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Flight Reliability

DL 1666 · Delta Air Lines

Memphis → Atlanta (MEM–ATL)

87
Pretty Reliable
WanderNerd Reliability Score
91%
Arrive within 15 minutes
5 min early
Average arrival delay
2.8%
Cancelled
16 min early
Median arrival delay

Based on 363 historical flights. Data through May 2026.

What the data says

Wednesday is the weak spot.

DL 1666 arrived on time 98% of the time on Sundays. On Wednesdays: 84%.

A bit ahead of the MEM–ATL route.

DL 1666 arrived on time 91% of the time, versus 87% across the MEM–ATL route.

Better than the Delta Air Lines network average.

DL 1666 arrived on time 91% of the time, versus 81% across the Delta Air Lines network.

Recent months have been rougher.

DL 1666 arrived on time 82% of the time over the last three months in the data, compared with 94% in the three months before that.

The breakdown

On-time by weekday
  • Mon85%(52 flights)
  • Tue94%(50 flights)
  • Wed84%(51 flights)
  • Thu90%(52 flights)
  • Fri92%(51 flights)
  • Sat94%(46 flights)
  • Sun98%(50 flights)
On-time by departure window
  • 3–6 AM92%(115 flights)
  • 6–9 AM90%(237 flights)
On-time trend by month
81%
May

Jun 89% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202589%28
July 202590%29
August 202593%30
September 202597%30
October 202597%31
November 202597%29
December 2025100%31
January 202690%29
February 202693%27
March 202683%29
April 202682%28
May 202681%31
Departures on time
93%
Diverted
0.3%
Flights flown
352
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.