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Flight Reliability

DL 4948 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 4948 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

75%
Arrive within 15 minutes
10 min
Average arrival delay
2.2%
Cancelled
7 min early
Median arrival delay

Based on 273 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon75%(36 flights)
  • Tue74%(39 flights)
  • Wed78%(37 flights)
  • Thu72%(32 flights)
  • Fri65%(37 flights)
  • Sat85%(46 flights)
  • Sun73%(40 flights)
On-time by departure window
  • 3–6 AM—(1 flights)
  • 6–9 AM84%(45 flights)
  • 12–3 PM—(1 flights)
  • 3–6 PM69%(32 flights)
  • 6–9 PM73%(69 flights)
  • 9 PM–12 AM74%(119 flights)
On-time trend by month
96%
May

Jul 40% → May 96% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
July 202540%25
August 202577%31
September 202593%15
October 202593%28
November 202575%28
December 202559%17
January 202669%32
March 202672%25
April 202672%29
May 202696%26
Departures on time
75%
Diverted
0%
Flights flown
267
Months covered
12

Keep nerding

Based on 273 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.