Best time to fly out of Sioux City (SUX)
Sioux Gateway / Brigadier General Bud Day did not fly enough departures in this window to split the day into time bands. Not enough flights to say. A percentage needs at least 100 flights behind it before it is worth printing; anything thinner is noise wearing a decimal point. These are historical odds, not forecasts. The records say what happened on this schedule over three years; they know nothing about tomorrow’s thunderstorm.
Data through June 2026 · Bureau of Transportation Statistics
On-time rate by hour and day
On this page, “on time” means a departure that pushed back less than 15 minutes behind its scheduled time — the Bureau of Transportation Statistics definition, and the one airlines are held to.
| Departure time | Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|---|
| Before 6am | – | – | – | – | – | – | – |
| 6–8am | 81 | 88 | 88 | 83 | 86 | 78 | 82 |
| 8–10am | – | – | – | – | – | – | – |
| 10am–12pm | – | – | – | – | – | – | – |
| 12–2pm | – | – | – | – | – | – | – |
| 2–4pm | – | – | – | – | – | – | – |
| 4–6pm | – | – | – | – | – | – | – |
| 6–8pm | – | – | – | – | – | – | – |
| 8–10pm | – | – | – | – | – | – | – |
| 10pm–12am | – | – | – | – | – | – | – |
Not enough flights to say — fewer than 100 in this window.
The year at SUX
May was the hard month at SUX: 70.5% of departures left on time, across 204 flights. November was the easy one at 89.1%. Each month pools three years of that month, so a single bad week does not decide it.
| Month | Share departures that left on time | Flights |
|---|---|---|
| January | 77.2% | 211 |
| February | 84.8% | 197 |
| March | 80.3% | 217 |
| April | 79.5% | 197 |
| May | 70.5% | 204 |
| June | 72.1% | 197 |
| July | 70.7% | 186 |
| August | 70.9% | 186 |
| September | 83.3% | 180 |
| October | 86.6% | 186 |
| November | 89.1% | 177 |
| December | 80.9% | 184 |
Airlines at SUX
Every airline with at least 100 departures from SUX, busiest first. These are that airline’s departures from this airport only — its record across the country sits on its own page.
| Airline | Left on time | Typical delay | Cancelled | Departures |
|---|---|---|---|---|
| SkyWest Airlines | 78.7% | 123 min | 1.8% | 2,322 |
What delays out of SUX were put down to
Airlines file a reason with every arrival running 15 minutes late or more. Across 570 flights that departed SUX and ran 15 minutes late or more, the delay minutes break down with 45.8% put down to airline operations and 26.8% to late-arriving aircraft.
- Late-arriving aircraft 26.8%
- Airline operations 45.8%
- Air traffic & airport volume 16.5%
- Severe weather 11%
- Security 0%
Late-arriving aircraft is the knock-on category: the plane came in late, so it went out late again. It is why a 7am problem in Newark is still a problem in Denver at dinnertime, and why it is usually the biggest slice on the bar.
If you are connecting through SUX
Of 2,322 scheduled arrivals into SUX, 72.7% reached the gate less than 15 minutes behind schedule. Of the 556 arrivals that ran late, 50.9% were no more than 45 minutes behind — which is the difference between a tight connection and a new boarding pass.
Work out a specific layover — pick the airport and the minutes you have, and the tool reads the same arrival records back as a share.
Busiest routes out of SUX
Ranked by flights, with the share that arrived on time at the far end. Where a route carries enough flights for a page of its own the chip goes there; otherwise it goes to the destination airport.
SUX in one number
Sioux Gateway / Brigadier General Bud Day (SUX)
Rank 253 of 363 US airports by departures. Steadiest stretch of the day: 6–8am. Hardest month: May.
Questions about SUX
- What is the worst month to fly out of SUX?
- May: 70.5% of the departures that flew left on time, with 204 scheduled. November was the other end of the year at 89.1%. Each figure pools three years of that calendar month.
- How often are flights cancelled at SUX?
- 1.8% of scheduled departures were cancelled over July 2023 through June 2026. Cancellations are counted against everything scheduled, not against everything that flew — a rate that looks small still adds up to real people in a rebooking line.