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 85% on time.

Nonstops


Alaska	SMF	BOI	1h 27m	93%	1.1%	365	Flying now
Southwest	SMF	BOI	1h 25m	82%	0.0%	860	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 (Boise is 1 h ahead of Sacramento). Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	SMF 05:10 → PHX 07:05WN 3815	1h 35m Phoenix	PHX 08:40 → BOI 11:45WN 4601	5h 35m	98%	92%
Delta Details →	SMF 05:30 → SLC 08:11DL 1526	2h 49m Salt Lake City	SLC 11:00 → BOI 12:15DL 1442	5h 47m	99%	91%
American Details →	SMF 06:00 → PHX 07:54AA 1867	2h 16m Phoenix	PHX 10:10 → BOI 13:27AA 4948 · flown by SkyWest	6h 27m	98%	91%
Alaska Details →	SMF 10:23 → SEA 12:22AS 1468	3h 23m Seattle	SEA 15:45 → BOI 18:11AS 2061 · flown by Horizon	6h 48m	98%	89%
Southwest Details →	SMF 06:15 → LAS 07:40WN 2178	55m Las Vegas	LAS 08:35 → BOI 11:25WN 2192	4h 10m	96%	88%
Delta Details →	SMF 07:52 → SEA 10:05DL 4075 · flown by SkyWest	2h 25m Seattle	SEA 12:30 → BOI 15:12DL 3959 · flown by SkyWest	6h 20m	98%	87%
Alaska Details →	SMF 11:46 → PDX 13:18AS 621	1h 40m Portland	PDX 14:58 → BOI 17:16AS 342	4h 30m	100%	86%
Delta Details →	SMF 11:34 → SEA 13:45DL 3881 · flown by SkyWest	2h 50m Seattle	SEA 16:35 → BOI 19:13DL 3688 · flown by SkyWest	6h 37m	99%	85%
Tight connection: often missed
Delta Details →	SMF 09:21 → LAX 10:58DL 3700 · flown by SkyWest	46m Los Angeles	LAX 11:44 → BOI 14:46DL 3773 · flown by SkyWest	4h 30m	73%	65%
United Details →	SMF 11:46 → SFO 12:53UA 5248 · flown by SkyWest	1h 01m San Francisco	SFO 13:54 → BOI 16:44UA 267	3h 58m	58%	35%
United Details →	SMF 19:03 → SFO 20:10UA 5961 · flown by SkyWest	49m San Francisco	SFO 20:59 → BOI 23:55UA 6027 · flown by SkyWest	3h 52m	29%	18%

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

LAX · 46m · leaves 09:21 27%

Afternoon and evening

PDX · 1h 04m · leaves 14:55 22%

PHX · 1h 00m · leaves 19:50 43%

SFO · 49m · leaves 19:03 71%

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 4909 SMF 06:40 → BUR Alaska AS 3209 BUR 11:00 → BOI Connection details →	3h 05m	6h 29m	100%	98%
Southwest WN 4099 SMF 05:20 → PDX Alaska AS 2089 PDX 10:30 → BOI Connection details →	3h 40m	6h 29m	100%	96%
Southwest WN 3815 SMF 05:10 → PHX American AA 4948 PHX 10:10 → BOI Connection details →	3h 05m	7h 17m	98%	91%

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