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(UA) United Airlines 1129 On-Time Performance Rating

Date Range:

01-Jan-2026 to 28-Feb-2026

(IAD) Washington Dulles International Airport

Dulles, VA, US

(SFO) San Francisco International Airport

San Francisco, CA, US

On-Time Performance Chart

(using rounded numbers)
On-Time
33
77%
Late
0
0%
Very Late
2
5%
Excessive
6
14%
Cancelled
1
2%
Diverted
1
2%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
42
Total Delays ( > 1 min )
19
Codeshares
0
Average Delay (min.)
42.421052631578945
Standard Deviation
56.5
Min
0
Max
218

UA 1129 On-Time Performance Details

Overall Rating
2.4 of 5
Average
Percentage On-Time 79%
Average Delay Time 42.421052631578945 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 2.4 shows that this flight has on-time performance characteristics better than 47% of all other flights in the FlightStats database.
On-Time Performance Rating
3.6 of 5
Good
Percentage On-Time 79%
This flight has an on-time performance of 79%. 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
1.2 of 5
Poor
Average Delay Time 42.421052631578945 min
This flight has an average delay of 42.421052631578945 minutes with a standard deviation of 56.5 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 24% of other flights.

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