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Route Reliability

Greenville → Baltimore

GSP–BWI · 426 miles · Greenville–Spartanburg International Airport to Baltimore/Washington International Thurgood Marshall Airport

91
Nerd Approved
WanderNerd Reliability Score
89%
Arrive within 15 minutes
1 min early
Average arrival delay
1.5%
Cancelled
719
Flights in the data

Data through May 2026.

Southwest Airlines is the only airline in this data on this route, arriving on time 89% of the time across 719 flights. No comparison to make.

What the data says

Morning-you made the right choice.

GSP–BWI flights departing between 9 AM–12 PM arrived on time 100% of the time, versus 70% between 3–6 PM.

Skip Monday if you can.

GSP–BWI flights arrived on time 95% of the time on Saturdays. On Mondays: 81%.

Flights on this route

The breakdown

On-time by weekday
  • Mon81%(102 flights)
  • Tue93%(104 flights)
  • Wed90%(103 flights)
  • Thu86%(103 flights)
  • Fri88%(103 flights)
  • Sat95%(92 flights)
  • Sun91%(101 flights)
On-time by departure window
  • 3–6 AM92%(26 flights)
  • 6–9 AM97%(289 flights)
  • 9 AM–12 PM100%(45 flights)
  • 12–3 PM93%(140 flights)
  • 3–6 PM70%(122 flights)
  • 6–9 PM80%(86 flights)
On-time trend by month
90%
May

Jun 77% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202577%60
July 202574%61
August 202590%62
September 202595%60
October 202595%58
November 202589%56
December 202588%59
January 202693%56
February 202694%53
March 202692%61
April 202695%60
May 202690%62

Same trip, other airports

Keep nerding

Based on 719 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.