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 3 in 4 on time.

Nonstops


United	BOI	ORD	3h 39m	83%	1.6%	733	Flying now
American	BOI	ORD	3h 47m	64%	0.3%	378	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Delta Details →	BOI 23:10 → ATL 05:16DL 635	2h 09m Atlanta	ATL 07:25 → ORD 08:35 +1DL 1178	8h 25m	95%	82%
United Details →	BOI 05:00 → DEN 07:05UA 5924 · flown by SkyWest	2h 30m Denver	DEN 09:35 → ORD 13:15UA 2329	7h 15m	98%	82%
United Details →	BOI 06:30 → DEN 08:29UA 1782	2h 46m Denver	DEN 11:15 → ORD 14:55UA 2865	7h 25m	98%	80%
Alaska Details →	BOI 20:47 → SEA 21:21AS 2352 · flown by Horizon	2h 56m Seattle	SEA 00:17 → ORD 06:20 +1AS 328	8h 33m	99%	79%
United Details →	BOI 19:05 → SFO 19:58UA 649	3h 32m San Francisco	SFO 23:30 → ORD 05:57 +1UA 368	9h 52m	92%	78%
Alaska Details →	BOI 20:28 → PDX 20:46AS 2371 · flown by Horizon	2h 13m Portland	PDX 22:59 → ORD 05:00 +1AS 376	7h 32m	92%	78%
United Details →	BOI 07:00 → LAX 08:33UA 4730 · flown by SkyWest	2h 12m Los Angeles	LAX 10:45 → ORD 17:04UA 2113	9h 04m	99%	77%
Alaska Details →	BOI 06:23 → SEA 07:00AS 423	1h 34m Seattle	SEA 08:34 → ORD 14:46AS 265	7h 23m	100%	76%
Tight connection: often missed
Alaska Details →	BOI 11:42 → SEA 12:16AS 2159 · flown by Horizon	54m Seattle	SEA 13:10 → ORD 19:21AS 410	6h 39m	71%	50%
United Details →	BOI 17:46 → DEN 19:45UA 2395	1h 20m Denver	DEN 21:05 → ORD 00:44 +1UA 2649	5h 58m	66%	44%
Alaska Details →	BOI 10:00 → SEA 10:34AS 2166 · flown by Horizon	55m Seattle	SEA 11:29 → ORD 17:38AS 346	6h 38m	29%	8%

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

DEN · 1h 06m · leaves 06:30 6%

SEA · 57m · leaves 08:42 16%

Afternoon and evening

MSP · 1h 08m · leaves 14:50 11%

DFW · 1h 01m · leaves 12:15 24%

DEN · 1h 20m · leaves 17:46 34%

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 3688 BOI 19:28 → SEA American AA 2881 SEA 23:56 → ORD Connection details →	3h 42m	9h 34m	100%	91%
Alaska AS 2180 BOI 18:51 → LAX United UA 353 LAX 22:35 → ORD Connection details →	2h 25m	9h 00m	100%	90%
Southwest WN 704 BOI 19:40 → LAS United UA 2102 LAS 23:30 → ORD Connection details →	3h 05m	8h 31m	97%	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