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Flight Reliability

DL 656 · Delta Air Lines

Atlanta → San Francisco (ATL–SFO)87% of its flights flew this route. The rest (PNS–ATL, BOS–LGA) are included in these numbers.

75
Usually Fine
WanderNerd Reliability Score
75%
Arrive within 15 minutes
8 min
Average arrival delay
1.7%
Cancelled
2 min early
Median arrival delay

Based on 288 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

DL 656 departing between 3–6 PM arrived on time 94% of the time, versus 72% between 9 PM–12 AM.

Friday is doing you no favors.

DL 656 arrived on time 87% of the time on Wednesdays and just 65% on Fridays. That gap is worth planning around.

A bit behind the Delta Air Lines network.

DL 656 arrived on time 75% of the time, versus 81% across the Delta Air Lines network.

Recent months have been rougher.

DL 656 arrived on time 65% of the time over the last three months in the data, compared with 76% in the three months before that.

The breakdown

On-time by weekday
  • Mon77%(48 flights)
  • Tue79%(29 flights)
  • Wed87%(31 flights)
  • Thu78%(50 flights)
  • Fri65%(48 flights)
  • Sat76%(29 flights)
  • Sun66%(47 flights)
On-time by departure window
  • 12–3 PM—(4 flights)
  • 3–6 PM94%(32 flights)
  • 6–9 PM—(2 flights)
  • 9 PM–12 AM72%(244 flights)
On-time trend by month
56%
May

Jun 72% → May 56% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202572%18
July 202569%16
August 202578%27
September 202593%29
October 202570%27
November 202571%21
December 202573%30
January 202681%31
February 202675%28
March 202668%19
April 202672%18
May 202656%18
Departures on time
77%
Diverted
0.3%
Flights flown
282
Months covered
12

Same route, other flights

Keep nerding

Based on 288 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.