Best Time to Fly DEN to SAT: On-Time Stats by Hour & Airline
Denver International → San Antonio International
Data through July 2026 · Last updated October 18, 2026
3,043 flights were scheduled from Denver (DEN) to San Antonio (SAT) in the last 12 months, and 77.4% of those that flew arrived on time, in line with the US average of 77.6%.
United Airlines was the most punctual of the 3 airlines on the route at 83.5%, while Southwest Airlines trailed at 71.3%.
October has been the best month (85% on time) and Thursday the weakest day of the week (73%).
0.3% of flights were cancelled, versus 1.8% nationally.
DEN to SAT on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| United Airlines | 83.5% | 71 min | 0.2% | 1,203 |
| Frontier Airlines | 81.2% | 60 min | 0.3% | 385 |
| Southwest Airlines | 71.3% | 51 min | 0.3% | 1,436 |
| SkyWest Airlines | Limited data | 19 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly DEN to SAT
On-time arrival % by scheduled departure hour (local time), 6,122 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 85.7% | 0.0% | 35 |
| 6am–7am | 93.1% | 0.0% | 72 |
| 7am–8am | 88.3% | 0.8% | 242 |
| 8am–9am | 89.4% | 0.0% | 312 |
| 9am–10am | 87.5% | 0.1% | 934 |
| 10am–11am | 83.6% | 0.5% | 215 |
| 11am–12pm | 78.8% | 0.6% | 180 |
| 12pm–1pm | 85.4% | 0.0% | 213 |
| 1pm–2pm | 85.1% | 0.1% | 1,007 |
| 2pm–3pm | 70.8% | 0.0% | 137 |
| 3pm–4pm | 71.1% | 0.2% | 397 |
| 4pm–5pm | 67.2% | 0.0% | 306 |
| 5pm–6pm | 69.1% | 0.2% | 867 |
| 6pm–7pm | 71.0% | 0.0% | 169 |
| 7pm–8pm | 50.8% | 0.0% | 269 |
| 8pm–9pm | 65.3% | 1.4% | 558 |
| 9pm–10pm | 64.6% | 1.1% | 183 |
| 10pm–11pm | Limited data | 26 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on DEN to SAT
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 87.6% | +8.2 pts | 0.8% | 122 |
| Christmas & New Year (Dec 20 - Jan 3) | 82.7% | +3.3 pts | 0.0% | 306 |
| Summer peak (Jun 15 - Aug 15) | 64.4% | -15.0 pts | 0.5% | 1,122 |
| All other days | 79.4% | — | 0.3% | 4,572 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).