(UA) United Airlines 4638 On-Time Performance Rating

Date Range:

15-Jan-2026 to 15-Mar-2026

(SFO) San Francisco International Airport

San Francisco, CA, US

(FAT) Fresno Yosemite International Airport

Fresno, CA, US

On-Time Performance Chart

(using rounded numbers)

On-Time

83%

Late

Very Late

Excessive

Cancelled

Diverted

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed

Total Delays ( > 1 min )

Codeshares

Average Delay (min.)

493.5

Standard Deviation

673.9

Min

Max

970

UA 4638 On-Time Performance Details

Overall Rating

1.8 of 5

Average

Percentage On-Time 83%

Average Delay Time 493.5 min

FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 1.8 shows that this flight has on-time performance characteristics better than 35% of all other flights in the FlightStats database.

On-Time Performance Rating

3.6 of 5

Good

Percentage On-Time 83%

This flight has an on-time performance of 83%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 73% of other flights.

Delay Performance

0.0 of 5

Very Poor

Average Delay Time 493.5 min

This flight has an average delay of 493.5 minutes with a standard deviation of 673.9 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 0% of other flights.