Best Time to Fly SLC to BOI: On-Time Stats by Hour & Airline
Salt Lake City International → Boise Air Terminal
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 86.7% of Salt Lake City (SLC) to Boise (BOI) flights arrived on time (1,741 scheduled flights). That is 9.1 points above the national average of 77.6%.
Among 2 airlines, SkyWest Airlines led with 91.9% on time and Delta Air Lines was last with 84.5%.
Over 24 months, Tuesday was the most reliable day (91% on time) and December the worst month (82%).
The cancellation rate was 0.8% (US average 1.8%).
SLC 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 | 91.9% | 52 min | 0.2% | 523 |
| Delta Air Lines | 84.5% | 60 min | 1.1% | 1,218 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SLC to BOI
On-time arrival % by scheduled departure hour (local time), 3,399 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 91.3% | 1.1% | 560 |
| 9am–10am | 89.5% | 0.0% | 152 |
| 10am–11am | 83.5% | 0.7% | 404 |
| 11am–12pm | 86.2% | 0.0% | 325 |
| 3pm–4pm | 88.8% | 0.8% | 477 |
| 4pm–5pm | 89.7% | 0.0% | 252 |
| 5pm–6pm | 85.2% | 0.0% | 183 |
| 6pm–7pm | Limited data | 4 | |
| 8pm–9pm | 88.7% | 0.0% | 275 |
| 9pm–10pm | 87.2% | 0.0% | 227 |
| 10pm–11pm | 77.5% | 0.9% | 318 |
| 11pm–12am | 79.5% | 0.9% | 222 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SLC 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) | 77.8% | -9.8 pts | 1.6% | 64 |
| Christmas & New Year (Dec 20 - Jan 3) | 80.8% | -6.8 pts | 2.2% | 134 |
| Summer peak (Jun 15 - Aug 15) | 84.0% | -3.6 pts | 0.8% | 597 |
| All other days | 87.5% | — | 0.3% | 2,604 |
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).