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Flight Reliability

DL 1174 · Delta Air Lines

Atlanta → Philadelphia (ATL–PHL)86% of its flights flew this route. The rest (DAL–ATL, ATL–ILM) are included in these numbers.

73
Usually Fine
WanderNerd Reliability Score
72%
Arrive within 15 minutes
14 min
Average arrival delay
1.2%
Cancelled
0 min
Median arrival delay

Based on 322 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

DL 1174 departing between 9 AM–12 PM arrived on time 97% of the time, versus 68% between 6–9 PM.

Thursdays have been rough.

DL 1174 arrived on time 86% of the time on Saturdays and just 61% on Thursdays. That gap is worth planning around.

Lagging the Delta Air Lines network.

DL 1174 arrived on time 72% of the time, versus 81% across the Delta Air Lines network.

Recent months have been rougher.

DL 1174 arrived on time 73% of the time over the last three months in the data, compared with 86% in the three months before that.

The breakdown

On-time by weekday
  • Mon73%(48 flights)
  • Tue75%(44 flights)
  • Wed77%(44 flights)
  • Thu61%(46 flights)
  • Fri70%(47 flights)
  • Sat86%(42 flights)
  • Sun64%(47 flights)
On-time by departure window
  • 9 AM–12 PM97%(29 flights)
  • 12–3 PM—(7 flights)
  • 3–6 PM—(7 flights)
  • 6–9 PM68%(245 flights)
  • 9 PM–12 AM70%(30 flights)
On-time trend by month
68%
May

Jun 40% → May 68% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202540%30
July 202543%30
August 202555%31
September 202583%30
October 202594%31
November 202586%28
December 202566%29
January 202693%28
February 2026100%17
March 202663%16
April 202687%23
May 202668%25
Departures on time
75%
Diverted
0%
Flights flown
318
Months covered
12

Same route, other flights

Keep nerding

Based on 322 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.