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Flight Reliability

UA 3987 · United Airlines

Houston → Kansas City (IAH–MCI)85% of its flights flew this route. The rest (IAD–MSP, CMH–IAD) are included in these numbers.

93
Nerd Approved
WanderNerd Reliability Score
86%
Arrive within 15 minutes
1 min early
Average arrival delay
0.4%
Cancelled
10 min early
Median arrival delay

Based on 249 historical flights. Data through May 2026.

What the data says

Mondays have been rough.

UA 3987 arrived on time 94% of the time on Fridays and just 77% on Mondays. That gap is worth planning around.

A bit ahead of the IAH–MCI route.

UA 3987 arrived on time 86% of the time, versus 83% across the IAH–MCI route.

Better than the United Airlines network average.

UA 3987 arrived on time 86% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon77%(35 flights)
  • Tue89%(35 flights)
  • Wed86%(35 flights)
  • Thu83%(36 flights)
  • Fri94%(36 flights)
  • Sat92%(36 flights)
  • Sun83%(35 flights)
On-time by departure window
  • 9 AM–12 PM88%(33 flights)
  • 12–3 PM86%(211 flights)
  • 3–6 PM—(1 flights)
  • 6–9 PM—(3 flights)
On-time trend by month
87%
May

Oct 81% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
October 202581%31
November 202577%30
December 202587%31
January 202687%31
February 202696%28
March 202683%30
April 202693%30
May 202687%31
Departures on time
89%
Diverted
0%
Flights flown
248
Months covered
9

Same route, other flights

Keep nerding

Based on 249 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.