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Flight Reliability

UA 4958 · United Airlines

Greenville → Washington (GSP–IAD)

91
Nerd Approved
WanderNerd Reliability Score
88%
Arrive within 15 minutes
2 min
Average arrival delay
1.3%
Cancelled
11 min early
Median arrival delay

Based on 313 historical flights. Data through May 2026.

What the data says

Skip Monday if you can.

UA 4958 arrived on time 94% of the time on Tuesdays. On Mondays: 83%.

A bit ahead of the GSP–IAD route.

UA 4958 arrived on time 88% of the time, versus 83% across the GSP–IAD route.

Better than the United Airlines network average.

UA 4958 arrived on time 88% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon83%(46 flights)
  • Tue94%(46 flights)
  • Wed92%(47 flights)
  • Thu90%(48 flights)
  • Fri87%(47 flights)
  • Sat85%(34 flights)
  • Sun85%(41 flights)
On-time trend by month
90%
May

Jun 66% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202566%29
July 202559%27
August 202591%23
September 2025100%23
October 2025100%31
November 202593%30
December 202587%31
January 202693%28
February 202696%27
March 202693%29
May 202690%30
Departures on time
89%
Diverted
0%
Flights flown
309
Months covered
12

Same route, other flights

Keep nerding

Based on 313 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.