Watertown Regional (ATY) Delays and On-Time Departures
Watertown, SD · ranked 31st of 333 airports for on-time departures
Data through July 2026 · Last updated October 18, 2026
86.1% of the 727 flights scheduled to depart Watertown (ATY) in the last 12 months left on time, 8.7 points above the US average of 77.4%.
That ranks 31st of 333 US airports tracked on this site, with 1.0% of departures cancelled.
Over 24 months, Tuesday was the most reliable day (92% on time) and August the worst month (69%).
Best time of day to fly out of Watertown (ATY)
On-time departure % by scheduled departure hour (local time), last 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 90.2% | 1.4% | 217 |
| 6am–7am | 93.7% | 2.1% | 145 |
| 7am–8am | Limited data | 1 | |
| 8am–9am | Limited data | 1 | |
| 11am–12pm | Limited data | 1 | |
| 2pm–3pm | Limited data | 1 | |
| 6pm–7pm | 80.8% | 0.3% | 360 |
| 11pm–12am | Limited data | 1 | |
Airlines at ATY ranked by on-time departures
Last 12 months. Airlines with fewer than 30 departures are marked “limited data”.
| Airline | On-time departures | On-time arrivals | Cancelled | Departures |
|---|---|---|---|---|
| SkyWest Airlines | 86.1% | 83.6% | 1.0% | 727 |
80%+ good 70–79.9% fair <70% poor
Best day to fly out of ATY
On-time departures by day, 24 months.
Best month to fly out of ATY
On-time departures by month, 24 months.
Holiday travel at Watertown (ATY)
On-time departures during holiday periods compared with all other days, last 24 months.
| Period | On-time departures | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 14 | ||
| Christmas & New Year (Dec 20 - Jan 3) | Limited data | 28 | ||
| Summer peak (Jun 15 - Aug 15) | 80.5% | -6.9 pts | 0.0% | 123 |
| All other days | 87.4% | — | 1.1% | 562 |
Monthly on-time departure trend at ATY
On-time departure % each month, with the 12-month US average for reference.
Routes from Watertown (ATY)
Every route from ATY with its own page, by number of flights (last 12 months, on-time arrivals).
| To | On time | Cancelled | Flights |
|---|---|---|---|
| ATY → Minneapolis (MSP) | 92.5% | 1.6% | 364 |
| ATY → Denver (DEN) | 74.7% | 0.3% | 363 |