Skip to content
WanderNerd
Check a flight

Flight Reliability

DL 409 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 409 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
1 min
Average arrival delay
0.7%
Cancelled
7 min early
Median arrival delay

Based on 444 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon88%(64 flights)
  • Tue78%(60 flights)
  • Wed96%(54 flights)
  • Thu89%(63 flights)
  • Fri85%(67 flights)
  • Sat83%(71 flights)
  • Sun86%(62 flights)
On-time by departure window
  • 12–3 AM100%(38 flights)
  • 9 AM–12 PM86%(194 flights)
  • 12–3 PM86%(191 flights)
  • 3–6 PM—(9 flights)
  • 6–9 PM—(9 flights)
On-time trend by month
82%
May

Jun 88% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202588%40
July 202586%35
August 202597%33
September 202597%30
October 202574%31
November 202580%30
December 202569%32
January 202691%22
February 2026100%16
March 202687%52
April 202691%58
May 202682%62
Departures on time
87%
Diverted
0%
Flights flown
441
Months covered
12

Keep nerding

Based on 444 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.