Best Time to Fly SFO to BWI: On-Time Stats by Hour & Airline
San Francisco International → Baltimore/Washington International Thurgood Marshall
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 81.0% of San Francisco (SFO) to Baltimore (BWI) flights arrived on time (1,053 scheduled flights). That is 3.3 points above the national average of 77.6%.
United Airlines was the most punctual of the 2 airlines on the route at 89.6%, while Southwest Airlines trailed at 64.6%.
March has been the best month (91% on time) and Thursday the weakest day of the week (79%).
0.6% of flights were cancelled, versus 1.8% nationally.
SFO 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 |
|---|---|---|---|---|
| United Airlines | 89.6% | 50 min | 0.4% | 688 |
| Southwest Airlines | 64.6% | 48 min | 0.8% | 365 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SFO to BWI
On-time arrival % by scheduled departure hour (local time), 1,720 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 93.1% | 1.0% | 103 |
| 9am–10am | 87.2% | 0.4% | 485 |
| 1pm–2pm | 77.8% | 0.0% | 36 |
| 8pm–9pm | Limited data | 16 | |
| 9pm–10pm | 71.5% | 0.7% | 615 |
| 10pm–11pm | 87.9% | 1.3% | 234 |
| 11pm–12am | 87.4% | 0.4% | 231 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SFO 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) | 91.2% | +7.0 pts | 0.0% | 34 |
| Christmas & New Year (Dec 20 - Jan 3) | 65.5% | -18.8 pts | 0.0% | 55 |
| Summer peak (Jun 15 - Aug 15) | 75.6% | -8.6 pts | 1.0% | 385 |
| All other days | 84.2% | — | 0.6% | 1,246 |
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).