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 87% on time.

Nonstops (seasonal or thin)


Alaska	BOI	SJC	1h 55m	94%	0.3%	357	Flying now
Southwest	BOI	SJC	1h 45m	80%	0.0%	330	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach San Jose on time. Total trip = scheduled departure to arrival, layover included (San Jose is 1 h behind Boise). Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	BOI 05:18 → PHX 06:22WN 4470	3h 18m Phoenix	PHX 09:40 → SJC 11:35WN 3336	7h 17m	100%	96%
Alaska Details →	BOI 11:42 → SEA 12:16AS 2159 · flown by Horizon	2h 02m Seattle	SEA 14:18 → SJC 16:32AS 1366	5h 50m	100%	89%
Delta Details →	BOI 08:25 → SLC 09:44DL 3607 · flown by SkyWest	1h 56m Salt Lake City	SLC 11:40 → SJC 12:38DL 1254	5h 13m	98%	89%
Alaska Details →	BOI 05:57 → PDX 06:17AS 1566	58m Portland	PDX 07:15 → SJC 09:09AS 2080 · flown by Horizon	4h 12m	93%	86%
Delta Details →	BOI 06:43 → SEA 07:35DL 3775 · flown by SkyWest	50m Seattle	SEA 08:25 → SJC 10:49DL 3736 · flown by SkyWest	5h 06m	92%	84%
Delta Details →	BOI 11:55 → SEA 12:42DL 3678 · flown by SkyWest	2h 03m Seattle	SEA 14:45 → SJC 17:04DL 3897 · flown by SkyWest	6h 09m	98%	84%
Delta Details →	BOI 11:59 → SLC 13:14DL 1754	1h 57m Salt Lake City	SLC 15:11 → SJC 16:07DL 1260	5h 08m	94%	83%
Delta Details →	BOI 07:00 → LAX 08:28DL 3725 · flown by SkyWest	54m Los Angeles	LAX 09:22 → SJC 10:43DL 2965	4h 43m	92%	82%
Tight connection: often missed
Southwest Details →	BOI 19:40 → LAS 20:25WN 704	1h 30m Las Vegas	LAS 21:55 → SJC 23:25WN 660	4h 47m	67%	40%
American Details →	BOI 15:54 → DFW 20:15AA 1531	1h 09m Dallas-Fort Worth	DFW 21:24 → SJC 22:58AA 1940	8h 04m	71%	38%
Alaska Details →	BOI 20:00 → SAN 21:22AS 2342 · flown by Horizon	1h 02m San Diego	SAN 22:24 → SJC 23:54AS 1624	4h 54m	47%	37%

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 · 58m · leaves 05:57 7%

SEA · 50m · leaves 06:43 8%

LAX · 54m · leaves 07:00 8%

Afternoon and evening

PDX · 55m · leaves 16:23 17%

DFW · 1h 09m · leaves 15:54 29%

SAN · 1h 02m · leaves 20:00 53%

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 3480 BOI 08:03 → LAX Delta DL 3842 LAX 12:57 → SJC Connection details →	3h 27m	7h 16m	99%	90%
Alaska AS 1605 BOI 10:28 → SNA Southwest WN 3863 SNA 15:00 → SJC Connection details →	3h 15m	6h 52m	100%	86%
Delta DL 3750 BOI 10:36 → SEA Alaska AS 1366 SEA 14:18 → SJC Connection details →	2h 37m	6h 56m	97%	86%

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