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Flight Reliability

DL 455 · Delta Air Lines

Washington → Atlanta (DCA–ATL)95% of its flights flew this route. The rest (JFK–DTW) are included in these numbers.

79
Usually Fine
WanderNerd Reliability Score
83%
Arrive within 15 minutes
10 min
Average arrival delay
3.0%
Cancelled
10 min early
Median arrival delay

Based on 363 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

DL 455 departing between 6–9 AM arrived on time 85% of the time, versus 44% between 6–9 PM.

Friday is doing you no favors.

DL 455 arrived on time 90% of the time on Saturdays. On Fridays: 76%.

A bit ahead of the DCA–ATL route.

DL 455 arrived on time 83% of the time, versus 78% across the DCA–ATL route.

Keep a backup plan handy.

DL 455 was cancelled 3.0% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon78%(50 flights)
  • Tue88%(50 flights)
  • Wed87%(52 flights)
  • Thu78%(50 flights)
  • Fri76%(50 flights)
  • Sat90%(50 flights)
  • Sun82%(50 flights)
On-time by departure window
  • 6–9 AM85%(193 flights)
  • 9 AM–12 PM84%(141 flights)
  • 6–9 PM44%(18 flights)
On-time trend by month
84%
May

Jun 86% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202586%28
July 202571%28
August 202587%31
September 202587%30
October 202594%31
November 202575%28
December 202565%31
January 202693%28
February 202685%26
March 202680%30
April 202687%30
May 202684%31
Departures on time
81%
Diverted
0%
Flights flown
352
Months covered
12

Same route, other flights

Keep nerding

Based on 363 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.