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Route Reliability

Greenville → Washington

GSP–IAD · 384 miles · Greenville–Spartanburg International Airport to Washington Dulles International Airport

83
Pretty Reliable
WanderNerd Reliability Score
83%
Arrive within 15 minutes
10 min
Average arrival delay
1.9%
Cancelled
909
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 83% of the time across 909 flights. No comparison to make.

What the data says

Morning-you made the right choice.

GSP–IAD flights departing between 6–9 AM arrived on time 92% of the time, versus 78% between 12–3 PM.

Sunday scaries are real for this one.

GSP–IAD flights arrived on time 88% of the time on Wednesdays. On Sundays: 79%.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon80%(140 flights)
  • Tue87%(126 flights)
  • Wed88%(123 flights)
  • Thu87%(136 flights)
  • Fri81%(139 flights)
  • Sat84%(103 flights)
  • Sun79%(122 flights)
On-time by departure window
  • 6–9 AM92%(103 flights)
  • 9 AM–12 PM88%(342 flights)
  • 12–3 PM78%(330 flights)
  • 6–9 PM78%(114 flights)
On-time trend by month
83%
May

Jun 76% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202576%112
July 202570%100
August 202585%92
September 202587%70
October 202589%62
November 202585%53
December 202579%56
January 202692%51
February 202692%51
March 202685%65
April 202691%90
May 202683%87

Same trip, other airports

Keep nerding

Based on 909 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.