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Flight Reliability

UA 4323 · United Airlines

Houston → MOB (IAH–MOB)94% of its flights flew this route. The rest (IAH–MFE, IAH–ICT) are included in these numbers.

76
Usually Fine
WanderNerd Reliability Score
80%
Arrive within 15 minutes
14 min
Average arrival delay
1.4%
Cancelled
10 min early
Median arrival delay

Based on 354 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

UA 4323 departing between 9 AM–12 PM arrived on time 100% of the time, versus 79% between 3–6 PM.

Skip Monday if you can.

UA 4323 arrived on time 86% of the time on Thursdays. On Mondays: 74%.

Slipping a little lately.

UA 4323 arrived on time 84% of the time over the last three months in the data, compared with 88% in the three months before that.

The breakdown

On-time by weekday
  • Mon74%(50 flights)
  • Tue81%(52 flights)
  • Wed84%(51 flights)
  • Thu86%(51 flights)
  • Fri80%(49 flights)
  • Sat81%(41 flights)
  • Sun75%(51 flights)
On-time by departure window
  • 9 AM–12 PM100%(18 flights)
  • 3–6 PM79%(325 flights)
  • 6–9 PM—(2 flights)
On-time trend by month
79%
May

Jun 46% → May 79% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202546%26
July 202557%30
August 202571%28
September 202596%27
October 202594%31
November 202580%30
December 202587%30
January 202690%31
February 202686%28
March 202683%29
April 202689%26
May 202679%29
Departures on time
80%
Diverted
1.1%
Flights flown
345
Months covered
12

Same route, other flights

Keep nerding

Based on 354 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.