Best Time to Fly SAN to BWI: On-Time Stats by Hour & Airline
San Diego International → Baltimore/Washington International Thurgood Marshall
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 78.0% of San Diego (SAN) to Baltimore (BWI) flights arrived on time (1,160 scheduled flights). That is in line with the national average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Saturday was the most reliable day (88% on time) and July the worst month (65%).
The cancellation rate was 1.6% (US average 1.8%).
SAN 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 | 78.0% | 45 min | 1.6% | 1,160 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SAN to BWI
On-time arrival % by scheduled departure hour (local time), 2,085 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 90.5% | 1.6% | 430 |
| 7am–8am | 88.1% | 0.0% | 186 |
| 8am–9am | 84.2% | 0.0% | 38 |
| 9am–10am | Limited data | 15 | |
| 10am–11am | 87.9% | 3.3% | 60 |
| 11am–12pm | 70.6% | 1.4% | 212 |
| 12pm–1pm | 67.2% | 0.0% | 198 |
| 1pm–2pm | 50.8% | 1.5% | 133 |
| 2pm–3pm | 58.1% | 3.4% | 89 |
| 3pm–4pm | 72.8% | 0.9% | 116 |
| 4pm–5pm | 67.9% | 1.2% | 82 |
| 5pm–6pm | Limited data | 13 | |
| 8pm–9pm | 85.2% | 0.0% | 61 |
| 9pm–10pm | 87.2% | 0.9% | 452 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SAN 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) | 88.6% | +6.1 pts | 0.0% | 35 |
| Christmas & New Year (Dec 20 - Jan 3) | 71.4% | -11.0 pts | 3.8% | 80 |
| Summer peak (Jun 15 - Aug 15) | 65.6% | -16.8 pts | 0.5% | 395 |
| All other days | 82.5% | — | 1.2% | 1,575 |
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).