(UA) United Airlines 3999 On-Time Performance Rating

Date Range:

15-Jan-2026 to 15-Mar-2026

(EYW) Key West International Airport

Key West, FL, US

(IAH) Houston George Bush Intercontinental Airport

Houston, TX, US

On-Time Performance Chart

(using rounded numbers)

On-Time

78%

Late

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.)

135.5

Standard Deviation

123.3

Min

Max

306

UA 3999 On-Time Performance Details

Overall Rating

1.5 of 5

Poor

Percentage On-Time 78%

Average Delay Time 135.5 min

FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 1.5 shows that this flight has on-time performance characteristics better than 28% of all other flights in the FlightStats database.

On-Time Performance Rating

2.9 of 5

Average

Percentage On-Time 78%

This flight has an on-time performance of 78%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 58% of other flights.

Delay Performance

0.0 of 5

Very Poor

Average Delay Time 135.5 min

This flight has an average delay of 135.5 minutes with a standard deviation of 123.3 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 0% of other flights.