Boise Air Terminal in August 2023

82.7%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 August 2023, reporting carriers scheduled 1,777 domestic departures from Boise Air Terminal (BOI). 82.7% left less than 15 minutes late and 81.3% reached their destination on time; 0.5% were cancelled.

Nationally that month, 76.7% of flights departed on time and 76.9% arrived on time, so BOI departures were 6.0 points above the national departure figure.

Flights arriving at BOI that month were on time 77.3% of the time (1,776 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 41%, air carrier 35% and national aviation system 17%.

On time 81.3%
Arrived 15+ minutes late 18.0%
Cancelled 0.5%
Diverted 0.2%

Every scheduled departure from BOI in August 2023, judged by arrival at the destination.

August 2023 against a year earlier, the airport's year and the nation

Measure	Aug 2023	Year earlier	BOI, 12 months to Jul 2026	All reported flights, Aug 2023
Departed on time	82.7%	—	83.9%	76.7%
Arrived on time	81.3%	—	82.9%	76.9%
Cancelled	0.5%	—	0.5%	1.5%
Average departure delay (late minutes only)	12.1 min	—	12.2 min	17.3 min
Scheduled departures a day	59	—	65	20,100
Scheduled departures	1,777	—	23,701	602,987

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	738	42%	85.4%	2.6 min	0.3%
WN Southwest Airlines	370	21%	75.7%	9.2 min	0.3%
DL Delta Air Lines	283	16%	84.5%	4.2 min	1.1%
UA United Airlines	186	10%	79.0%	7.5 min	0.0%
AA American Airlines	117	7%	86.3%	0.3 min	0.0%
NK Spirit Airlines	31	2%	67.7%	12.0 min	3.2%
AS Alaska Airlines	27	2%	51.9%	32.9 min	0.0%
G4 Allegiant Air	25	1%	52.0%	17.6 min	4.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BOI–SEA	Boise to Seattle	350	81.7%	4.0 min	0.0%
BOI–DEN	Boise to Denver	213	77.5%	7.7 min	0.0%
BOI–SFO	Boise to San Francisco	155	85.2%	5.7 min	0.0%
BOI–LAS	Boise to Las Vegas	151	75.5%	8.6 min	0.7%
BOI–SLC	Boise to Salt Lake City	142	85.2%	6.0 min	0.7%
BOI–LAX	Boise to Los Angeles	111	86.5%	-0.5 min	0.9%
BOI–PHX	Boise to Phoenix	101	77.2%	10.0 min	1.0%
BOI–MSP	Boise to Minneapolis	93	90.3%	-3.1 min	2.2%
BOI–PDX	Boise to Portland	77	87.0%	5.0 min	1.3%
BOI–SJC	Boise to San Jose	72	94.4%	-1.2 min	0.0%
BOI–DFW	Boise to Dallas/Fort Worth	62	90.3%	-6.8 min	0.0%
BOI–SMF	Boise to Sacramento	58	72.4%	10.4 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), August 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2023	Minutes
Air carrier	35.3%	36.7%	7,270
Late-arriving aircraft	40.8%	42.2%	8,394
National Aviation System	17.3%	15.7%	3,563
Extreme weather	6.6%	5.1%	1,356
Security	0.1%	0.2%	13

20,596 delay minutes on 320 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 August 2023?

82.7% of 1,777 scheduled domestic departures left less than 15 minutes late, and 81.3% reached their destination on time. The national figures that month were 76.7% and 76.9%.

How does that compare with a year earlier?

August 2022 is outside the 36 months on file, or the airport had too few reported flights that month.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for August 2023; 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.