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 78% on time.

Nonstops


Frontier	DEN	BOI	2h 00m	83%	0.0%	130	Flying now
United	DEN	BOI	2h 09m	80%	0.1%	1,818	Flying now
Southwest	DEN	BOI	2h 00m	73%	0.1%	1,089	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Southwest Details →	DEN 05:45 → LAS 06:40WN 3106	1h 55m Las Vegas	LAS 08:35 → BOI 11:25WN 2192	5h 40m	100%	91%
Delta Details →	DEN 05:40 → SLC 07:13DL 2544	3h 47m Salt Lake City	SLC 11:00 → BOI 12:15DL 1442	6h 37m	97%	89%
Delta Details →	DEN 07:30 → LAX 09:00DL 2002	2h 44m Los Angeles	LAX 11:44 → BOI 14:46DL 3773 · flown by SkyWest	7h 21m	97%	86%
American Details →	DEN 07:13 → PHX 08:08AA 1404	2h 02m Phoenix	PHX 10:10 → BOI 13:27AA 4948 · flown by SkyWest	6h 14m	93%	86%
Southwest Details →	DEN 06:15 → PHX 07:05WN 1675	1h 35m Phoenix	PHX 08:40 → BOI 11:45WN 4601	5h 30m	96%	86%
United Details →	DEN 15:43 → LAX 17:15UA 1195	1h 42m Los Angeles	LAX 18:57 → BOI 22:05UA 5363 · flown by SkyWest	6h 22m	94%	84%
Delta Details →	DEN 15:55 → SLC 17:34DL 1623	3h 12m Salt Lake City	SLC 20:46 → BOI 22:04DL 4446 · flown by SkyWest	6h 10m	96%	83%
Delta Details →	DEN 12:45 → SLC 14:18DL 1553	2h 17m Salt Lake City	SLC 16:35 → BOI 17:51DL 2920	5h 07m	98%	83%
Tight connection: often missed
Alaska Details →	DEN 12:55 → SEA 14:53AS 381	52m Seattle	SEA 15:45 → BOI 18:11AS 2061 · flown by Horizon	5h 16m	67%	60%
United Details →	DEN 11:21 → SFO 13:04UA 1561	50m San Francisco	SFO 13:54 → BOI 16:44UA 267	5h 23m	60%	37%
Southwest Details →	DEN 19:25 → SMF 20:55WN 136	55m Sacramento	SMF 21:50 → BOI 00:20 +1WN 3762	4h 50m	2%	1%

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

SAN · 50m · leaves 06:32 2%

DFW · 1h 01m · leaves 05:00 10%

SLC · 1h 02m · leaves 05:40 11%

Afternoon and evening

SEA · 1h 14m · leaves 18:15 24%

LAS · 1h 00m · leaves 20:35 56%

SMF · 55m · leaves 19:25 98%

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 1739 DEN 09:00 → SMF Alaska AS 2157 SMF 13:10 → BOI Connection details →	2h 45m	6h 35m	100%	91%
Frontier F9 3219 DEN 06:00 → SLC Delta DL 1442 SLC 11:00 → BOI Connection details →	3h 29m	6h 17m	99%	91%
Southwest WN 1568 DEN 07:50 → LAX Delta DL 3773 LAX 11:44 → BOI Connection details →	2h 24m	7h 01m	100%	89%

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