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Flight Reliability

UA 4013 · United Airlines

Charleston → Houston (CHS–IAH)82% of its flights flew this route. The rest (IAH–DTW, BHM–IAH) are included in these numbers.

95
Nerd Approved
WanderNerd Reliability Score
92%
Arrive within 15 minutes
5 min early
Average arrival delay
1.2%
Cancelled
17 min early
Median arrival delay

Based on 242 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 9 AM–12 PM arrived on time 96% of the time, against 91% between 6–9 AM.

Friday is doing you no favors.

UA 4013 arrived on time 100% of the time on Thursdays. On Fridays: 86%.

A bit ahead of the CHS–IAH route.

UA 4013 arrived on time 92% of the time, versus 85% across the CHS–IAH route.

Better than the United Airlines network average.

UA 4013 arrived on time 92% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon89%(35 flights)
  • Tue91%(35 flights)
  • Wed97%(30 flights)
  • Thu100%(34 flights)
  • Fri86%(36 flights)
  • Sat89%(36 flights)
  • Sun91%(33 flights)
On-time by departure window
  • 6–9 AM91%(198 flights)
  • 9 AM–12 PM96%(27 flights)
  • 12–3 PM—(5 flights)
  • 3–6 PM—(9 flights)
On-time trend by month
94%
May

Oct 94% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
October 202594%31
November 202597%30
December 202594%31
January 202692%26
February 202688%25
March 202680%30
April 202693%29
May 202694%31
Departures on time
90%
Diverted
0%
Flights flown
239
Months covered
9

Same route, other flights

Keep nerding

Based on 242 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.