GSP to BWI flight delays & on-time performance
Nonstop flights from Greenville-Spartanburg International Airport to Baltimore/Washington International Thurgood Marshall Airport · 426 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at GSP or BWI right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Greer (GSP) to Baltimore (BWI) arrived on time 90% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 1.5% were cancelled, and 4% arrived an hour or more late.
- Southwest Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 10am did best (100% on time); around 8pm did worst (69%).
- Tuesday was the most reliable day to fly (94% on time) and Monday the least (81%).
- The largest source of delay minutes was late-arriving aircraft (57%).
Which airline is most on time from GSP to BWI?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Southwest Airlines | 90% | 1.5% | 7 min | 3.7% | 719 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 7am95%92 flights
- 8am94%217 flights
- 9am100%18 flights
- 10am100%28 flights
- 1pm85%180 flights
- 2pm100%11 flights
- 3pm90%29 flights
- 4pm89%29 flights
- 5pm73%11 flights
- 6pm88%41 flights
- 8pm69%36 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday81%1.9% cancelled
- Tuesday94%0.0% cancelled
- Wednesday91%0.0% cancelled
- Thursday89%0.0% cancelled
- Friday90%0.9% cancelled
- Saturday93%4.2% cancelled
- Sunday92%3.8% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft57%
- Airline (crew, maintenance, cleaning, fueling)32%
- Air traffic control & airport congestion10%
- Extreme weather2%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather91%
- Airline (crew, maintenance, cleaning, fueling)9%
- Air traffic control & airport congestion0%
- Security0%
GSP to BWI: common questions
- How often are GSP to BWI flights on time?
- 90% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Greer to Baltimore cancelled?
- 1.5% of scheduled flights were cancelled (11 of 719).
- How long are typical delays?
- Across all flights the average arrival delay was 7 min (early arrivals count as zero). Flights that were late arrived 60 min behind schedule on average, and 3.7% of flights were an hour or more late.
- How long is taxi time at GSP?
- Flights on this route spent 11 min taxiing from the gate to takeoff on average.
Related routes
Return trip: BWI to GSP — 82% on time
More flights from Greer
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: GSP → BWI, nonstop flights by US airlines that report to the DOT. How we calculate this.