Boise Air Terminal in July 2025

82.5%departed on time

BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.

In July 2025, reporting carriers scheduled 2,136 domestic departures from Boise Air Terminal (BOI). 82.5% left less than 15 minutes late and 81.6% reached their destination on time; 0.6% were cancelled.

Nationally that month, 69.7% of flights departed on time and 69.0% arrived on time, so BOI departures were 12.8 points above the national departure figure.

A year earlier, in July 2024, the airport had 2,139 departures with 81.6% leaving on time: a change of +0.9 points, with flights down 0%.

Flights arriving at BOI that month were on time 76.2% of the time (2,137 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 38%, national aviation system 33% and air carrier 26%.

On time 81.6%
Arrived 15+ minutes late 17.6%
Cancelled 0.6%
Diverted 0.2%

Every scheduled departure from BOI in July 2025, judged by arrival at the destination.

July 2025 against a year earlier, the airport's year and the nation

Measure	Jul 2025	Jul 2024	BOI, 12 months to Jul 2026	All reported flights, Jul 2025
Departed on time	82.5%	81.6%	83.9%	69.7%
Arrived on time	81.6%	79.9%	82.9%	69.0%
Cancelled	0.6%	1.6%	0.5%	2.5%
Average departure delay (late minutes only)	11.7 min	13.5 min	12.2 min	24.3 min
Scheduled departures a day	71	71	65	21,048
Scheduled departures	2,136	2,139	23,701	631,428

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	939	44%	85.9%	-0.7 min	0.2%
WN Southwest Airlines	490	23%	79.8%	5.0 min	0.2%
DL Delta Air Lines	272	13%	86.4%	0.4 min	0.7%
UA United Airlines	185	9%	63.2%	23.2 min	1.6%
AA American Airlines	92	4%	80.4%	10.5 min	2.2%
AS Alaska Airlines	88	4%	87.5%	-6.0 min	1.1%
MQ Envoy Air	31	1%	64.5%	14.6 min	0.0%
G4 Allegiant Air	22	1%	50.0%	13.0 min	4.5%
F9 Frontier Airlines	9	0%	44.4%	138.4 min	0.0%
NK Spirit Airlines	8	0%	87.5%	-3.9 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BOI–SEA	Boise to Seattle	362	84.0%	-2.6 min	0.3%
BOI–DEN	Boise to Denver	261	69.0%	20.3 min	1.1%
BOI–PHX	Boise to Phoenix	154	85.1%	1.5 min	1.3%
BOI–SLC	Boise to Salt Lake City	149	96.0%	-5.5 min	0.0%
BOI–LAS	Boise to Las Vegas	127	82.7%	4.2 min	0.0%
BOI–LAX	Boise to Los Angeles	122	97.5%	-10.8 min	0.0%
BOI–SFO	Boise to San Francisco	119	73.9%	12.3 min	0.0%
BOI–ORD	Boise to Chicago	93	71.0%	13.1 min	0.0%
BOI–DFW	Boise to Dallas/Fort Worth	92	80.4%	10.5 min	2.2%
BOI–MSP	Boise to Minneapolis	92	89.1%	-3.7 min	1.1%
BOI–SAN	Boise to San Diego	91	86.8%	1.2 min	0.0%
BOI–PDX	Boise to Portland	89	93.3%	-3.0 min	0.0%

By scheduled departure hour

100

On-time share:under 62%6270768288% and over

Share of departures that left less than 15 minutes late, by scheduled hour (local time), July 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Jul 2025	Minutes
Air carrier	25.9%	31.1%	6,035
Late-arriving aircraft	37.7%	40.8%	8,793
National Aviation System	33.2%	20.7%	7,756
Extreme weather	3.2%	7.3%	739
Security	0.1%	0.1%	15

23,338 delay minutes on 377 flights that arrived 15 or more minutes late and carried a cause report. Carriers assign the categories; see what each category means.

Questions and answers

How many flights left BOI on time in July 2025?

82.5% of 2,136 scheduled domestic departures left less than 15 minutes late, and 81.6% reached their destination on time. The national figures that month were 69.7% and 69.0%.

How does that compare with a year earlier?

In July 2024, 81.6% of 2,139 departures left on time and 1.6% were cancelled, against 82.5% and 0.6% in July 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for July 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for BOI · methodology · corrections.