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Flight Reliability

DL 3998 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 3998 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

71%
Arrive within 15 minutes
34 min
Average arrival delay
4.9%
Cancelled
4 min early
Median arrival delay

Based on 309 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon74%(43 flights)
  • Tue69%(45 flights)
  • Wed70%(47 flights)
  • Thu69%(42 flights)
  • Fri70%(43 flights)
  • Sat77%(31 flights)
  • Sun67%(42 flights)
On-time by departure window
  • 6–9 AM77%(26 flights)
  • 9 AM–12 PM78%(27 flights)
  • 12–3 PM78%(46 flights)
  • 3–6 PM87%(37 flights)
  • 6–9 PM62%(156 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
93%
Apr

Jun 48% → Apr 93% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202548%27
July 202565%23
August 202577%31
September 202579%29
October 202559%29
November 202564%28
December 202544%18
January 202682%22
March 202671%42
April 202693%29
Departures on time
72%
Diverted
0.3%
Flights flown
293
Months covered
12

Keep nerding

Based on 309 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.