Best Time to Fly BWI to BUF: On-Time Stats by Hour & Airline
Baltimore/Washington International Thurgood Marshall → Buffalo Niagara International
Data through July 2026 · Last updated October 18, 2026
1,748 flights were scheduled from Baltimore (BWI) to Buffalo (BUF) in the last 12 months, and 77.4% of those that flew arrived on time, in line with the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Wednesday was the most reliable day (81% on time) and July the worst month (68%).
The cancellation rate was 1.9% (US average 1.8%).
BWI to BUF 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 | 77.4% | 52 min | 1.9% | 1,748 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BWI to BUF
On-time arrival % by scheduled departure hour (local time), 3,418 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 89.5% | 0.8% | 375 |
| 7am–8am | 97.3% | 0.0% | 37 |
| 8am–9am | 87.0% | 0.0% | 46 |
| 9am–10am | 88.2% | 0.7% | 145 |
| 10am–11am | 87.9% | 1.0% | 409 |
| 11am–12pm | 89.2% | 0.0% | 223 |
| 12pm–1pm | 77.9% | 0.0% | 104 |
| 1pm–2pm | 69.9% | 2.2% | 181 |
| 2pm–3pm | 77.6% | 0.6% | 176 |
| 3pm–4pm | 73.7% | 1.1% | 277 |
| 4pm–5pm | 76.1% | 1.5% | 136 |
| 5pm–6pm | 65.4% | 2.7% | 220 |
| 6pm–7pm | 67.1% | 2.7% | 225 |
| 7pm–8pm | 65.0% | 2.4% | 126 |
| 8pm–9pm | 75.0% | 1.3% | 151 |
| 9pm–10pm | 61.3% | 2.9% | 275 |
| 10pm–11pm | 58.0% | 3.2% | 312 |
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 BUF
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) | 82.0% | +4.4 pts | 0.0% | 61 |
| Christmas & New Year (Dec 20 - Jan 3) | 68.7% | -8.9 pts | 4.3% | 138 |
| Summer peak (Jun 15 - Aug 15) | 69.1% | -8.5 pts | 3.4% | 597 |
| All other days | 77.6% | — | 1.0% | 2,622 |
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).