Airports › Boise (BOI) › December 2025
Airport month · December 2025
Boise Air Terminal in December 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 December 2025, reporting carriers scheduled 2,012 domestic departures from Boise Air Terminal (BOI). 81.7% left less than 15 minutes late and 83.0% reached their destination on time; 0.6% were cancelled.
Nationally that month, 72.0% of flights departed on time and 71.9% arrived on time, so BOI departures were 9.7 points above the national departure figure.
A year earlier, in December 2024, the airport had 1,971 departures with 81.6% leaving on time: a change of +0.1 points, with flights up 2%.
Flights arriving at BOI that month were on time 76.2% of the time (2,012 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 38%, air carrier 35% and national aviation system 22%.
- On time 83.0%
- Arrived 15+ minutes late 16.1%
- Cancelled 0.6%
- Diverted 0.3%
December 2025 against a year earlier, the airport's year and the nation
| Measure | Dec 2025 | Dec 2024 | BOI, 12 months to Jul 2026 | All reported flights, Dec 2025 |
|---|---|---|---|---|
| Departed on time | 81.7% | 81.6% | 83.9% | 72.0% |
| Arrived on time | 83.0% | 80.4% | 82.9% | 71.9% |
| Cancelled | 0.6% | 0.9% | 0.5% | 1.5% |
| Average departure delay (late minutes only) | 12.6 min | 13.3 min | 12.2 min | 21.2 min |
| Scheduled departures a day | 67 | 66 | 65 | 19,410 |
| Scheduled departures | 2,012 | 1,971 | 23,701 | 582,304 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| OO SkyWest Airlines | 937 | 47% | 84.7% | 0.2 min | 0.3% |
| WN Southwest Airlines | 506 | 25% | 82.8% | -1.0 min | 0.2% |
| DL Delta Air Lines | 187 | 9% | 79.7% | 0.0 min | 3.2% |
| AS Alaska Airlines | 164 | 8% | 84.8% | -4.1 min | 1.2% |
| UA United Airlines | 66 | 3% | 84.8% | 1.0 min | 0.0% |
| AA American Airlines | 62 | 3% | 88.7% | -4.5 min | 0.0% |
| MQ Envoy Air | 42 | 2% | 52.4% | 21.9 min | 0.0% |
| G4 Allegiant Air | 36 | 2% | 69.4% | 8.2 min | 0.0% |
| F9 Frontier Airlines | 12 | 1% | 91.7% | -5.6 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| BOI–DEN | Boise to Denver | 258 | 85.3% | 2.9 min | 0.0% |
| BOI–SEA | Boise to Seattle | 238 | 86.6% | -5.6 min | 0.0% |
| BOI–PHX | Boise to Phoenix | 188 | 86.7% | -3.4 min | 0.0% |
| BOI–SFO | Boise to San Francisco | 153 | 71.2% | 16.7 min | 0.7% |
| BOI–SLC | Boise to Salt Lake City | 149 | 87.2% | -6.0 min | 2.7% |
| BOI–LAX | Boise to Los Angeles | 122 | 86.9% | -9.7 min | 1.6% |
| BOI–LAS | Boise to Las Vegas | 120 | 84.2% | -4.4 min | 0.0% |
| BOI–PDX | Boise to Portland | 105 | 84.8% | 1.6 min | 0.0% |
| BOI–ORD | Boise to Chicago | 104 | 71.2% | 8.2 min | 1.0% |
| BOI–SAN | Boise to San Diego | 94 | 79.8% | 2.2 min | 2.1% |
| BOI–SMF | Boise to Sacramento | 77 | 81.8% | 6.2 min | 0.0% |
| BOI–SJC | Boise to San Jose | 71 | 84.5% | -4.3 min | 0.0% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left BOI on time in December 2025?
81.7% of 2,012 scheduled domestic departures left less than 15 minutes late, and 83.0% reached their destination on time. The national figures that month were 72.0% and 71.9%.
How does that compare with a year earlier?
In December 2024, 81.6% of 1,971 departures left on time and 0.9% were cancelled, against 81.7% and 0.6% in December 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for December 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.