Best Time to Fly BOI to SLC: On-Time Stats by Hour & Airline
Boise Air Terminal → Salt Lake City International
Data through July 2026 · Last updated October 18, 2026
1,740 flights were scheduled from Boise (BOI) to Salt Lake City (SLC) in the last 12 months, and 91.3% of those that flew arrived on time, 13.7 points above the US average of 77.6%.
SkyWest Airlines was the most punctual of the 2 airlines on the route at 95.2%, while Delta Air Lines trailed at 89.7%.
May has been the best month (95% on time) and Monday the weakest day of the week (90%).
1.0% of flights were cancelled, versus 1.8% nationally.
BOI to SLC 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 | 95.2% | 51 min | 0.2% | 522 |
| Delta Air Lines | 89.7% | 89 min | 1.3% | 1,218 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BOI to SLC
On-time arrival % by scheduled departure hour (local time), 3,397 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 88.5% | 0.0% | 243 |
| 6am–7am | 89.2% | 1.2% | 479 |
| 7am–8am | Limited data | 8 | |
| 8am–9am | 96.1% | 0.0% | 337 |
| 10am–11am | 93.1% | 0.0% | 146 |
| 11am–12pm | 93.3% | 1.1% | 574 |
| 12pm–1pm | 90.4% | 0.4% | 251 |
| 1pm–2pm | 87.7% | 0.6% | 476 |
| 5pm–6pm | 91.0% | 0.8% | 380 |
| 6pm–7pm | 87.4% | 0.6% | 346 |
| 7pm–8pm | 90.4% | 0.0% | 136 |
| 8pm–9pm | Limited data | 21 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on BOI to SLC
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) | 91.9% | +1.1 pts | 3.1% | 64 |
| Christmas & New Year (Dec 20 - Jan 3) | 88.5% | -2.3 pts | 2.2% | 134 |
| Summer peak (Jun 15 - Aug 15) | 90.5% | -0.3 pts | 1.0% | 597 |
| All other days | 90.8% | — | 0.4% | 2,602 |
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).