69% of flights from Sioux City to Denver arrived on time over the past 12 months. That is worse than the typical U.S. route. The 11 a.m. departures ran on time 87% of the time; the 6 p.m. ones 61%. 15% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for SUX → DEN: when a flight was late, it was under 45 minutes late 44% of the time. About 1 in 8 flights landed an hour or more late, and 1 in 21 three hours or more; 2.2% were cancelled outright.
- On time or early69%
- 15–30 min late8.4%
- 30–60 min late7.3%
- 1–2 hours late6.2%
- 2–3 hours late2.1%
- 3+ hours late4.9%
- Diverted0.0%
- Cancelled2.2%
Share of all 536 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| United Airlines | 536 | 69% | 2.2% | −2 min | 13.1% | +99 min | SkyWest |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at SUX). Delays build through the day as late planes knock on, so early flights usually do best.
Last flight of the day
On SUX → DEN, each airline's last flight of the day was cancelled 4.7% of the time, against 0.6% for its earlier flights (8.0× as often). It arrived 3+ hours late 7.0% of the time (earlier flights: 6.4%). It matters more than the numbers suggest. Miss an earlier flight and there's another one that evening; miss the last one and you're usually waiting until morning.
| Airline | Last departure | Last: cancelled | Last: 3h+ late | Earlier: cancelled | Next morning |
|---|---|---|---|---|---|
| United Airlines | 6:30 p.m. | 4.7% | 7.0% | 0.6% | first flight 11:32 a.m. |
Last flight = the airline's last scheduled departure on this route that day, on days it flies the route at least twice; past 12 months. Times are typical scheduled times over the latest three months.
If you need to be in DEN tonight, book an earlier flight so there's a backup if it's cancelled.
By month
Each calendar month pooled over 2023–2026. Best: February (76%). Worst: August (57%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 87 | — | — |
| Tuesday | 65 | — | — |
| Wednesday | 63 | — | — |
| Thursday | 85 | — | — |
| Friday | 86 | — | — |
| Saturday | 64 | — | — |
| Sunday | 86 | — | — |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: weather 11 · air traffic/airport 1
Month by month
Not enough months with data to draw a trend.
Questions
How often are flights from SUX to DEN on time?
69% of 536 scheduled flights from Sioux City, IA to Denver, CO arrived within 15 minutes of schedule between September 2025 and August 2026. 2.2% were cancelled.
What is the best time of day to fly SUX to DEN?
Flights scheduled to leave at 11 a.m. were the most reliable (87% on time). The 6 p.m. departures were the least (61%).
What month has the most delays from SUX to DEN?
August (57% on time). The best month is February (76%), over 2023–2026.
Is the last flight of the day from SUX to DEN more likely to be cancelled?
Yes. Each airline's last SUX–DEN flight of the day was cancelled 4.7% of the time over the past year, against 0.6% for its earlier flights. If the last flight is cancelled, the next one is usually the following morning.
Related
- DEN → SUX (return)
- Flights into Denver (DEN)
- United Airlines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.