Boise Air Terminal in March 2025

85.6%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 March 2025, reporting carriers scheduled 1,947 domestic departures from Boise Air Terminal (BOI). 85.6% left less than 15 minutes late and 84.4% reached their destination on time; 0.1% were cancelled.

Nationally that month, 79.9% of flights departed on time and 79.3% arrived on time, so BOI departures were 5.7 points above the national departure figure.

A year earlier, in March 2024, the airport had 1,723 departures with 87.8% leaving on time: a change of −2.2 points, with flights up 13%.

Flights arriving at BOI that month were on time 82.2% of the time (1,946 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 43%, late-arriving aircraft 31% and national aviation system 22%.

On time 84.4%
Arrived 15+ minutes late 15.3%
Cancelled 0.1%
Diverted 0.2%

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

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

Measure	Mar 2025	Mar 2024	BOI, 12 months to Jul 2026	All reported flights, Mar 2025
Departed on time	85.6%	87.8%	83.9%	79.9%
Arrived on time	84.4%	84.6%	82.9%	79.3%
Cancelled	0.1%	0.6%	0.5%	1.2%
Average departure delay (late minutes only)	10.1 min	7.6 min	12.2 min	14.9 min
Scheduled departures a day	65	57	65	20,029
Scheduled departures	1,947	1,723	23,701	600,872

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	957	49%	84.7%	0.2 min	0.0%
WN Southwest Airlines	435	22%	86.2%	-2.3 min	0.0%
DL Delta Air Lines	241	12%	82.2%	3.0 min	0.0%
UA United Airlines	117	6%	87.2%	0.3 min	0.0%
AS Alaska Airlines	72	4%	83.3%	0.2 min	1.4%
AA American Airlines	66	3%	83.3%	8.9 min	1.5%
G4 Allegiant Air	25	1%	64.0%	7.5 min	0.0%
NK Spirit Airlines	21	1%	76.2%	7.2 min	0.0%
MQ Envoy Air	13	1%	76.9%	4.1 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BOI–SEA	Boise to Seattle	334	86.2%	-1.6 min	0.3%
BOI–DEN	Boise to Denver	244	85.7%	3.5 min	0.0%
BOI–PHX	Boise to Phoenix	199	81.4%	4.4 min	0.0%
BOI–SLC	Boise to Salt Lake City	138	89.1%	-7.6 min	0.0%
BOI–LAS	Boise to Las Vegas	129	79.8%	1.7 min	0.0%
BOI–SFO	Boise to San Francisco	124	78.2%	-2.4 min	0.0%
BOI–LAX	Boise to Los Angeles	123	95.1%	-11.3 min	0.0%
BOI–PDX	Boise to Portland	100	81.0%	5.2 min	0.0%
BOI–SMF	Boise to Sacramento	93	87.1%	2.2 min	0.0%
BOI–ORD	Boise to Chicago	63	88.9%	-4.4 min	0.0%
BOI–MSP	Boise to Minneapolis	62	74.2%	13.1 min	0.0%
BOI–DFW	Boise to Dallas/Fort Worth	61	83.6%	10.2 min	1.6%

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), March 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Mar 2025	Minutes
Air carrier	42.8%	33.0%	8,234
Late-arriving aircraft	31.0%	39.2%	5,965
National Aviation System	22.1%	21.9%	4,260
Extreme weather	3.5%	5.9%	675
Security	0.6%	0.1%	106

19,240 delay minutes on 298 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 March 2025?

85.6% of 1,947 scheduled domestic departures left less than 15 minutes late, and 84.4% reached their destination on time. The national figures that month were 79.9% and 79.3%.

How does that compare with a year earlier?

In March 2024, 87.8% of 1,723 departures left on time and 0.6% were cancelled, against 85.6% and 0.1% in March 2025.

Provenance

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