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Flight Reliability

DL 1249 · Delta Air Lines

Miami → Atlanta (MIA–ATL)85% of its flights flew this route. The rest (ATL–MIA, GEG–SLC) are included in these numbers.

88
Pretty Reliable
WanderNerd Reliability Score
91%
Arrive within 15 minutes
3 min early
Average arrival delay
2.5%
Cancelled
11 min early
Median arrival delay

Based on 320 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

DL 1249 departing between 6–9 AM arrived on time 96% of the time, versus 75% between 3–6 PM.

Thursdays have been rough.

DL 1249 arrived on time 98% of the time on Saturdays and just 80% on Thursdays. That gap is worth planning around.

Well ahead of the MIA–ATL route.

DL 1249 arrived on time 91% of the time, versus 73% across the MIA–ATL route.

Better than the Delta Air Lines network average.

DL 1249 arrived on time 91% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon91%(45 flights)
  • Tue91%(44 flights)
  • Wed91%(45 flights)
  • Thu80%(44 flights)
  • Fri92%(47 flights)
  • Sat98%(45 flights)
  • Sun93%(41 flights)
On-time by departure window
  • 3–6 AM96%(100 flights)
  • 6–9 AM96%(128 flights)
  • 12–3 PM76%(38 flights)
  • 3–6 PM75%(44 flights)
  • 6–9 PM—(1 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%28
July 202593%29
August 2025100%13
November 202588%41
December 202565%48
January 202697%31
February 2026100%28
March 202693%29
April 2026100%30
May 202697%31
Departures on time
90%
Diverted
0.3%
Flights flown
311
Months covered
11

Same route, other flights

Keep nerding

Based on 320 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.