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(UA) United Airlines 1581 On-Time Performance Rating

Date Range:

01-Jan-2026 to 28-Feb-2026

(SLC) Salt Lake City International Airport

Salt Lake City, UT, US

(SFO) San Francisco International Airport

San Francisco, CA, US

On-Time Performance Chart

(using rounded numbers)
On-Time
41
75%
Late
5
9%
Very Late
2
4%
Excessive
7
13%
Cancelled
0
0%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
55
Total Delays ( > 1 min )
18
Codeshares
0
Average Delay (min.)
47.333333333333336
Standard Deviation
49.5
Min
0
Max
186

UA 1581 On-Time Performance Details

Overall Rating
1.5 of 5
Poor
Percentage On-Time 75%
Average Delay Time 47.333333333333336 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 1.5 shows that this flight has on-time performance characteristics better than 29% of all other flights in the FlightStats database.
On-Time Performance Rating
2.3 of 5
Average
Percentage On-Time 75%
This flight has an on-time performance of 75%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 46% of other flights.
Delay Performance
0.7 of 5
Poor
Average Delay Time 47.333333333333336 min
This flight has an average delay of 47.333333333333336 minutes with a standard deviation of 49.5 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 14% of other flights.

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