Skip to content
WanderNerd
Check a flight

Flight Reliability

DL 679 · Delta Air Lines

New York → San Francisco (JFK–SFO)

80
Pretty Reliable
WanderNerd Reliability Score
76%
Arrive within 15 minutes
5 min
Average arrival delay
0.8%
Cancelled
8 min early
Median arrival delay

Based on 354 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

DL 679 departing between 3–6 PM arrived on time 81% of the time, versus 69% between 12–3 PM.

Skip Thursday if you can.

DL 679 arrived on time 79% of the time on Fridays. On Thursdays: 69%.

A bit behind the Delta Air Lines network.

DL 679 arrived on time 76% of the time, versus 81% across the Delta Air Lines network.

Trending in the right direction.

DL 679 arrived on time 79% of the time over the last three months in the data, compared with 63% in the three months before that.

The breakdown

On-time by weekday
  • Mon78%(51 flights)
  • Tue77%(51 flights)
  • Wed77%(52 flights)
  • Thu69%(52 flights)
  • Fri79%(52 flights)
  • Sat71%(41 flights)
  • Sun77%(52 flights)
On-time by departure window
  • 12–3 PM69%(154 flights)
  • 3–6 PM81%(197 flights)
On-time trend by month
71%
May

Jun 73% → May 71% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%30
July 202583%30
August 202597%31
September 202578%27
October 202590%30
November 202557%28
December 202545%29
January 202667%30
February 202678%27
March 202686%28
April 202680%30
May 202671%31
Departures on time
80%
Diverted
0%
Flights flown
351
Months covered
12

Same route, other flights

Keep nerding

Based on 354 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.