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Flight Reliability

DL 1211 · Delta Air Lines

Miami → Atlanta (MIA–ATL)

92
Nerd Approved
WanderNerd Reliability Score
92%
Arrive within 15 minutes
0 min
Average arrival delay
1.7%
Cancelled
8 min early
Median arrival delay

Based on 351 historical flights. Data through May 2026.

What the data says

Monday is the weak spot.

DL 1211 arrived on time 96% of the time on Wednesdays. On Mondays: 86%.

Well ahead of the MIA–ATL route.

DL 1211 arrived on time 92% of the time, versus 73% across the MIA–ATL route.

Better than the Delta Air Lines network average.

DL 1211 arrived on time 92% of the time, versus 81% across the Delta Air Lines network.

Ticking up lately.

DL 1211 arrived on time 93% of the time over the last three months in the data, compared with 90% in the three months before that.

The breakdown

On-time by weekday
  • Mon86%(49 flights)
  • Tue88%(50 flights)
  • Wed96%(50 flights)
  • Thu96%(50 flights)
  • Fri96%(50 flights)
  • Sat96%(45 flights)
  • Sun90%(50 flights)
On-time by departure window
  • 6–9 AM92%(340 flights)
  • 9 AM–12 PM—(4 flights)
On-time trend by month
97%
May

Jun 96% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202596%27
July 202596%26
August 202590%31
September 202593%30
October 202596%27
November 202589%26
December 202586%28
January 202690%30
February 202693%28
March 202693%30
April 202690%30
May 202697%31
Departures on time
95%
Diverted
0.3%
Flights flown
344
Months covered
12

Same route, other flights

Keep nerding

Based on 351 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.