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Route Reliability

Washington → Greenville

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

73
Usually Fine
WanderNerd Reliability Score
77%
Arrive within 15 minutes
17 min
Average arrival delay
1.9%
Cancelled
908
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 77% of the time across 908 flights. No comparison to make.

What the data says

The 12–3 PM departure wins.

IAD–GSP flights departing between 12–3 PM arrived on time 80% of the time, versus 61% between 9 PM–12 AM.

Sunday scaries are real for this one.

IAD–GSP flights arrived on time 82% of the time on Wednesdays. On Sundays: 71%.

Trending in the right direction.

IAD–GSP flights arrived on time 83% of the time over the last three months in the data, compared with 75% in the three months before that.

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
  • Mon72%(141 flights)
  • Tue81%(125 flights)
  • Wed82%(126 flights)
  • Thu77%(137 flights)
  • Fri75%(138 flights)
  • Sat80%(102 flights)
  • Sun71%(119 flights)
On-time by departure window
  • 6–9 AM78%(148 flights)
  • 12–3 PM80%(332 flights)
  • 3–6 PM75%(346 flights)
  • 9 PM–12 AM61%(62 flights)
On-time trend by month
83%
May

Jun 63% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202563%113
July 202560%101
August 202585%91
September 202587%70
October 202577%62
November 202581%53
December 202566%55
January 202678%50
February 202683%52
March 202673%64
April 202693%88
May 202683%89

Same trip, other airports

Keep nerding

Based on 908 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.