Best Time to Fly BWI to GSP: On-Time Stats by Hour & Airline
Baltimore/Washington International Thurgood Marshall → Greenville-Spartanburg International
Data through July 2026 · Last updated October 18, 2026
720 flights were scheduled from Baltimore (BWI) to Greer (GSP) in the last 12 months, and 81.7% of those that flew arrived on time, 4.0 points above the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
November has been the best month (89% on time) and Monday the weakest day of the week (74%).
1.5% of flights were cancelled, versus 1.8% nationally.
BWI to GSP 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 | 81.7% | 64 min | 1.5% | 720 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BWI to GSP
On-time arrival % by scheduled departure hour (local time), 1,416 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 92.0% | 0.7% | 457 |
| 9am–10am | 86.4% | 0.0% | 125 |
| 10am–11am | Limited data | 1 | |
| 11am–12pm | 83.7% | 0.0% | 147 |
| 3pm–4pm | Limited data | 8 | |
| 4pm–5pm | Limited data | 6 | |
| 5pm–6pm | Limited data | 2 | |
| 6pm–7pm | 76.5% | 3.1% | 224 |
| 7pm–8pm | 67.0% | 0.6% | 183 |
| 8pm–9pm | 63.2% | 1.9% | 213 |
| 9pm–10pm | 44.2% | 6.5% | 46 |
| 10pm–11pm | Limited data | 4 | |
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 GSP
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) | Limited data | 26 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 70.0% | -11.5 pts | 0.0% | 60 |
| Summer peak (Jun 15 - Aug 15) | 68.2% | -13.4 pts | 2.4% | 248 |
| All other days | 81.5% | — | 1.1% | 1,082 |
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).