Airport · BOI · Boise, Idaho

Boise, ID

Boise, ID posts above-median on-time performance among the 382 tracked U.S. airports, as a high-volume U.S. airport. According to the U.S. DOT Bureau of Transportation Statistics, drawn from 266,753 flights (2020–2025); its biggest delay driver is carrier.

Compiled by PlainFlights Editorial, Flight Performance Editorial Team

Data updated 2026-06-13

85.2%
On-time: Top 31%
on-time, US airports: 69 min
Delay when late: 0.55%
Cancelled

Key Performance Metrics

Total Flights

266,753

Best Month

Oct 94.8%

Worst Month

Dec 91.5%

Delayed

39,406

Cancelled

1,457

60-65%

1
65-70%

4
70-75%

9
75-80%

48
80-85%

192
85-90%

116
90-95%

12

What this shows BOI is marked in the 85-90% band.

Delay Cause Breakdown

Top delay cause: Carrier. Total delay minutes: 1,260,417.

Late Aircraft 33.3% (419,979 min)

Carrier 41.3% (521,109 min)

NAS (National Aviation System) 19.1% (240,735 min)

Weather 6.1% (76,290 min)

Security 0.2% (2,304 min)

Seasonal Performance Patterns

Monthly averages across all years of data. Best month: October (94.8% on-time). Most delays: December (91.5% on-time).

Month	Avg Flights	Avg Delayed	Avg Cancelled	On-Time %
December	3,710	733	40	91.5%
November	3,750	478	10	94.4%
October	3,925	484	10	94.8%
September	3,866	488	5	94.5%
August	4,046	643	13	93.2%
July	4,045	701	16	92.8%
June	3,722	689	14	92.4%
May	3,480	468	9	94.2%
April	3,382	409	51	94.8%
March	3,713	492	37	94.3%
February	3,273	454	18	94.1%
January	3,548	530	21	93.4%

Year-Over-Year Performance

Annual flight volume and on-time trends at BOI.

Year	Flights	Delayed	Cancelled	On-Time %
2025	47,053	3,420	106	92.7%
2024	45,723	3,316	135	92.7%
2023	42,266	2,810	126	93.4%
2022	52,106	3,464	309	93.4%
2021	49,952	2,850	282	94.3%
2020	29,653	1,023	499	96.6%

Cancellation & Diversion Analysis

Flight disruption statistics for Boise, ID.

Cancellation Rate

0.55%

1,457 of 266,753 flights

Diversion Rate

0.10%

257 of 266,753 flights

Delay Rate

14.8%

39,406 of 266,753 flights

Monthly Performance

Recent 24 months of flight data.

Period	Flights	Dep Delayed	Arr Delayed	Cancelled	Diverted
Dec 2025	4,024	356	466	12	6
Nov 2025	3,913	280	312	28	3
Oct 2025	4,018	257	329	4	3
Sep 2025	3,848	252	297	8	3
Aug 2025	4,052	301	392	5	15
Jul 2025	4,273	363	496	12	4
Jun 2025	4,147	353	478	12	7
May 2025	3,986	255	344	3	4
Apr 2025	3,854	236	328	0	4
Mar 2025	3,893	279	343	2	4
Feb 2025	3,366	253	364	11	0
Jan 2025	3,679	235	320	9	3
Dec 2024	3,940	345	431	18	4
Nov 2024	3,915	211	301	10	2
Oct 2024	3,984	196	265	1	0
Sep 2024	4,075	286	351	2	2
Aug 2024	4,197	315	426	8	4
Jul 2024	4,279	359	510	34	5
Jun 2024	4,125	360	516	10	4
May 2024	4,036	316	413	8	8
Apr 2024	3,573	235	255	0	1
Mar 2024	3,448	200	266	10	0
Feb 2024	2,960	191	239	7	7
Jan 2024	3,191	302	372	27	1

Top Routes from BOI

Busiest routes to and from Boise, ID.

Route	Flights	On-Time	Distance
SEA (Seattle) → BOI (Boise)	25,171	86%	399 mi
BOI (Boise) → SEA (Seattle)	24,617	86.9%	399 mi
BOI (Boise) → DEN (Denver)	14,565	84%	649 mi
DEN (Denver) → BOI (Boise)	14,552	77.6%	649 mi
BOI (Boise) → SLC (Salt Lake City)	10,117	90.1%	290 mi
SLC (Salt Lake City) → BOI (Boise)	10,115	88%	290 mi
BOI (Boise) → SFO (San Francisco)	9,544	83.7%	522 mi
SFO (San Francisco) → BOI (Boise)	9,544	84%	522 mi
BOI (Boise) → LAX (Los Angeles)	9,537	89.2%	674 mi
LAX (Los Angeles) → BOI (Boise)	9,438	87.2%	674 mi
PHX (Phoenix) → BOI (Boise)	9,070	81.5%	735 mi
BOI (Boise) → PHX (Phoenix)	9,042	84.9%	735 mi
LAS (Las Vegas) → BOI (Boise)	7,512	75.7%	519 mi
BOI (Boise) → LAS (Las Vegas)	7,482	82.1%	519 mi
BOI (Boise) → PDX (Portland)	5,804	89.1%	344 mi
PDX (Portland) → BOI (Boise)	5,377	87.3%	344 mi
ORD (Chicago) → BOI (Boise)	5,089	81.1%	1,437 mi
BOI (Boise) → DFW (Dallas/Fort Worth)	5,080	82.1%	1,272 mi
DFW (Dallas/Fort Worth) → BOI (Boise)	5,079	76.1%	1,272 mi
BOI (Boise) → ORD (Chicago)	5,058	84.7%	1,437 mi

Airports With a Similar On-Time Rate

Other U.S. airports nationwide whose on-time rate is closest to Boise, ID's 85.2%.

