(UA) United Airlines 4399 On-Time Performance Rating

Date Range:

15-Feb-2026 to 15-Apr-2026

(ORD) Chicago O'Hare International Airport

Chicago, IL, US

(MEM) Memphis International Airport

Memphis, TN, US

On-Time Performance Chart

(using rounded numbers)

On-Time

56%

Late

Very Late

Excessive

16%

Cancelled

12%

Diverted

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed

Total Delays ( > 1 min )

Codeshares

Average Delay (min.)

48.55555555555556

Standard Deviation

37.9

Min

Max

123

UA 4399 On-Time Performance Details

Overall Rating

0.6 of 5

Poor

Percentage On-Time 58%

Average Delay Time 48.55555555555556 min

FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 0.6 shows that this flight has on-time performance characteristics better than 11% of all other flights in the FlightStats database.

On-Time Performance Rating

0.1 of 5

Very Poor

Percentage On-Time 58%

This flight has an on-time performance of 58%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 1% of other flights.

Delay Performance

1.1 of 5

Poor

Average Delay Time 48.55555555555556 min

This flight has an average delay of 48.55555555555556 minutes with a standard deviation of 37.9 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 21% of other flights.