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Flight Reliability

DL 1206 · Delta Air Lines

Atlanta → Milwaukee (ATL–MKE)96% of its flights flew this route. The rest (MKE–ATL) are included in these numbers.

73
Usually Fine
WanderNerd Reliability Score
73%
Arrive within 15 minutes
9 min
Average arrival delay
1.5%
Cancelled
3 min early
Median arrival delay

Based on 336 historical flights. Data through May 2026.

What the data says

6–9 PM has a slight edge.

Departures between 6–9 PM arrived on time 74% of the time, against 67% between 3–6 PM.

Friday is doing you no favors.

DL 1206 arrived on time 84% of the time on Tuesdays and just 56% on Fridays. That gap is worth planning around.

Lagging the ATL–MKE route.

DL 1206 arrived on time 73% of the time, versus 84% across the ATL–MKE route.

Lagging the Delta Air Lines network.

DL 1206 arrived on time 73% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon74%(50 flights)
  • Tue84%(44 flights)
  • Wed81%(43 flights)
  • Thu72%(50 flights)
  • Fri56%(48 flights)
  • Sat73%(45 flights)
  • Sun74%(49 flights)
On-time by departure window
  • 3–6 PM67%(18 flights)
  • 6–9 PM74%(311 flights)
On-time trend by month
67%
May

Jun 57% → May 67% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202557%28
July 202574%31
August 202565%31
September 202583%30
October 202587%31
November 202579%28
December 202571%31
January 202673%30
February 202682%28
April 202669%16
May 202667%39
Departures on time
77%
Diverted
0.6%
Flights flown
329
Months covered
12

Same route, other flights

Keep nerding

Based on 336 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.