(UA) United Airlines 4639 On-Time Performance Rating

Date Range:

15-Feb-2025 to 15-Apr-2025

(ONT) Ontario International Airport

Ontario, CA, US

(SFO) San Francisco International Airport

San Francisco, CA, US

On-Time Performance Chart

(using rounded numbers)

On-Time

61%

Late

Very Late

11%

Excessive

21%

Cancelled

Diverted

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed

Total Delays ( > 1 min )

Codeshares

Average Delay (min.)

65.33333333333333

Standard Deviation

37.6

Min

Max

135

UA 4639 On-Time Performance Details

Overall Rating

0.1 of 5

Very Poor

Percentage On-Time 63%

Average Delay Time 65.33333333333333 min

FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 0.1 shows that this flight has on-time performance characteristics better than 1% of all other flights in the FlightStats database.

On-Time Performance Rating

0.1 of 5

Very Poor

Percentage On-Time 63%

This flight has an on-time performance of 63%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 2% of other flights.

Delay Performance

0.1 of 5

Very Poor

Average Delay Time 65.33333333333333 min

This flight has an average delay of 65.33333333333333 minutes with a standard deviation of 37.6 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 2% of other flights.