Best Time to Fly BWI to BOS: On-Time Stats by Hour & Airline
Baltimore/Washington International Thurgood Marshall → Logan International
Data through July 2026 · Last updated October 18, 2026
3,517 flights were scheduled from Baltimore (BWI) to Boston (BOS) in the last 12 months, and 75.0% of those that flew arrived on time, 2.6 points below the US average of 77.6%.
Among 3 airlines, Republic Airways led with 81.2% on time and Spirit Airlines was last with 71.1%.
Over 24 months, Wednesday was the most reliable day (81% on time) and May the worst month (69%).
The cancellation rate was 2.8% (US average 1.8%).
BWI to BOS 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 |
|---|---|---|---|---|
| Republic Airways | 81.2% | 81 min | 3.7% | 1,094 |
| Southwest Airlines | 72.3% | 61 min | 2.4% | 2,376 |
| Spirit Airlines | 71.1% | 43 min | 4.3% | 47 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BWI to BOS
On-time arrival % by scheduled departure hour (local time), 7,743 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 95.6% | 1.7% | 115 |
| 6am–7am | 94.4% | 1.8% | 839 |
| 7am–8am | 90.8% | 2.0% | 200 |
| 8am–9am | 93.8% | 0.8% | 648 |
| 9am–10am | 90.3% | 1.0% | 292 |
| 10am–11am | 89.0% | 1.3% | 786 |
| 11am–12pm | 87.3% | 0.5% | 214 |
| 12pm–1pm | 80.2% | 2.3% | 176 |
| 1pm–2pm | 64.2% | 1.4% | 434 |
| 2pm–3pm | 67.0% | 0.8% | 471 |
| 3pm–4pm | 73.9% | 1.8% | 675 |
| 4pm–5pm | 59.5% | 4.2% | 308 |
| 5pm–6pm | 59.7% | 2.8% | 470 |
| 6pm–7pm | 56.9% | 6.3% | 270 |
| 7pm–8pm | 69.2% | 3.2% | 769 |
| 8pm–9pm | 68.0% | 2.0% | 345 |
| 9pm–10pm | 62.5% | 2.6% | 383 |
| 10pm–11pm | 64.8% | 4.6% | 348 |
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 BOS
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) | 81.2% | +3.2 pts | 0.0% | 160 |
| Christmas & New Year (Dec 20 - Jan 3) | 76.1% | -2.0 pts | 3.0% | 267 |
| Summer peak (Jun 15 - Aug 15) | 70.2% | -7.9 pts | 4.4% | 1,395 |
| All other days | 78.0% | — | 1.6% | 5,921 |
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).