Route
GSP → BWI
Greenville-Spartanburg International Airport Baltimore/Washington International Thurgood Marshall Airport
How punctual is this route?
- On-time arrivals
- 89.7%
- Less than 15 minutes late
- Cancelled
- 1.7%
- Of scheduled flights
- Average delay when late
- 71 min
- Flights arriving 15+ minutes late
- Flights tracked
- 719
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 55%
- Airline (crew, maintenance, cleaning) 28%
- Air traffic control & airport 16%
- Extreme weather 1%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 95.0% | 60 |
| October 2025 | 94.8% | 58 |
| November 2025 | 89.3% | 56 |
| December 2025 | 86.4% | 60 |
| January 2026 | 92.9% | 62 |
| February 2026 | 94.3% | 56 |
| March 2026 | 91.8% | 61 |
| April 2026 | 95.0% | 60 |
| May 2026 | 90.3% | 62 |
| June 2026 | 86.7% | 60 |
| July 2026 | 78.3% | 62 |
| August 2026 | 82.0% | 62 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Southwest Airlines | 719 | 89.7% | 1.7% | 71 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN1899
10% late · 60 flights
-
WN2243
9% late · 58 flights
-
WN1772
6% late · 57 flights
-
WN2244
8% late · 50 flights
-
WN2119
5% late · 47 flights
-
WN3008
0% late · 46 flights
-
WN3029
9% late · 33 flights
-
WN3412
6% late · 33 flights
-
WN4126
41% late · 27 flights
-
WN3574
12% late · 24 flights
-
WN2737
0% late · 23 flights
-
WN398
10% late · 21 flights
-
WN1838
5% late · 20 flights
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