 02m · leaves 19:05 75%

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 1566 BOI 05:57 → PDX United UA 2375 PDX 08:50 → DEN Connection details →	2h 33m	6h 27m	99%	96%
Southwest WN 715 BOI 06:30 → SMF United UA 2285 SMF 08:50 → DEN Connection details →	1h 55m	5h 46m	95%	93%
Alaska AS 2156 BOI 07:04 → SMF Southwest WN 3774 SMF 10:15 → DEN Connection details →	2h 41m	6h 31m	97%	92%

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