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Flight Reliability

DL 5120 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 5120 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

80%
Arrive within 15 minutes
9 min
Average arrival delay
1.9%
Cancelled
5 min early
Median arrival delay

Based on 586 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon79%(84 flights)
  • Tue85%(84 flights)
  • Wed86%(83 flights)
  • Thu87%(78 flights)
  • Fri74%(82 flights)
  • Sat72%(79 flights)
  • Sun76%(84 flights)
On-time by departure window
  • 6–9 AM84%(337 flights)
  • 9 AM–12 PM74%(236 flights)
  • 6–9 PM—(1 flights)
On-time trend by month
89%
May

Jun 69% → May 89% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%58
July 202572%60
August 202582%62
September 202594%32
October 202577%57
November 202579%56
December 202575%47
January 202689%27
February 202684%25
March 202676%55
April 202688%58
May 202689%37
Departures on time
85%
Diverted
0.2%
Flights flown
574
Months covered
12

Keep nerding

Based on 586 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.