Boise Air Terminal in April 2024

86.8%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 April 2024, reporting carriers scheduled 1,787 domestic departures from Boise Air Terminal (BOI). 86.8% left less than 15 minutes late and 85.2% reached their destination on time; 0.0% were cancelled.

Nationally that month, 80.5% of flights departed on time and 80.2% arrived on time, so BOI departures were 6.3 points above the national departure figure.

Flights arriving at BOI that month were on time 85.6% of the time (1,786 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 41%, late-arriving aircraft 26% and national aviation system 24%.

On time 85.2%
Arrived 15+ minutes late 14.7%
Cancelled 0.0%
Diverted 0.1%

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

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

Measure	Apr 2024	Year earlier	BOI, 12 months to Jul 2026	All reported flights, Apr 2024
Departed on time	86.8%	—	83.9%	80.5%
Arrived on time	85.2%	—	82.9%	80.2%
Cancelled	0.0%	—	0.5%	0.7%
Average departure delay (late minutes only)	9.0 min	—	12.2 min	14.2 min
Scheduled departures a day	60	—	65	19,406
Scheduled departures	1,787	—	23,701	582,185

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	914	51%	84.8%	2.3 min	0.0%
WN Southwest Airlines	354	20%	88.4%	-2.8 min	0.0%
DL Delta Air Lines	210	12%	88.1%	-1.8 min	0.0%
AA American Airlines	60	3%	71.7%	8.8 min	0.0%
MQ Envoy Air	60	3%	85.0%	5.8 min	0.0%
AS Alaska Airlines	59	3%	81.4%	4.9 min	0.0%
UA United Airlines	57	3%	86.0%	6.2 min	0.0%
NK Spirit Airlines	39	2%	79.5%	4.6 min	0.0%
G4 Allegiant Air	34	2%	82.4%	21.5 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BOI–SEA	Boise to Seattle	331	86.7%	2.2 min	0.0%
BOI–DEN	Boise to Denver	235	88.5%	0.0 min	0.0%
BOI–SLC	Boise to Salt Lake City	146	90.4%	-2.1 min	0.0%
BOI–LAS	Boise to Las Vegas	140	80.0%	9.6 min	0.0%
BOI–PHX	Boise to Phoenix	136	86.0%	2.3 min	0.0%
BOI–GEG	Boise to Spokane	104	93.3%	-2.5 min	0.0%
BOI–SFO	Boise to San Francisco	103	60.2%	17.6 min	0.0%
BOI–PDX	Boise to Portland	75	89.3%	-1.6 min	0.0%
BOI–LAX	Boise to Los Angeles	74	87.8%	-7.0 min	0.0%
BOI–DFW	Boise to Dallas/Fort Worth	60	71.7%	8.8 min	0.0%
BOI–MSP	Boise to Minneapolis	60	81.7%	3.1 min	0.0%
BOI–SMF	Boise to Sacramento	60	83.3%	0.7 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), April 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Apr 2024	Minutes
Air carrier	40.8%	33.6%	6,408
Late-arriving aircraft	26.1%	41.0%	4,097
National Aviation System	23.7%	20.0%	3,716
Extreme weather	9.3%	5.1%	1,463
Security	0.1%	0.2%	21

15,705 delay minutes on 263 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 April 2024?

86.8% of 1,787 scheduled domestic departures left less than 15 minutes late, and 85.2% reached their destination on time. The national figures that month were 80.5% and 80.2%.

How does that compare with a year earlier?

April 2023 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 April 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.