Best Time to Fly BWI to SFO: On-Time Stats by Hour & Airline
Baltimore/Washington International Thurgood Marshall → San Francisco International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 69.6% of Baltimore (BWI) to San Francisco (SFO) flights arrived on time (1,054 scheduled flights). That is 8.0 points below the national average of 77.6%.
Among 2 airlines, United Airlines led with 77.5% on time and Southwest Airlines was last with 54.7%.
Over 24 months, Saturday was the most reliable day (82% on time) and June the worst month (60%).
The cancellation rate was 0.8% (US average 1.8%).
BWI to SFO 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 | 77.5% | 51 min | 0.9% | 689 |
| Southwest Airlines | 54.7% | 55 min | 0.8% | 365 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BWI to SFO
On-time arrival % by scheduled departure hour (local time), 1,720 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 89.5% | 0.7% | 427 |
| 7am–8am | Limited data | 21 | |
| 8am–9am | 87.7% | 0.8% | 263 |
| 9am–10am | 97.3% | 0.9% | 111 |
| 10am–11am | 79.0% | 0.0% | 82 |
| 11am–12pm | 76.7% | 0.0% | 30 |
| 12pm–1pm | 56.1% | 0.0% | 57 |
| 2pm–3pm | 31.4% | 0.0% | 35 |
| 3pm–4pm | 65.2% | 0.0% | 46 |
| 4pm–5pm | Limited data | 7 | |
| 5pm–6pm | 41.7% | 0.0% | 60 |
| 6pm–7pm | 66.0% | 1.6% | 386 |
| 7pm–8pm | 65.9% | 0.8% | 130 |
| 8pm–9pm | 39.7% | 3.1% | 65 |
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 SFO
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) | 76.5% | -3.0 pts | 0.0% | 34 |
| Christmas & New Year (Dec 20 - Jan 3) | 66.0% | -13.4 pts | 0.0% | 55 |
| Summer peak (Jun 15 - Aug 15) | 63.1% | -16.4 pts | 1.0% | 386 |
| All other days | 79.5% | — | 0.9% | 1,245 |
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).