Best Time to Fly BWI to SAN: On-Time Stats by Hour & Airline
Baltimore/Washington International Thurgood Marshall → San Diego International
Data through July 2026 · Last updated October 18, 2026
1,159 flights were scheduled from Baltimore (BWI) to San Diego (SAN) in the last 12 months, and 75.5% of those that flew arrived on time, 2.1 points below the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Thursday was the most reliable day (79% on time) and June the worst month (60%).
The cancellation rate was 1.3% (US average 1.8%).
BWI to SAN 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 | 75.5% | 50 min | 1.3% | 1,159 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BWI to SAN
On-time arrival % by scheduled departure hour (local time), 2,064 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 87.2% | 0.6% | 316 |
| 7am–8am | 88.4% | 0.6% | 183 |
| 8am–9am | 85.4% | 0.6% | 159 |
| 9am–10am | 81.6% | 1.1% | 188 |
| 10am–11am | Limited data | 8 | |
| 11am–12pm | 80.3% | 2.6% | 78 |
| 12pm–1pm | 80.6% | 0.0% | 67 |
| 1pm–2pm | 68.6% | 0.0% | 51 |
| 2pm–3pm | 62.8% | 0.8% | 123 |
| 3pm–4pm | 56.5% | 1.2% | 86 |
| 4pm–5pm | 57.4% | 1.7% | 117 |
| 5pm–6pm | Limited data | 18 | |
| 6pm–7pm | 77.6% | 1.4% | 147 |
| 7pm–8pm | 71.4% | 0.4% | 231 |
| 8pm–9pm | 68.5% | 2.6% | 231 |
| 9pm–10pm | 44.8% | 3.3% | 61 |
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 SAN
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) | 71.4% | -6.9 pts | 0.0% | 35 |
| Christmas & New Year (Dec 20 - Jan 3) | 63.0% | -15.3 pts | 1.3% | 79 |
| Summer peak (Jun 15 - Aug 15) | 67.6% | -10.7 pts | 2.3% | 395 |
| All other days | 78.3% | — | 0.8% | 1,555 |
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).