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Flight Reliability

DL 1550 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1550 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

82%
Arrive within 15 minutes
4 min
Average arrival delay
1.3%
Cancelled
6 min early
Median arrival delay

Based on 709 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon85%(100 flights)
  • Tue81%(102 flights)
  • Wed89%(102 flights)
  • Thu88%(100 flights)
  • Fri79%(98 flights)
  • Sat77%(98 flights)
  • Sun78%(99 flights)
On-time by departure window
  • 9 AM–12 PM80%(15 flights)
  • 12–3 PM81%(278 flights)
  • 3–6 PM83%(388 flights)
  • 6–9 PM94%(18 flights)
On-time trend by month
82%
May

Jun 65% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202565%60
July 202579%62
August 202587%60
September 202595%60
October 202592%62
November 202587%54
December 202590%48
January 202691%54
February 202673%56
March 202668%62
April 202683%60
May 202682%61
Departures on time
82%
Diverted
0.1%
Flights flown
699
Months covered
12

Keep nerding

Based on 709 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.