Best Time to Fly BOI to DEN: On-Time Stats by Hour & Airline
Boise Air Terminal → Denver International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 81.6% of Boise (BOI) to Denver (DEN) flights arrived on time (3,033 scheduled flights). That is 4.0 points above the national average of 77.6%.
SkyWest Airlines was the most punctual of the 4 airlines on the route at 86.0%, while Southwest Airlines trailed at 78.7%.
October has been the best month (88% on time) and Friday the weakest day of the week (78%).
0.1% of flights were cancelled, versus 1.8% nationally.
BOI to DEN 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 | 86.0% | 85 min | 0.0% | 900 |
| United Airlines | 80.9% | 91 min | 0.2% | 915 |
| Frontier Airlines | 80.8% | 108 min | 0.0% | 130 |
| Southwest Airlines | 78.7% | 55 min | 0.2% | 1,088 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BOI to DEN
On-time arrival % by scheduled departure hour (local time), 5,960 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 94.9% | 0.4% | 980 |
| 6am–7am | 93.3% | 0.0% | 497 |
| 7am–8am | 91.6% | 0.8% | 530 |
| 8am–9am | 80.9% | 1.5% | 133 |
| 9am–10am | 92.6% | 0.0% | 54 |
| 10am–11am | 88.0% | 0.2% | 968 |
| 11am–12pm | 85.4% | 0.0% | 281 |
| 12pm–1pm | 78.2% | 0.5% | 195 |
| 1pm–2pm | 83.9% | 0.0% | 151 |
| 2pm–3pm | 74.3% | 0.3% | 917 |
| 3pm–4pm | 76.3% | 0.0% | 118 |
| 4pm–5pm | 41.0% | 1.3% | 236 |
| 5pm–6pm | 66.9% | 0.1% | 861 |
| 6pm–7pm | Limited data | 25 | |
| 7pm–8pm | Limited data | 13 | |
| 8pm–9pm | Limited data | 1 | |
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 DEN
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) | 83.0% | -0.1 pts | 0.0% | 106 |
| Christmas & New Year (Dec 20 - Jan 3) | 84.6% | +1.5 pts | 0.0% | 247 |
| Summer peak (Jun 15 - Aug 15) | 75.8% | -7.4 pts | 1.0% | 1,036 |
| All other days | 83.1% | — | 0.2% | 4,571 |
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).