(UA) United Airlines 1503 On-Time Performance Rating

Date Range:

15-Feb-2026 to 15-Apr-2026

(SFO) San Francisco International Airport

San Francisco, CA, US

(ONT) Ontario International Airport

Ontario, CA, US

On-Time Performance Chart

(using rounded numbers)

On-Time

92%

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.)

54.666666666666664

Standard Deviation

110.5

Min

Max

280

UA 1503 On-Time Performance Details

Overall Rating

2.9 of 5

Average

Percentage On-Time 92%

Average Delay Time 54.666666666666664 min

FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 2.9 shows that this flight has on-time performance characteristics better than 56% of all other flights in the FlightStats database.

On-Time Performance Rating

4.8 of 5

Very Good

Percentage On-Time 92%

This flight has an on-time performance of 92%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 96% of other flights.

Delay Performance

0.9 of 5

Poor

Average Delay Time 54.666666666666664 min

This flight has an average delay of 54.666666666666664 minutes with a standard deviation of 110.5 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 18% of other flights.