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Flight Reliability

DL 4989 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 4989 moved between routes during this period. Numbers below combine all of them, so treat them as background, not a verdict. For a cleaner answer, check the route you are actually flying.

Combined across all its routes

78%
Arrive within 15 minutes
10 min
Average arrival delay
1.8%
Cancelled
11 min early
Median arrival delay

Based on 338 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon68%(47 flights)
  • Tue84%(45 flights)
  • Wed84%(50 flights)
  • Thu75%(48 flights)
  • Fri78%(51 flights)
  • Sat80%(44 flights)
  • Sun73%(45 flights)
On-time by departure window
  • 9 AM–12 PM90%(62 flights)
  • 12–3 PM79%(106 flights)
  • 3–6 PM71%(66 flights)
  • 6–9 PM72%(96 flights)
On-time trend by month
91%
May

Jun 57% → May 91% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202557%47
July 202584%51
August 202598%41
September 202593%30
October 202567%30
November 202582%27
December 202550%20
February 202658%12
April 202683%36
May 202691%22
Departures on time
77%
Diverted
0.6%
Flights flown
330
Months covered
12

Keep nerding

Based on 338 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.