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Flight Reliability

DL 5639 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 5639 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

76%
Arrive within 15 minutes
9 min
Average arrival delay
8.5%
Cancelled
9 min early
Median arrival delay

Based on 565 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon81%(79 flights)
  • Tue70%(82 flights)
  • Wed71%(77 flights)
  • Thu74%(74 flights)
  • Fri78%(83 flights)
  • Sat90%(39 flights)
  • Sun72%(79 flights)
On-time by departure window
  • 9 AM–12 PM83%(52 flights)
  • 12–3 PM81%(279 flights)
  • 3–6 PM66%(158 flights)
  • 6–9 PM63%(24 flights)
On-time trend by month
84%
May

Jun 63% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202563%43
July 202553%51
August 202584%57
September 202586%55
October 202577%51
November 202562%39
December 202566%41
January 202690%41
February 202686%49
March 202669%29
April 202692%26
May 202684%31
Departures on time
77%
Diverted
0.7%
Flights flown
513
Months covered
12

Keep nerding

Based on 565 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.