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Flight Reliability

DL 1504 · Delta Air Lines

Pittsburgh → Atlanta (PIT–ATL)

90
Nerd Approved
WanderNerd Reliability Score
92%
Arrive within 15 minutes
7 min early
Average arrival delay
2.2%
Cancelled
12 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 3–6 AM arrived on time 97% of the time, against 91% between 6–9 AM.

Skip Monday if you can.

DL 1504 arrived on time 96% of the time on Sundays. On Mondays: 84%.

Better than the Delta Air Lines network average.

DL 1504 arrived on time 92% of the time, versus 81% across the Delta Air Lines network.

Trending in the right direction.

DL 1504 arrived on time 95% of the time over the last three months in the data, compared with 85% in the three months before that.

The breakdown

On-time by weekday
  • Mon84%(49 flights)
  • Tue94%(52 flights)
  • Wed92%(52 flights)
  • Thu92%(52 flights)
  • Fri94%(51 flights)
  • Sat94%(49 flights)
  • Sun96%(51 flights)
On-time by departure window
  • 3–6 AM97%(92 flights)
  • 6–9 AM91%(264 flights)
On-time trend by month
97%
May

Jun 100% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 2025100%29
July 202594%31
August 202593%29
September 202597%30
October 202594%31
November 202593%29
December 202579%29
January 202679%29
February 202696%28
March 202687%30
April 2026100%30
May 202697%31
Departures on time
94%
Diverted
0.3%
Flights flown
356
Months covered
12

Same route, other flights

Keep nerding

Based on 365 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.