Denver (DEN) to Boise (BOI): On-Time Performance
Data through May 2026
Denver (DEN) to Boise (BOI) effectively runs on two schedules. In October 2024, 88% of arrivals were on time; in June 2025 that fell to 62% — a 26-point seasonal swing. Across the full period the route averages 76% on-time against a national 78%. Morning departures also hold up better than evening ones (87% vs 66%), which matters most in the rough months.
- On-time
- 76%
- arrived <15 min late
- Avg delay
- 15 min
- completed flights
- Cancelled
- 0.3%
- Flights/day
- 8.3
- last 12 months
- Duration
- 2h 2m
- scheduled
- Distance
- 649 mi
Best airline from DEN to BOI
4 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 80% | 15 min | 0.3% | 1,515 |
| United Airlines | 78% | 14 min | 0.4% | 2,126 |
| Frontier Airlines | 78% | 12 min | 0.0% | 129 |
| Southwest Airlines | 72% | 15 min | 0.2% | 2,178 |
Monthly on-time trend
Best time to fly from DEN to BOI
Aim for departures around 7 a.m. (90% on-time); avoid 10 p.m. departures (55%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 76% | 14 min |
| Tuesday | 79% | 14 min |
| Wednesdaybest | 80% | 12 min |
| Thursday | 74% | 16 min |
| Friday | 73% | 17 min |
| Saturday | 76% | 14 min |
| Sunday | 77% | 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 aircraft50%
- Airline operations32%
- National airspace system15%
- Weather4%
Frequently asked questions
- How often are flights from DEN to BOI delayed?
- 24% of DEN–BOI flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 15 minutes.
- Which airline is most reliable from DEN to BOI?
- SkyWest Airlines has the best on-time record on this route at 80%, based on 1,515 flights. 4 airlines flew DEN–BOI frequently enough to compare in this period.
- What is the best time of day to fly from DEN to BOI?
- Departures around 7 a.m. have the best record (90% on-time), while departures around 10 p.m. have the worst (55%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from DEN to BOI?
- The scheduled DEN–BOI flight time averages 2h 2m over 649 miles. Actual arrival times vary — flights on this route land 15+ minutes late 24% of the time.
- How often are DEN to BOI flights cancelled?
- 0.3% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from DEN to BOI?
- June 2025 was the roughest month in this dataset, with only 62% of arrivals on time. The best was October 2024 at 88%. If your dates are flexible, that 26-point gap is worth planning around.
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Based on 5,948 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.