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Flight Reliability

DL 1204 · Delta Air Lines

Kansas City → Atlanta (MCI–ATL)

94
Nerd Approved
WanderNerd Reliability Score
94%
Arrive within 15 minutes
8 min early
Average arrival delay
1.6%
Cancelled
11 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

Sunday scaries are real for this one.

DL 1204 arrived on time 98% of the time on Thursdays. On Sundays: 90%.

A bit ahead of the MCI–ATL route.

DL 1204 arrived on time 94% of the time, versus 87% across the MCI–ATL route.

Better than the Delta Air Lines network average.

DL 1204 arrived on time 94% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon90%(52 flights)
  • Tue92%(50 flights)
  • Wed96%(52 flights)
  • Thu98%(52 flights)
  • Fri94%(52 flights)
  • Sat98%(49 flights)
  • Sun90%(50 flights)
On-time by departure window
  • 3–6 AM94%(352 flights)
  • 6–9 AM—(5 flights)
On-time trend by month
97%
May

Jun 93% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%29
July 202597%30
August 202597%31
September 2025100%30
October 202597%31
November 202593%28
December 202590%30
January 202690%30
February 202696%28
March 202686%29
April 202693%30
May 202697%31
Departures on time
97%
Diverted
0.5%
Flights flown
357
Months covered
12

Same route, other flights

Keep nerding

Based on 365 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.