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(DL) Delta Air Lines 639 On-Time Performance Rating

Date Range:

15-Dec-2025 to 15-Feb-2026

(LAX) Los Angeles International Airport

Los Angeles, CA, US

(BOS) Boston Logan International Airport

Boston, MA, US

On-Time Performance Chart

(using rounded numbers)
On-Time
48
79%
Late
6
10%
Very Late
0
0%
Excessive
3
5%
Cancelled
4
7%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
61
Total Delays ( > 1 min )
17
Codeshares
0
Average Delay (min.)
39.411764705882355
Standard Deviation
75
Min
0
Max
262

DL 639 On-Time Performance Details

Overall Rating
2.9 of 5
Average
Percentage On-Time 79%
Average Delay Time 39.411764705882355 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 57% of all other flights in the FlightStats database.
On-Time Performance Rating
4.1 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 82% of other flights.
Delay Performance
1.7 of 5
Average
Average Delay Time 39.411764705882355 min
This flight has an average delay of 39.411764705882355 minutes with a standard deviation of 75 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 34% of other flights.