Airports › Idaho
Airport · 12 months to July 2026
Boise Air Terminal: delays and on-time record
Boise, Idaho
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. Data through July 2026; this is a monthly history, not live airport status.
Reporting carriers scheduled 23,701 domestic departures from Boise Air Terminal (BOI), Boise, in the 12 months to July 2026: about 65 a day to 25 destinations.
83.9% of those flights left the gate less than 15 minutes late, 7.8 points above the national departure figure of 76.1%. Flights arriving at BOI were on time 80.2% of the time, 4.2 points above the national arrival figure of 76.0%.
0.5% of scheduled departures were cancelled (national: 1.8%), and the average departure delay, counting early and on-time departures as zero, was 12.2 min.
SkyWest Airlines is the largest reporting carrier at BOI with 44% of departures. Among carriers with at least 237 departures, Delta Air Lines had the highest on-time arrival share for its BOI departures (86.6%) and Envoy Air the lowest (68.9%).
On-time departures are down 1.7 points on the previous 12 months (85.6%).
Of the delay minutes that carriers assigned to a BTS cause category for flights leaving BOI, air carrier 36%, late-arriving aircraft 34% and national aviation system 24%.
- On time 82.9%
- Arrived 15+ minutes late 16.3%
- Cancelled 0.5%
- Diverted 0.3%
As origin and as destination, against the nation
| Measure | Departures from BOI | Arrivals at BOI | All reported flights | BOI departures, previous 12 months |
|---|---|---|---|---|
| Departed on time (less than 15 min late) | 83.9% | 78.9% | 76.1% | 85.6% |
| Arrived on time | 82.9% | 80.2% | 76.0% | 83.8% |
| Cancelled | 0.5% | 0.5% | 1.8% | 0.4% |
| Diverted | 0.3% | 0.2% | 0.3% | 0.2% |
| Average departure delay (late minutes only) | 12.2 min | 13.1 min | 17.4 min | 10.0 min |
| Arrival delay minutes per 100 flights | 1,241 | 1,220 | 1,684 | 1,059 |
| Scheduled flights | 23,701 | 23,707 | 7,043,858 | 23,653 |
12 months to July 2026. The first column follows flights that left BOI; the second follows flights that landed there. Year on year, on-time departures moved −1.7 pts.
Airlines at BOI
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| OO SkyWest Airlines | 10,509 | 44% | 84.8% | 0.2 min | 0.4% |
| WN Southwest Airlines | 5,306 | 22% | 80.8% | 3.5 min | 0.2% |
| DL Delta Air Lines | 2,546 | 11% | 86.6% | -1.3 min | 1.1% |
| AS Alaska Airlines | 2,203 | 9% | 86.3% | -2.3 min | 0.6% |
| UA United Airlines | 1,392 | 6% | 77.2% | 13.2 min | 0.4% |
| AA American Airlines | 1,061 | 4% | 74.4% | 15.1 min | 2.4% |
| MQ Envoy Air | 273 | 1% | 68.9% | 19.4 min | 0.0% |
| G4 Allegiant Air | 242 | 1% | 71.5% | 19.7 min | 0.4% |
| F9 Frontier Airlines | 130 | 1% | 80.8% | 10.0 min | 0.0% |
| NK Spirit Airlines | 39 | 0% | 61.5% | 21.8 min | 0.0% |
Departures from BOI by reporting carrier, ordered by flights; on time means the flight reached its destination less than 15 minutes late. Green is at or above the airport's overall share of 82.9%. Carriers fly different routes at different hours, so the rows are not a like-for-like test.
