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Flight Reliability

DL 4055 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 4055 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
0.3%
Cancelled
6 min early
Median arrival delay

Based on 324 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon84%(45 flights)
  • Tue73%(45 flights)
  • Wed62%(45 flights)
  • Thu75%(44 flights)
  • Fri71%(45 flights)
  • Sat76%(49 flights)
  • Sun84%(49 flights)
On-time by departure window
  • 6–9 AM78%(152 flights)
  • 9 AM–12 PM72%(155 flights)
  • 12–3 PM—(5 flights)
  • 3–6 PM80%(10 flights)
On-time trend by month
87%
May

Jun 68% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202568%19
January 202669%54
February 202666%56
March 202667%61
April 202688%59
May 202687%62
Departures on time
75%
Diverted
0.3%
Flights flown
322
Months covered
8

Keep nerding

Based on 324 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.