Boise (BOI) to Denver (DEN): On-Time Performance
Data through July 2026
Boise (BOI) to Denver (DEN) effectively runs on two schedules. In October 2024, 96% of arrivals were on time; in May 2025 that fell to 69% — a 27-point seasonal swing. Across the full period the route averages 82% on-time against a national 78%. Morning departures also hold up better than evening ones (91% vs 68%), which matters most in the rough months.
- On-time
- 82%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 0.4%
- Flights/day
- 8.3
- last 12 months
- Duration
- 1h 59m
- scheduled
- Distance
- 649 mi
Best airline from BOI to DEN
4 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 87% | 11 min | 0.2% | 1,584 |
| Southwest Airlines | 81% | 12 min | 0.2% | 2,267 |
| United Airlines | 80% | 18 min | 0.7% | 2,209 |
| Frontier Airlines | 73% | 31 min | 0.6% | 155 |
Monthly on-time trend
Best time to fly from BOI to DEN
Aim for departures around 5 a.m. (94% on-time); avoid 4 p.m. departures (43%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 83% | 12 min |
| Tuesday | 82% | 12 min |
| Wednesday | 83% | 12 min |
| Thursday | 80% | 18 min |
| Friday | 77% | 18 min |
| Saturdaybest | 86% | 11 min |
| Sunday | 82% | 15 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft29%
- Airline operations30%
- National airspace system37%
- Weather4%
Frequently asked questions
- How often are flights from BOI to DEN delayed?
- 18% of BOI–DEN flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 14 minutes.
- Which airline is most reliable from BOI to DEN?
- SkyWest Airlines has the best on-time record on this route at 87%, based on 1,584 flights. 4 airlines flew BOI–DEN frequently enough to compare in this period.
- What is the best time of day to fly from BOI to DEN?
- Departures around 5 a.m. have the best record (94% on-time), while departures around 4 p.m. have the worst (43%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BOI to DEN?
- The scheduled BOI–DEN flight time averages 1h 59m over 649 miles. Actual arrival times vary — flights on this route land 15+ minutes late 18% of the time.
- How often are BOI to DEN flights cancelled?
- 0.4% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from BOI to DEN?
- May 2025 was the roughest month in this dataset, with only 69% of arrivals on time. The best was October 2024 at 96%. If your dates are flexible, that 27-point gap is worth planning around.
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Based on 6,215 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.