(UA) United Airlines 1221 On-Time Performance Rating

Date Range:

15-Dec-2025 to 15-Feb-2026

(SFO) San Francisco International Airport

San Francisco, CA, US

(RDU) Raleigh-Durham International Airport

Raleigh/Durham, NC, US

On-Time Performance Chart

(using rounded numbers)

On-Time

60%

Late

40%

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.)

Standard Deviation

5.7

Min

Max

UA 1221 On-Time Performance Details

Overall Rating

2.1 of 5

Average

Percentage On-Time 60%

Average Delay Time 25 min

FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 2.1 shows that this flight has on-time performance characteristics better than 41% of all other flights in the FlightStats database.

On-Time Performance Rating

1.1 of 5

Poor

Percentage On-Time 60%

This flight has an on-time performance of 60%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 21% of other flights.

Delay Performance

3.1 of 5

Average

Average Delay Time 25 min

This flight has an average delay of 25 minutes with a standard deviation of 5.7 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 62% of other flights.