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Flight Reliability

DL 5135 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 5135 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

85%
Arrive within 15 minutes
1 min early
Average arrival delay
3.6%
Cancelled
10 min early
Median arrival delay

Based on 334 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon91%(43 flights)
  • Tue84%(44 flights)
  • Wed80%(46 flights)
  • Thu93%(44 flights)
  • Fri83%(46 flights)
  • Sat89%(53 flights)
  • Sun72%(46 flights)
On-time by departure window
  • 6–9 AM86%(95 flights)
  • 9 AM–12 PM84%(91 flights)
  • 12–3 PM84%(115 flights)
  • 3–6 PM—(2 flights)
  • 6–9 PM—(5 flights)
  • 9 PM–12 AM100%(14 flights)
On-time trend by month
83%
May

Jun 72% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202572%50
July 202592%62
August 202578%41
September 2025100%13
December 2025100%13
January 202682%27
February 202688%25
March 202687%30
April 202683%12
May 202683%48
Departures on time
82%
Diverted
0%
Flights flown
322
Months covered
11

Keep nerding

Based on 334 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.