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Flight Reliability

UA 4989 · United Airlines

MOB → Houston (MOB–IAH)

86
Pretty Reliable
WanderNerd Reliability Score
83%
Arrive within 15 minutes
4 min
Average arrival delay
1.4%
Cancelled
13 min early
Median arrival delay

Based on 138 historical flights. Data through May 2026.

What the data says

The 9 AM–12 PM departure wins.

UA 4989 departing between 9 AM–12 PM arrived on time 88% of the time, versus 73% between 6–9 AM.

Sunday scaries are real for this one.

UA 4989 arrived on time 88% of the time on Tuesdays. On Sundays: 80%.

A bit ahead of the United Airlines network.

UA 4989 arrived on time 83% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon85%(20 flights)
  • Tue88%(17 flights)
  • Wed86%(21 flights)
  • Thu81%(21 flights)
  • Fri81%(21 flights)
  • Sat81%(21 flights)
  • Sun80%(15 flights)
On-time by departure window
  • 6–9 AM73%(44 flights)
  • 9 AM–12 PM88%(92 flights)
On-time trend by month
68%
May

Jan 88% → May 68% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
January 202688%24
February 202689%26
March 202683%29
April 202692%26
May 202668%31
Departures on time
85%
Diverted
0%
Flights flown
136
Months covered
5

Same route, other flights

Keep nerding

Based on 138 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.