Best Time to Fly SEA to BOI: On-Time Stats by Hour & Airline
Seattle/Tacoma International → Boise Air Terminal
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 85.8% of Seattle (SEA) to Boise (BOI) flights arrived on time (3,881 scheduled flights). That is 8.2 points above the national average of 77.6%.
Among 2 airlines, SkyWest Airlines led with 87.2% on time and Alaska Airlines was last with 81.2%.
Over 24 months, Tuesday was the most reliable day (88% on time) and February the worst month (78%).
The cancellation rate was 0.2% (US average 1.8%).
SEA to BOI on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlines | 87.2% | 53 min | 0.2% | 2,958 |
| Alaska Airlines | 81.2% | 45 min | 0.3% | 923 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SEA to BOI
On-time arrival % by scheduled departure hour (local time), 7,667 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | Limited data | 29 | |
| 7am–8am | 91.6% | 0.1% | 790 |
| 8am–9am | 91.9% | 0.4% | 235 |
| 9am–10am | 85.7% | 0.8% | 247 |
| 10am–11am | 85.7% | 0.1% | 657 |
| 11am–12pm | 74.6% | 0.4% | 537 |
| 12pm–1pm | 81.5% | 0.0% | 499 |
| 1pm–2pm | 86.5% | 0.1% | 802 |
| 2pm–3pm | 78.2% | 0.0% | 261 |
| 3pm–4pm | 86.8% | 0.0% | 243 |
| 4pm–5pm | 85.5% | 0.2% | 445 |
| 5pm–6pm | 80.6% | 0.0% | 602 |
| 6pm–7pm | 83.0% | 0.9% | 344 |
| 7pm–8pm | 84.6% | 0.4% | 772 |
| 8pm–9pm | 73.9% | 0.4% | 450 |
| 9pm–10pm | 81.5% | 0.3% | 754 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SEA to BOI
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 82.0% | -2.8 pts | 0.0% | 133 |
| Christmas & New Year (Dec 20 - Jan 3) | 83.0% | -1.8 pts | 0.0% | 218 |
| Summer peak (Jun 15 - Aug 15) | 79.0% | -5.8 pts | 0.1% | 1,406 |
| All other days | 84.8% | — | 0.3% | 5,910 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).