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Flight Reliability

DL 4990 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 4990 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

83%
Arrive within 15 minutes
1 min
Average arrival delay
2.8%
Cancelled
10 min early
Median arrival delay

Based on 249 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon78%(37 flights)
  • Tue81%(32 flights)
  • Wed93%(30 flights)
  • Thu82%(33 flights)
  • Fri77%(34 flights)
  • Sat81%(43 flights)
  • Sun88%(33 flights)
On-time by departure window
  • 6–9 AM—(6 flights)
  • 9 AM–12 PM84%(211 flights)
  • 12–3 PM—(7 flights)
  • 3–6 PM61%(18 flights)
On-time trend by month
100%
Apr

Jun 78% → Apr 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202578%27
July 202593%30
August 202594%31
September 202590%30
October 202581%31
November 202571%28
December 202573%26
January 202660%10
April 2026100%12
Departures on time
83%
Diverted
0%
Flights flown
242
Months covered
12

Keep nerding

Based on 249 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.