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Flight Reliability

DL 1066 · Delta Air Lines

San Antonio → Atlanta (SAT–ATL)

94
Nerd Approved
WanderNerd Reliability Score
94%
Arrive within 15 minutes
4 min early
Average arrival delay
1.7%
Cancelled
11 min early
Median arrival delay

Based on 363 historical flights. Data through May 2026.

What the data says

Saturday is the weak spot.

DL 1066 arrived on time 100% of the time on Wednesdays. On Saturdays: 85%.

Better than the SAT–ATL route average.

DL 1066 arrived on time 94% of the time, versus 86% across the SAT–ATL route.

Better than the Delta Air Lines network average.

DL 1066 arrived on time 94% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon92%(52 flights)
  • Tue96%(52 flights)
  • Wed100%(52 flights)
  • Thu98%(52 flights)
  • Fri92%(51 flights)
  • Sat85%(48 flights)
  • Sun96%(49 flights)
On-time trend by month
87%
May

Jun 97% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202597%29
July 202593%28
August 202597%29
September 2025100%30
October 202597%31
November 202593%30
December 202590%29
January 202690%30
February 202696%28
March 202697%31
April 202697%30
May 202687%31
Departures on time
93%
Diverted
0.3%
Flights flown
356
Months covered
12

Same route, other flights

Keep nerding

Based on 363 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.