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Flight Reliability

UA 4052 · United Airlines

Houston → Louisville (IAH–SDF)81% of its flights flew this route. The rest (LGA–IAD, IAH–BTR) are included in these numbers.

90
Nerd Approved
WanderNerd Reliability Score
86%
Arrive within 15 minutes
0 min
Average arrival delay
1.1%
Cancelled
10 min early
Median arrival delay

Based on 175 historical flights. Data through May 2026.

What the data says

6–9 PM has a slight edge.

Departures between 6–9 PM arrived on time 87% of the time, against 80% between 9 AM–12 PM.

Saturday is the weak spot.

UA 4052 arrived on time 92% of the time on Tuesdays. On Saturdays: 81%.

A bit ahead of the IAH–SDF route.

UA 4052 arrived on time 86% of the time, versus 81% across the IAH–SDF route.

Better than the United Airlines network average.

UA 4052 arrived on time 86% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon86%(22 flights)
  • Tue92%(26 flights)
  • Wed87%(23 flights)
  • Thu82%(22 flights)
  • Fri88%(32 flights)
  • Sat81%(26 flights)
  • Sun86%(22 flights)
On-time by departure window
  • 9 AM–12 PM80%(20 flights)
  • 6–9 PM87%(153 flights)
On-time trend by month
84%
May

Dec 83% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
December 202583%29
January 202690%30
February 202689%28
March 2026100%10
April 202677%30
May 202684%31
Departures on time
82%
Diverted
0%
Flights flown
173
Months covered
9

Same route, other flights

Keep nerding

Based on 175 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.