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Flight Reliability

DL 1557 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1557 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

86%
Arrive within 15 minutes
4 min
Average arrival delay
1.6%
Cancelled
10 min early
Median arrival delay

Based on 612 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon85%(92 flights)
  • Tue84%(86 flights)
  • Wed91%(84 flights)
  • Thu90%(90 flights)
  • Fri84%(90 flights)
  • Sat88%(67 flights)
  • Sun81%(90 flights)
On-time by departure window
  • 12–3 AM91%(11 flights)
  • 12–3 PM86%(581 flights)
  • 3–6 PM—(7 flights)
On-time trend by month
94%
May

Jun 82% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202582%56
July 202566%56
August 2025100%62
September 202598%54
October 202597%58
November 202576%58
December 202581%52
January 202686%22
February 202691%22
March 202682%49
April 202681%58
May 202694%52
Departures on time
87%
Diverted
0.5%
Flights flown
599
Months covered
12

Keep nerding

Based on 612 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.