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Flight Reliability

DL 4937 · Delta Air Lines

MLI → Atlanta (MLI–ATL)

90
Nerd Approved
WanderNerd Reliability Score
91%
Arrive within 15 minutes
2 min
Average arrival delay
1.6%
Cancelled
11 min early
Median arrival delay

Based on 364 historical flights. Data through May 2026.

What the data says

Sunday scaries are real for this one.

DL 4937 arrived on time 94% of the time on Thursdays. On Sundays: 87%.

Better than the MLI–ATL route average.

DL 4937 arrived on time 91% of the time, versus 83% across the MLI–ATL route.

Better than the Delta Air Lines network average.

DL 4937 arrived on time 91% of the time, versus 81% across the Delta Air Lines network.

Ticking up lately.

DL 4937 arrived on time 92% of the time over the last three months in the data, compared with 86% in the three months before that.

The breakdown

On-time by weekday
  • Mon90%(51 flights)
  • Tue94%(51 flights)
  • Wed90%(52 flights)
  • Thu94%(52 flights)
  • Fri88%(50 flights)
  • Sat92%(48 flights)
  • Sun87%(52 flights)
On-time by departure window
  • 3–6 AM90%(211 flights)
  • 6–9 AM92%(144 flights)
  • 3–6 PM—(1 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 202581%31
August 202597%30
September 2025100%30
October 202590%31
November 202593%28
December 202584%31
January 202690%29
February 202686%28
March 202693%28
April 202687%30
May 202697%31
Departures on time
92%
Diverted
0.5%
Flights flown
356
Months covered
12

Same route, other flights

Keep nerding

Based on 364 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.