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Flight Reliability

DL 939 · Delta Air Lines

Los Angeles → New York (LAX–JFK)

74
Usually Fine
WanderNerd Reliability Score
72%
Arrive within 15 minutes
11 min
Average arrival delay
1.3%
Cancelled
8 min early
Median arrival delay

Based on 320 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

DL 939 departing between 12–3 PM arrived on time 75% of the time, versus 65% between 9 AM–12 PM.

Sunday scaries are real for this one.

DL 939 arrived on time 80% of the time on Fridays and just 62% on Sundays. That gap is worth planning around.

A bit behind the LAX–JFK route.

DL 939 arrived on time 72% of the time, versus 79% across the LAX–JFK route.

Lagging the Delta Air Lines network.

DL 939 arrived on time 72% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon65%(49 flights)
  • Tue79%(52 flights)
  • Wed75%(52 flights)
  • Thu73%(51 flights)
  • Fri80%(49 flights)
  • Sat73%(15 flights)
  • Sun62%(47 flights)
On-time by departure window
  • 9 AM–12 PM65%(88 flights)
  • 12–3 PM75%(227 flights)
On-time trend by month
70%
May

Jun 58% → May 70% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202558%26
July 202563%27
August 202573%26
September 202592%26
October 202589%27
November 202576%25
December 202568%25
January 202660%30
February 202683%24
March 202661%28
April 202679%28
May 202670%23
Departures on time
69%
Diverted
0.3%
Flights flown
315
Months covered
12

Same route, other flights

Keep nerding

Based on 320 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.