Boise Air Terminal in September 2024

85.9%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 September 2024, reporting carriers scheduled 2,038 domestic departures from Boise Air Terminal (BOI). 85.9% left less than 15 minutes late and 85.5% reached their destination on time; 0.1% were cancelled.

Nationally that month, 84.4% of flights departed on time and 83.9% arrived on time, so BOI departures were 1.5 points above the national departure figure.

A year earlier, in September 2023, the airport had 1,808 departures with 89.5% leaving on time: a change of −3.6 points, with flights up 13%.

Flights arriving at BOI that month were on time 82.6% of the time (2,037 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 39%, late-arriving aircraft 36% and national aviation system 19%.

On time 85.5%
Arrived 15+ minutes late 14.3%
Cancelled 0.1%
Diverted 0.1%

Every scheduled departure from BOI in September 2024, judged by arrival at the destination.

September 2024 against a year earlier, the airport's year and the nation

Measure	Sep 2024	Sep 2023	BOI, 12 months to Jul 2026	All reported flights, Sep 2024
Departed on time	85.9%	89.5%	83.9%	84.4%
Arrived on time	85.5%	88.0%	82.9%	83.9%
Cancelled	0.1%	0.2%	0.5%	0.6%
Average departure delay (late minutes only)	8.9 min	7.4 min	12.2 min	10.6 min
Scheduled departures a day	68	60	65	19,421
Scheduled departures	2,038	1,808	23,701	582,622

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	1,116	55%	83.5%	2.1 min	0.1%
WN Southwest Airlines	408	20%	87.5%	-0.4 min	0.0%
DL Delta Air Lines	239	12%	90.4%	-4.5 min	0.0%
UA United Airlines	120	6%	92.5%	-6.5 min	0.8%
AA American Airlines	76	4%	84.2%	2.4 min	0.0%
NK Spirit Airlines	31	2%	80.6%	4.8 min	0.0%
AS Alaska Airlines	30	1%	80.0%	4.4 min	0.0%
G4 Allegiant Air	18	1%	77.8%	10.1 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BOI–SEA	Boise to Seattle	280	79.3%	5.8 min	0.0%
BOI–DEN	Boise to Denver	235	92.8%	-5.4 min	0.4%
BOI–LAX	Boise to Los Angeles	163	93.3%	-8.4 min	0.0%
BOI–PHX	Boise to Phoenix	163	81.6%	2.5 min	0.0%
BOI–PDX	Boise to Portland	144	86.8%	-0.3 min	0.0%
BOI–SFO	Boise to San Francisco	143	73.4%	6.4 min	0.0%
BOI–SLC	Boise to Salt Lake City	139	93.5%	-9.1 min	0.0%
BOI–LAS	Boise to Las Vegas	108	82.4%	3.2 min	0.0%
BOI–GEG	Boise to Spokane	105	81.9%	5.0 min	1.0%
BOI–SMF	Boise to Sacramento	89	87.6%	0.9 min	0.0%
BOI–MSP	Boise to Minneapolis	62	93.5%	0.4 min	0.0%
BOI–DFW	Boise to Dallas/Fort Worth	60	88.3%	-2.7 min	0.0%

By scheduled departure hour

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

Share of departures that left less than 15 minutes late, by scheduled hour (local time), September 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2024	Minutes
Air carrier	38.8%	38.6%	6,386
Late-arriving aircraft	35.5%	38.4%	5,855
National Aviation System	18.7%	18.2%	3,074
Extreme weather	7.1%	4.8%	1,163
Security	0.0%	0.1%	0

16,478 delay minutes on 291 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 September 2024?

85.9% of 2,038 scheduled domestic departures left less than 15 minutes late, and 85.5% reached their destination on time. The national figures that month were 84.4% and 83.9%.

How does that compare with a year earlier?

In September 2023, 89.5% of 1,808 departures left on time and 0.2% were cancelled, against 85.9% and 0.1% in September 2024.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2024; 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.