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(UA) United Airlines 635 On-Time Performance Rating

Date Range:

15-May-2026 to 15-Jul-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
31
78%
Late
5
13%
Very Late
1
3%
Excessive
3
8%
Cancelled
0
0%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
40
Total Delays ( > 1 min )
16
Codeshares
0
Average Delay (min.)
23.8125
Standard Deviation
24.1
Min
0
Max
87

UA 635 On-Time Performance Details

Overall Rating
3.6 of 5
Good
Percentage On-Time 78%
Average Delay Time 23.8125 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 3.6 shows that this flight has on-time performance characteristics better than 71% of all other flights in the FlightStats database.
On-Time Performance Rating
3.3 of 5
Average
Percentage On-Time 78%
This flight has an on-time performance of 78%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 66% of other flights.
Delay Performance
3.9 of 5
Good
Average Delay Time 23.8125 min
This flight has an average delay of 23.8125 minutes with a standard deviation of 24.1 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 79% of other flights.

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