Denver (DEN) to Sun Valley/Hailey/Ketchum (SUN): On-Time Performance
Data through May 2026
The calendar drives reliability on DEN–SUN. November 2025 flights landed on schedule 97% of the time, but June 2025 dropped to 67% — a gap of 30 points. Across the full period the route averages 81% on-time against a national 78%. Morning departures also hold up better than evening ones (86% vs 74%), which matters most in the rough months.
- On-time
- 81%
- arrived <15 min late
- Avg delay
- 15 min
- completed flights
- Cancelled
- 0.4%
- Flights/day
- 1.7
- last 12 months
- Duration
- 2h 5m
- scheduled
- Distance
- 557 mi
Monthly on-time trend
Best time to fly from DEN to SUN
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 77% | 14 min |
| Tuesdaybest | 87% | 18 min |
| Wednesday | 84% | 9 min |
| Thursday | 82% | 14 min |
| Friday | 76% | 19 min |
| Saturday | 78% | 15 min |
| Sunday | 83% | 16 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 operations35%
- National airspace system25%
- Weather11%
Frequently asked questions
- How often are flights from DEN to SUN delayed?
- 19% of DEN–SUN 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.
- How long is the flight from DEN to SUN?
- The scheduled DEN–SUN flight time averages 2h 5m over 557 miles. Actual arrival times vary — flights on this route land 15+ minutes late 19% of the time.
- How often are DEN to SUN flights cancelled?
- 0.4% 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 SUN?
- June 2025 was the roughest month in this dataset, with only 67% of arrivals on time. The best was November 2025 at 97%. If your dates are flexible, that 30-point gap is worth planning around.
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Based on 1,231 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.