Busiest routes from BOI
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| BOI–SEA | Boise to Seattle | 3,761 | 84.8% | -2.5 min | 0.4% |
| BOI–DEN | Boise to Denver | 3,033 | 81.2% | 5.7 min | 0.1% |
| BOI–PHX | Boise to Phoenix | 2,014 | 83.1% | 3.1 min | 0.4% |
| BOI–SLC | Boise to Salt Lake City | 1,740 | 90.3% | -4.6 min | 1.0% |
| BOI–SFO | Boise to San Francisco | 1,716 | 67.8% | 17.2 min | 0.5% |
| BOI–LAX | Boise to Los Angeles | 1,373 | 92.6% | -5.7 min | 0.2% |
| BOI–LAS | Boise to Las Vegas | 1,363 | 80.9% | 3.6 min | 0.2% |
| BOI–ORD | Boise to Chicago | 1,111 | 73.8% | 13.0 min | 1.2% |
| BOI–PDX | Boise to Portland | 1,084 | 90.9% | -3.4 min | 0.6% |
| BOI–SAN | Boise to San Diego | 1,028 | 80.0% | 3.9 min | 0.6% |
| BOI–SMF | Boise to Sacramento | 860 | 84.7% | 1.3 min | 0.1% |
| BOI–DFW | Boise to Dallas/Fort Worth | 802 | 77.6% | 11.6 min | 3.1% |
| BOI–MSP | Boise to Minneapolis | 783 | 86.6% | -0.9 min | 0.5% |
| BOI–SJC | Boise to San Jose | 658 | 85.7% | 0.0 min | 0.2% |
| BOI–OAK | Boise to Oakland | 554 | 83.9% | 1.1 min | 0.0% |
| BOI–ATL | Boise to Atlanta | 545 | 82.9% | -1.5 min | 1.5% |
| BOI–BUR | Boise to Burbank | 430 | 85.3% | -1.7 min | 0.2% |
| BOI–SNA | Boise to Santa Ana | 359 | 80.5% | 7.5 min | 0.6% |
| BOI–GEG | Boise to Spokane | 296 | 90.5% | -1.4 min | 0.3% |
The 19 busiest of 25 routes with reported flights. Routes with at least 10 flights a month have their own page.
Month by month
By scheduled departure hour
Among hours with at least 474 departures, 5 am to 6 am had the highest on-time share (94.6% of 1,674 flights) and 7 pm to 8 pm the lowest (71.3% of 1,028).
Delay causes
Cancellations by reported reason (125 in the period): air carrier 32%, weather 55%, national aviation system 13%, security 0%.
Checkpoint volumes
TSA publishes daily checkpoint passenger counts for the country as a whole, not for BOI on its own. The national series through September 2026 is on the checkpoint volumes page.
Questions and answers
How often do flights leave BOI on time?
83.9% of the 23,701 scheduled domestic departures in the 12 months to July 2026 left less than 15 minutes late; the national figure was 76.1%. 0.5% were cancelled.
How often do flights arrive at BOI on time?
80.2% of 23,707 scheduled arrivals were on time by the BTS definition, against 76.0% nationally.
Which airline has the highest on-time share at BOI?
Counting departures from BOI and whether they reached their destination on time, Delta Air Lines had the highest share (86.6% of 2,546 flights), then Alaska Airlines (86.3%) and SkyWest Airlines (84.8%). Carriers fly different routes at different hours, so the figures are not a like-for-like test.
What causes delays at BOI?
For departures from BOI that reached their destination 15 or more minutes late, carriers attributed the delay minutes as follows: air carrier 36%, late-arriving aircraft 34%, national aviation system 24%, extreme weather 6%, security 0%.
What time of day has the highest on-time share at BOI?
Departures scheduled from 5 am to 6 am local time left on time 94.6% of the time, the highest of any hour with enough flights to compare; 7 pm to 8 pm was lowest at 71.3%.
Is it getting better?
On-time departures for the 12 months to July 2026 were 83.9%, down 1.7 points on the previous 12 months (85.6%). The monthly chart shows each of the last 36 months, and each month has its own page.
Does this page show today's delays at BOI?
No. BTS publishes on-time records about two months after the month ends, so this page is a monthly history through July 2026. For live conditions use the FAA airport status service or your airline.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987 to present), monthly files August 2023 to July 2026; airport name from the BTS airport lookup table. US government works in the public domain. Domestic scheduled flights by reporting carriers only: international flights, charters and smaller carriers are not in the source. Totals and averages only; no individual flight or aircraft is identified. See the methodology; report processing errors through corrections.