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Flight Reliability

DL 4148 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 4148 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
0.6%
Cancelled
9 min early
Median arrival delay

Based on 308 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon84%(45 flights)
  • Tue89%(46 flights)
  • Wed91%(46 flights)
  • Thu89%(44 flights)
  • Fri77%(44 flights)
  • Sat71%(35 flights)
  • Sun87%(45 flights)
On-time by departure window
  • 6–9 AM—(4 flights)
  • 9 AM–12 PM—(4 flights)
  • 3–6 PM78%(64 flights)
  • 6–9 PM87%(233 flights)
On-time trend by month
97%
May

Oct 85% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
October 202585%48
November 202579%48
December 202573%45
January 202697%31
February 202682%28
March 202681%31
April 202697%30
May 202697%31
Departures on time
86%
Diverted
0.3%
Flights flown
305
Months covered
10

Keep nerding

Based on 308 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.