Best Time to Fly BWI to SAT: On-Time Stats by Hour & Airline
Baltimore/Washington International Thurgood Marshall → San Antonio International
Data through July 2026 · Last updated October 18, 2026
732 flights were scheduled from Baltimore (BWI) to San Antonio (SAT) in the last 12 months, and 76.6% of those that flew arrived on time, 1.0 points below the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
November has been the best month (91% on time) and Saturday the weakest day of the week (71%).
1.6% of flights were cancelled, versus 1.8% nationally.
BWI 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 |
|---|---|---|---|---|
| Southwest Airlines | 76.6% | 55 min | 1.6% | 732 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BWI to SAT
On-time arrival % by scheduled departure hour (local time), 1,554 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | Limited data | 7 | |
| 7am–8am | Limited data | 20 | |
| 8am–9am | 90.1% | 0.6% | 354 |
| 9am–10am | 86.0% | 0.8% | 122 |
| 10am–11am | 86.6% | 1.8% | 114 |
| 11am–12pm | Limited data | 18 | |
| 12pm–1pm | 89.5% | 0.0% | 38 |
| 1pm–2pm | 76.9% | 0.0% | 65 |
| 2pm–3pm | 83.9% | 0.0% | 56 |
| 3pm–4pm | 63.9% | 0.0% | 97 |
| 4pm–5pm | Limited data | 9 | |
| 5pm–6pm | 68.8% | 2.0% | 50 |
| 6pm–7pm | 74.2% | 1.2% | 166 |
| 7pm–8pm | 66.9% | 2.4% | 168 |
| 8pm–9pm | 64.8% | 4.2% | 190 |
| 9pm–10pm | 60.3% | 1.7% | 59 |
| 10pm–11pm | Limited data | 21 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on BWI 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) | 90.9% | +11.0 pts | 0.0% | 33 |
| Christmas & New Year (Dec 20 - Jan 3) | 74.4% | -5.5 pts | 1.3% | 79 |
| Summer peak (Jun 15 - Aug 15) | 68.7% | -11.3 pts | 3.0% | 329 |
| All other days | 79.9% | — | 0.9% | 1,113 |
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).