Boise Air Terminal in December 2023

87.9%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 December 2023, reporting carriers scheduled 1,689 domestic departures from Boise Air Terminal (BOI). 87.9% left less than 15 minutes late and 85.8% reached their destination on time; 0.7% were cancelled.

Nationally that month, 83.1% of flights departed on time and 83.8% arrived on time, so BOI departures were 4.8 points above the national departure figure.

Flights arriving at BOI that month were on time 84.1% of the time (1,689 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 32%, national aviation system 27% and air carrier 24%.

On time 85.8%
Arrived 15+ minutes late 12.8%
Cancelled 0.7%
Diverted 0.6%

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

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

Measure	Dec 2023	Year earlier	BOI, 12 months to Jul 2026	All reported flights, Dec 2023
Departed on time	87.9%	—	83.9%	83.1%
Arrived on time	85.8%	—	82.9%	83.8%
Cancelled	0.7%	—	0.5%	0.4%
Average departure delay (late minutes only)	10.3 min	—	12.2 min	11.6 min
Scheduled departures a day	56	—	65	19,013
Scheduled departures	1,689	—	23,701	570,394

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	625	37%	81.3%	1.1 min	1.3%
WN Southwest Airlines	396	23%	87.4%	1.0 min	0.8%
DL Delta Air Lines	240	14%	93.3%	-8.5 min	0.0%
UA United Airlines	119	7%	87.4%	-2.1 min	0.8%
AA American Airlines	83	5%	90.4%	11.1 min	0.0%
MQ Envoy Air	75	4%	86.7%	9.6 min	0.0%
AS Alaska Airlines	62	4%	90.3%	-1.5 min	0.0%
NK Spirit Airlines	59	3%	86.4%	-1.8 min	0.0%
G4 Allegiant Air	30	2%	70.0%	10.1 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BOI–SEA	Boise to Seattle	273	85.7%	-7.8 min	1.1%
BOI–DEN	Boise to Denver	218	88.1%	0.6 min	0.0%
BOI–LAS	Boise to Las Vegas	166	83.1%	-0.1 min	0.6%
BOI–PHX	Boise to Phoenix	149	81.2%	8.4 min	0.0%
BOI–SFO	Boise to San Francisco	148	75.0%	11.8 min	1.4%
BOI–SLC	Boise to Salt Lake City	138	94.9%	-9.2 min	0.0%
BOI–DFW	Boise to Dallas/Fort Worth	83	90.4%	11.1 min	0.0%
BOI–LAX	Boise to Los Angeles	79	86.1%	1.7 min	3.8%
BOI–OAK	Boise to Oakland	65	90.8%	-1.1 min	3.1%
BOI–MSP	Boise to Minneapolis	62	91.9%	-5.8 min	0.0%
BOI–SMF	Boise to Sacramento	61	88.5%	2.4 min	0.0%
BOI–SAN	Boise to San Diego	48	75.0%	11.2 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), December 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2023	Minutes
Air carrier	23.6%	37.1%	3,824
Late-arriving aircraft	31.8%	38.8%	5,154
National Aviation System	26.9%	17.6%	4,372
Extreme weather	17.4%	6.2%	2,823
Security	0.3%	0.3%	54

16,227 delay minutes on 217 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 December 2023?

87.9% of 1,689 scheduled domestic departures left less than 15 minutes late, and 85.8% reached their destination on time. The national figures that month were 83.1% and 83.8%.

How does that compare with a year earlier?

December 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 December 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.