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Flight Reliability

DL 685 · Delta Air Lines

New York → San Diego (JFK–SAN)98% of its flights flew this route. The rest (GPT–ATL) are included in these numbers.

64
A Little Dicey
WanderNerd Reliability Score
77%
Arrive within 15 minutes
0 min
Average arrival delay
3.2%
Cancelled
12 min early
Median arrival delay

Based on 309 historical flights. Data through May 2026.

What the data says

Wednesdays have been rough.

DL 685 arrived on time 88% of the time on Saturdays and just 69% on Wednesdays. That gap is worth planning around.

A bit behind the JFK–SAN route.

DL 685 arrived on time 77% of the time, versus 80% across the JFK–SAN route.

A bit behind the Delta Air Lines network.

DL 685 arrived on time 77% of the time, versus 81% across the Delta Air Lines network.

Keep a backup plan handy.

DL 685 was cancelled 3.2% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon79%(47 flights)
  • Tue79%(42 flights)
  • Wed69%(42 flights)
  • Thu71%(48 flights)
  • Fri84%(49 flights)
  • Sat88%(16 flights)
  • Sun74%(49 flights)
On-time by departure window
  • 9 AM–12 PM—(5 flights)
  • 6–9 PM76%(288 flights)
On-time trend by month
77%
May

Jun 62% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202562%26
July 202558%24
August 202589%28
September 202574%27
October 202585%26
November 202571%24
December 202573%26
January 202680%15
February 202693%14
March 202683%24
April 202679%28
May 202677%31
Departures on time
75%
Diverted
1.9%
Flights flown
293
Months covered
12

Same route, other flights

Keep nerding

Based on 309 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.