(UA) United Airlines 3991 On-Time Performance Rating

Date Range:

15-Nov-2025 to 15-Jan-2026

(IAH) Houston George Bush Intercontinental Airport

Houston, TX, US

(OKC) Will Rogers World Airport

Oklahoma City, OK, US

On-Time Performance Chart

(using rounded numbers)

On-Time

73%

Late

13%

Very Late

Excessive

13%

Cancelled

Diverted

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed

Total Delays ( > 1 min )

Codeshares

Average Delay (min.)

35.714285714285715

Standard Deviation

40.1

Min

Max

105

UA 3991 On-Time Performance Details

Overall Rating

2.3 of 5

Average

Percentage On-Time 73%

Average Delay Time 35.714285714285715 min

FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 2.3 shows that this flight has on-time performance characteristics better than 45% of all other flights in the FlightStats database.

On-Time Performance Rating

2.3 of 5

Average

Percentage On-Time 73%

This flight has an on-time performance of 73%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 46% of other flights.

Delay Performance

2.3 of 5

Average

Average Delay Time 35.714285714285715 min

This flight has an average delay of 35.714285714285715 minutes with a standard deviation of 40.1 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 46% of other flights.