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Flight Reliability

DL 1247 · Delta Air Lines

Chicago → Atlanta (ORD–ATL)

93
Nerd Approved
WanderNerd Reliability Score
88%
Arrive within 15 minutes
2 min
Average arrival delay
0.8%
Cancelled
12 min early
Median arrival delay

Based on 359 historical flights. Data through May 2026.

What the data says

Skip Wednesday if you can.

DL 1247 arrived on time 96% of the time on Tuesdays. On Wednesdays: 82%.

Better than the ORD–ATL route average.

DL 1247 arrived on time 88% of the time, versus 75% across the ORD–ATL route.

A bit ahead of the Delta Air Lines network.

DL 1247 arrived on time 88% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon86%(50 flights)
  • Tue96%(51 flights)
  • Wed82%(51 flights)
  • Thu96%(51 flights)
  • Fri84%(50 flights)
  • Sat84%(51 flights)
  • Sun89%(52 flights)
On-time trend by month
90%
May

Jun 100% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 2025100%27
July 202585%27
August 202587%30
September 202597%30
October 202594%31
November 202590%30
December 202577%31
January 202681%31
February 202696%28
March 202677%30
April 202687%30
May 202690%31
Departures on time
90%
Diverted
0%
Flights flown
356
Months covered
12

Same route, other flights

Keep nerding

Based on 359 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.