Best Time to Fly SAT to BWI: On-Time Stats by Hour & Airline
San Antonio International → Baltimore/Washington International Thurgood Marshall
Data through July 2026 · Last updated October 18, 2026
732 flights were scheduled from San Antonio (SAT) to Baltimore (BWI) in the last 12 months, and 81.2% of those that flew arrived on time, 3.5 points above the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
September has been the best month (93% on time) and Thursday the weakest day of the week (80%).
1.8% of flights were cancelled, versus 1.8% nationally.
SAT to BWI 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 | 81.2% | 54 min | 1.8% | 732 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SAT to BWI
On-time arrival % by scheduled departure hour (local time), 1,558 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 95.0% | 1.0% | 592 |
| 6am–7am | 95.8% | 2.0% | 99 |
| 7am–8am | Limited data | 9 | |
| 8am–9am | Limited data | 13 | |
| 9am–10am | Limited data | 4 | |
| 10am–11am | 91.9% | 3.1% | 64 |
| 11am–12pm | 78.2% | 1.6% | 122 |
| 12pm–1pm | 90.0% | 0.0% | 30 |
| 1pm–2pm | Limited data | 19 | |
| 2pm–3pm | 85.0% | 0.0% | 41 |
| 3pm–4pm | 76.7% | 2.2% | 225 |
| 4pm–5pm | 65.8% | 0.6% | 183 |
| 5pm–6pm | 55.1% | 1.3% | 149 |
| 7pm–8pm | Limited data | 7 | |
| 8pm–9pm | Limited data | 1 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SAT to BWI
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) | 84.8% | -0.2 pts | 0.0% | 33 |
| Christmas & New Year (Dec 20 - Jan 3) | 84.6% | -0.4 pts | 1.3% | 79 |
| Summer peak (Jun 15 - Aug 15) | 75.7% | -9.3 pts | 3.0% | 329 |
| All other days | 85.0% | — | 1.0% | 1,117 |
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).