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Flight Reliability

UA 6251 · United Airlines

Detroit → Houston (DTW–IAH)92% of its flights flew this route. The rest (IAD–SDF, MCI–IAH) are included in these numbers.

94
Nerd Approved
WanderNerd Reliability Score
87%
Arrive within 15 minutes
9 min early
Average arrival delay
0.3%
Cancelled
21 min early
Median arrival delay

Based on 298 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 9 AM–12 PM arrived on time 87% of the time, against 84% between 3–6 PM.

Friday is doing you no favors.

UA 6251 arrived on time 95% of the time on Saturdays. On Fridays: 81%.

A bit ahead of the DTW–IAH route.

UA 6251 arrived on time 87% of the time, versus 81% across the DTW–IAH route.

Better than the United Airlines network average.

UA 6251 arrived on time 87% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon82%(51 flights)
  • Tue89%(44 flights)
  • Wed87%(46 flights)
  • Thu94%(51 flights)
  • Fri81%(52 flights)
  • Sat95%(20 flights)
  • Sun88%(33 flights)
On-time by departure window
  • 6–9 AM—(5 flights)
  • 9 AM–12 PM87%(273 flights)
  • 3–6 PM84%(19 flights)
On-time trend by month
77%
May

Jun 80% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202580%30
July 202584%31
August 202596%25
September 202581%26
October 2025100%25
November 202594%16
December 202576%21
January 202688%24
February 202690%20
March 202695%19
April 202693%30
May 202677%30
Departures on time
90%
Diverted
0%
Flights flown
297
Months covered
12

Same route, other flights

Keep nerding

Based on 298 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.