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Flight Reliability

DL 839 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 839 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

81%
Arrive within 15 minutes
5 min
Average arrival delay
3.0%
Cancelled
2 min early
Median arrival delay

Based on 710 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon87%(99 flights)
  • Tue91%(104 flights)
  • Wed70%(103 flights)
  • Thu83%(103 flights)
  • Fri80%(104 flights)
  • Sat68%(76 flights)
  • Sun83%(98 flights)
On-time by departure window
  • 6–9 AM79%(342 flights)
  • 9 AM–12 PM83%(345 flights)
On-time trend by month
67%
May

Jun 72% → May 67% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202572%60
July 202588%58
August 202581%62
September 202568%59
October 202573%62
November 202577%56
December 202590%61
January 202688%56
February 202694%48
March 202692%52
April 202684%56
May 202667%57
Departures on time
86%
Diverted
0.3%
Flights flown
687
Months covered
12

Keep nerding

Based on 710 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.