Mobile, AL

85.2% on-time 33,438 flights

Bloomington/Normal, IL

85.2% on-time 25,097 flights

Duluth, MN

85.2% on-time 23,374 flights

Abilene, TX

85.2% on-time 21,805 flights

Manhattan/Ft. Riley, KS

85.2% on-time 15,042 flights

Juneau, AK

85.3% on-time 52,533 flights

Other Airports in Idaho

Compare performance with other Idaho airports.

IDA 84.4%

Idaho Falls, ID

Idaho Falls · 43,233 flights

SUN 88.6%

Sun Valley/Hailey/Ketchum, ID

Sun Valley/Hailey/Ketchum · 22,928 flights

LWS 89.7%

Lewiston, ID

Lewiston · 10,808 flights

TWF 92.3%

Twin Falls, ID

Twin Falls · 8,708 flights

PIH 93.7%

Pocatello, ID

Pocatello · 7,786 flights

Keep exploring

More flight data around Boise, ID.

Idaho flight data

Statewide on-time and delay aggregates, plus every reporting airport in Idaho.

View ID data →

Airport rankings

See where BOI sits among U.S. airports on on-time rate and average delay.

Best on-time airports →

Compare airports

Put BOI head-to-head with another airport on delays and reliability.

Open comparison tool →

What the Data Says About BOI

Boise, ID in Boise, Idaho handled 266,753 flights in the Bureau of Transportation Statistics dataset between 2020 and 2025, posting a 85.2% on-time departure rate. Of those flights, 39,406 experienced delays, 1,457 were cancelled, and 257 were diverted. The cancellation rate works out to 0.55%, the diversion rate to 0.10%, and the average delay when departures run late is 69.4 minutes. These figures are the baseline for comparing BOI against other airports in the same state and nationally.

Breaking down what drives delays at BOI, Carrier leads the pack. Carrier accounts for 41.3% of total delay minutes, followed by Late Aircraft at 33.3% and NAS (National Aviation System) at 19.1%. Weather contributes 6.1% of delay minutes at this airport, while security holds the smallest share at 0.2%. Travelers often overestimate the weather share; the BTS categorization shows late-arriving aircraft and carrier operations as the larger contributors.

Seasonally, October runs the cleanest at BOI with a 94.8% on-time rate, while December is the roughest at 91.5% - a 3-point swing between best and worst month. Volume peaks in August, when average flights hit 4,046. The busiest route connecting BOI is to SEA (Seattle), with 25,171 flights at a 86% on-time rate. Combine these numbers - 85.2% on-time, 69.4-minute average delay, 0.55% cancellation rate, and you have a concrete picture of departure reliability at Boise, ID.

Frequently Asked Questions

What is the on-time performance rate at Boise, ID (BOI)? ▼

Boise, ID has an overall on-time departure rate of 85.2%. Out of 266,753 total flights tracked, 39,406 experienced delays and 1,457 were cancelled.

What is the most common cause of delays at BOI? ▼

The top delay cause at Boise, ID is Carrier. Carrier accounts for 41.3% of all delay minutes.

What is the average delay time at BOI? ▼

The average delay at Boise, ID is 69.4 minutes. This includes delays from carrier issues, weather, National Aviation System constraints, security, and late-arriving aircraft.

What is the best month to fly from BOI? ▼

Based on historical data, October has the best on-time performance at BOI with 94.8% of flights departing on time.

What is the worst month for delays at BOI? ▼

December tends to have the most delays at BOI, with an on-time rate of only 91.5%.

How many routes operate from BOI? ▼

Boise, ID serves at least 20 routes. The busiest route is SEA to BOI (Seattle - Boise) with 25,171 flights.

What is the cancellation rate at BOI? ▼

Boise, ID has a cancellation rate of 0.55%, based on 1,457 cancelled flights out of 266,753 total flights tracked.

Flight Guides

Data-driven guides to help you understand airport and flight performance.

Best & Worst Airlines for On-Time Performance

Which carriers consistently outperform peers

Why Flights Get Cancelled

Cancellation causes broken down by data

How to Choose Reliable Flight Routes

Use delay data to pick flights that arrive on time

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Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data (2020–2025). Statistics reflect cumulative performance across all available reporting periods. On-time rates exclude cancelled and diverted flights.

Read our methodology - how this data is sourced, computed, and verified.

Using BOI's data

An airport-level on-time rate is a starting point, not a guarantee for your specific flight.

Check the busiest route from BOI before you book a connection. See top routes
Travel in October rather than December if your dates are flexible. Seasonal patterns
Scores vary by airline and route within the same airport; check the specific carrier you're flying. Browse airlines

On-time rate reflects the BTS historical average across all reporting carriers at this airport, not any single flight or airline.

All airports → | Rankings →

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights Editorial

Source: U.S. Bureau of Transportation Statistics (BTS) Airline on-time performance and operational reliability · 2025 Accessed 2026-07-23

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. Airport figures are computed directly from BTS On-Time Performance data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.