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Flight Reliability

DL 4038 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 4038 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

93%
Arrive within 15 minutes
4 min early
Average arrival delay
0.4%
Cancelled
11 min early
Median arrival delay

Based on 542 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon90%(82 flights)
  • Tue85%(80 flights)
  • Wed98%(80 flights)
  • Thu94%(82 flights)
  • Fri94%(82 flights)
  • Sat100%(48 flights)
  • Sun94%(86 flights)
On-time by departure window
  • 6–9 AM88%(101 flights)
  • 9 AM–12 PM94%(439 flights)
On-time trend by month
95%
May

Jun 96% → May 95% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202596%50
July 202572%46
August 202585%40
September 2025100%34
October 202596%46
December 202596%24
January 202697%62
February 202689%56
March 202697%60
April 2026100%60
May 202695%62
Departures on time
93%
Diverted
0%
Flights flown
540
Months covered
11

Keep nerding

Based on 542 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.