Airports › Boise (BOI) › May 2025
Airport month · May 2025
Boise Air Terminal in May 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 May 2025, reporting carriers scheduled 1,993 domestic departures from Boise Air Terminal (BOI). 87.1% left less than 15 minutes late and 85.7% reached their destination on time; 0.2% were cancelled.
Nationally that month, 76.7% of flights departed on time and 75.4% arrived on time, so BOI departures were 10.4 points above the national departure figure.
A year earlier, in May 2024, the airport had 2,016 departures with 83.9% leaving on time: a change of +3.2 points, with flights down 1%.
Flights arriving at BOI that month were on time 82.6% of the time (1,993 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, national aviation system 36%, late-arriving aircraft 35% and air carrier 24%.
- On time 85.7%
- Arrived 15+ minutes late 13.9%
- Cancelled 0.2%
- Diverted 0.2%
May 2025 against a year earlier, the airport's year and the nation
| Measure | May 2025 | May 2024 | BOI, 12 months to Jul 2026 | All reported flights, May 2025 |
|---|---|---|---|---|
| Departed on time | 87.1% | 83.9% | 83.9% | 76.7% |
| Arrived on time | 85.7% | 82.8% | 82.9% | 75.4% |
| Cancelled | 0.2% | 0.4% | 0.5% | 1.0% |
| Average departure delay (late minutes only) | 8.9 min | 9.9 min | 12.2 min | 17.5 min |
| Scheduled departures a day | 66 | 67 | 65 | 20,188 |
| Scheduled departures | 1,993 | 2,016 | 23,701 | 605,648 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| OO SkyWest Airlines | 910 | 46% | 89.9% | -4.8 min | 0.0% |
| WN Southwest Airlines | 462 | 23% | 84.2% | 1.9 min | 0.2% |
| DL Delta Air Lines | 254 | 13% | 89.4% | -4.8 min | 0.0% |
| UA United Airlines | 144 | 7% | 60.4% | 30.9 min | 0.0% |
| AS Alaska Airlines | 96 | 5% | 85.4% | 0.1 min | 0.0% |
| AA American Airlines | 62 | 3% | 83.9% | 8.4 min | 1.6% |
| MQ Envoy Air | 26 | 1% | 88.5% | -1.5 min | 0.0% |
| G4 Allegiant Air | 23 | 1% | 82.6% | -0.1 min | 0.0% |
| NK Spirit Airlines | 9 | 0% | 88.9% | -4.2 min | 0.0% |
| F9 Frontier Airlines | 7 | 0% | 42.9% | 36.5 min | 14.3% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| BOI–SEA | Boise to Seattle | 316 | 86.1% | -1.2 min | 0.0% |
| BOI–DEN | Boise to Denver | 259 | 69.1% | 18.8 min | 0.4% |
| BOI–PHX | Boise to Phoenix | 186 | 87.6% | -2.4 min | 0.0% |
| BOI–SLC | Boise to Salt Lake City | 148 | 93.9% | -8.0 min | 0.0% |
| BOI–SFO | Boise to San Francisco | 136 | 78.7% | 1.7 min | 0.0% |
| BOI–LAX | Boise to Los Angeles | 124 | 96.0% | -13.9 min | 0.0% |
| BOI–LAS | Boise to Las Vegas | 113 | 89.4% | -1.3 min | 0.0% |
| BOI–PDX | Boise to Portland | 96 | 94.8% | -7.1 min | 0.0% |
| BOI–SAN | Boise to San Diego | 93 | 90.3% | -1.6 min | 1.1% |
| BOI–SMF | Boise to Sacramento | 65 | 83.1% | 6.9 min | 0.0% |
| BOI–DFW | Boise to Dallas/Fort Worth | 62 | 83.9% | 8.4 min | 1.6% |
| BOI–MSP | Boise to Minneapolis | 62 | 90.3% | -7.2 min | 0.0% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left BOI on time in May 2025?
87.1% of 1,993 scheduled domestic departures left less than 15 minutes late, and 85.7% reached their destination on time. The national figures that month were 76.7% and 75.4%.
How does that compare with a year earlier?
In May 2024, 83.9% of 2,016 departures left on time and 0.4% were cancelled, against 87.1% and 0.2% in May 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for May 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.