Airports › Boise (BOI) › August 2025
Airport month · August 2025
Boise Air Terminal in August 2025
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 2025, reporting carriers scheduled 2,025 domestic departures from Boise Air Terminal (BOI). 84.9% left less than 15 minutes late and 82.5% reached their destination on time; 0.2% were cancelled.
Nationally that month, 76.8% of flights departed on time and 76.3% arrived on time, so BOI departures were 8.1 points above the national departure figure.
A year earlier, in August 2024, the airport had 2,097 departures with 84.6% leaving on time: a change of +0.3 points, with flights down 3%.
Flights arriving at BOI that month were on time 80.4% of the time (2,027 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 37%, national aviation system 32% and air carrier 30%.
- On time 82.5%
- Arrived 15+ minutes late 16.5%
- Cancelled 0.2%
- Diverted 0.7%
August 2025 against a year earlier, the airport's year and the nation
| Measure | Aug 2025 | Aug 2024 | BOI, 12 months to Jul 2026 | All reported flights, Aug 2025 |
|---|---|---|---|---|
| Departed on time | 84.9% | 84.6% | 83.9% | 76.8% |
| Arrived on time | 82.5% | 82.5% | 82.9% | 76.3% |
| Cancelled | 0.2% | 0.4% | 0.5% | 1.1% |
| Average departure delay (late minutes only) | 10.9 min | 10.2 min | 12.2 min | 17.6 min |
| Scheduled departures a day | 68 | 70 | 65 | 20,079 |
| Scheduled departures | 2,025 | 2,097 | 23,701 | 602,378 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| OO SkyWest Airlines | 918 | 45% | 86.6% | -1.6 min | 0.0% |
| WN Southwest Airlines | 439 | 22% | 80.9% | 4.0 min | 0.0% |
| DL Delta Air Lines | 238 | 12% | 87.8% | -2.6 min | 0.4% |
| UA United Airlines | 171 | 8% | 72.5% | 14.5 min | 1.2% |
| AS Alaska Airlines | 112 | 6% | 80.4% | 5.2 min | 0.0% |
| AA American Airlines | 93 | 5% | 66.7% | 35.2 min | 2.2% |
| G4 Allegiant Air | 23 | 1% | 73.9% | 31.6 min | 0.0% |
| NK Spirit Airlines | 15 | 1% | 60.0% | 32.3 min | 0.0% |
| F9 Frontier Airlines | 11 | 1% | 63.6% | 17.4 min | 0.0% |
| MQ Envoy Air | 5 | 0% | 60.0% | 11.4 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| BOI–SEA | Boise to Seattle | 349 | 81.7% | 2.1 min | 0.0% |
| BOI–DEN | Boise to Denver | 259 | 71.8% | 12.3 min | 0.4% |
| BOI–SLC | Boise to Salt Lake City | 155 | 91.0% | -3.5 min | 0.0% |
| BOI–PHX | Boise to Phoenix | 148 | 83.1% | 1.5 min | 0.0% |
| BOI–LAX | Boise to Los Angeles | 122 | 95.1% | -10.9 min | 0.0% |
| BOI–LAS | Boise to Las Vegas | 120 | 80.8% | 7.5 min | 0.0% |
| BOI–SFO | Boise to San Francisco | 116 | 87.9% | 2.9 min | 0.9% |
| BOI–PDX | Boise to Portland | 102 | 90.2% | -4.6 min | 0.0% |
| BOI–ORD | Boise to Chicago | 93 | 67.7% | 15.1 min | 0.0% |
| BOI–SAN | Boise to San Diego | 87 | 78.2% | 2.9 min | 0.0% |
| BOI–SMF | Boise to Sacramento | 74 | 83.8% | 1.7 min | 0.0% |
| BOI–MSP | Boise to Minneapolis | 72 | 90.3% | -4.2 min | 0.0% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left BOI on time in August 2025?
84.9% of 2,025 scheduled domestic departures left less than 15 minutes late, and 82.5% reached their destination on time. The national figures that month were 76.8% and 76.3%.
How does that compare with a year earlier?
In August 2024, 84.6% of 2,097 departures left on time and 0.4% were cancelled, against 84.9% and 0.2% in August 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for August 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.