(UA) United Airlines 4399 On-Time Performance Rating

Date Range:

15-Feb-2026 to 15-Apr-2026

(FSD) Sioux Falls Regional Airport

Sioux Falls, SD, US

(ORD) Chicago O'Hare International Airport

Chicago, IL, US

On-Time Performance Chart

(using rounded numbers)

On-Time

69%

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.)

43.285714285714285

Standard Deviation

67.2

Min

Max

191

UA 4399 On-Time Performance Details

Overall Rating

1.6 of 5

Average

Percentage On-Time 73%

Average Delay Time 43.285714285714285 min

FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 1.6 shows that this flight has on-time performance characteristics better than 31% of all other flights in the FlightStats database.

On-Time Performance Rating

1.7 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 34% of other flights.

Delay Performance

1.5 of 5

Poor

Average Delay Time 43.285714285714285 min

This flight has an average delay of 43.285714285714285 minutes with a standard deviation of 67.2 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 31% of other flights.