Sioux City (SUX) to Denver (DEN): On-Time Performance
Data through May 2026
The calendar drives reliability on SUX–DEN. December 2024 flights landed on schedule 94% of the time, but June 2025 dropped to 30% — a gap of 64 points. Across the full period the route averages 67% on-time against a national 78%. Morning departures also hold up better than evening ones (75% vs 61%), which matters most in the rough months.
- On-time
- 67%
- arrived <15 min late
- Avg delay
- 34 min
- completed flights
- Cancelled
- 1.9%
- Flights/day
- 1.3
- last 12 months
- Duration
- 1h 49m
- scheduled
- Distance
- 466 mi
Monthly on-time trend
Best time to fly from SUX to DEN
Aim for departures around 3 p.m. (74% on-time); avoid 6 p.m. departures (59%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 59% | 41 min |
| Tuesdaybest | 76% | 27 min |
| Wednesday | 70% | 26 min |
| Thursday | 64% | 35 min |
| Friday | 64% | 41 min |
| Saturday | 68% | 45 min |
| Sunday | 69% | 24 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft30%
- Airline operations33%
- National airspace system25%
- Weather12%
Frequently asked questions
- How often are flights from SUX to DEN delayed?
- 33% of SUX–DEN 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 34 minutes.
- What is the best time of day to fly from SUX to DEN?
- Departures around 3 p.m. have the best record (74% on-time), while departures around 6 p.m. have the worst (59%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SUX to DEN?
- The scheduled SUX–DEN flight time averages 1h 49m over 466 miles. Actual arrival times vary — flights on this route land 15+ minutes late 33% of the time.
- How often are SUX to DEN flights cancelled?
- 1.9% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, slightly above the national rate of 1.6%.
- What is the worst month to fly from SUX to DEN?
- June 2025 was the roughest month in this dataset, with only 30% of arrivals on time. The best was December 2024 at 94%. If your dates are flexible, that 64-point gap is worth planning around.
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Based on 847 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.