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Flight Reliability

UA 3989 · United Airlines

Indianapolis → Houston (IND–IAH)82% of its flights flew this route. The rest (GRR–IAH, ATL–IAH) are included in these numbers.

91
Nerd Approved
WanderNerd Reliability Score
88%
Arrive within 15 minutes
6 min early
Average arrival delay
0.4%
Cancelled
17 min early
Median arrival delay

Based on 249 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 6–9 AM arrived on time 91% of the time, against 87% between 9 AM–12 PM.

Saturday is the weak spot.

UA 3989 arrived on time 94% of the time on Thursdays. On Saturdays: 83%.

Better than the United Airlines network average.

UA 3989 arrived on time 88% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon83%(35 flights)
  • Tue86%(35 flights)
  • Wed85%(34 flights)
  • Thu94%(36 flights)
  • Fri92%(36 flights)
  • Sat83%(35 flights)
  • Sun91%(35 flights)
On-time by departure window
  • 6–9 AM91%(33 flights)
  • 9 AM–12 PM87%(207 flights)
  • 12–3 PM—(1 flights)
  • 3–6 PM—(5 flights)
On-time trend by month
87%
May

Oct 90% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
October 202590%31
November 202593%30
December 202584%31
January 202683%30
February 202693%27
March 202690%30
April 202680%30
May 202687%31
Departures on time
86%
Diverted
0.8%
Flights flown
246
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.