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Flight Reliability

DL 2639 · Delta Air Lines

New York → Boston (JFK–BOS)

54
A Little Dicey
WanderNerd Reliability Score
67%
Arrive within 15 minutes
26 min
Average arrival delay
3.2%
Cancelled
5 min early
Median arrival delay

Based on 349 historical flights. Data through May 2026.

What the data says

Thursdays have been rough.

DL 2639 arrived on time 76% of the time on Wednesdays and just 52% on Thursdays. That gap is worth planning around.

A bit behind the JFK–BOS route.

DL 2639 arrived on time 67% of the time, versus 74% across the JFK–BOS route.

Lagging the Delta Air Lines network.

DL 2639 arrived on time 67% of the time, versus 81% across the Delta Air Lines network.

Keep a backup plan handy.

DL 2639 was cancelled 3.2% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon70%(47 flights)
  • Tue73%(48 flights)
  • Wed76%(49 flights)
  • Thu52%(48 flights)
  • Fri70%(50 flights)
  • Sat59%(49 flights)
  • Sun70%(47 flights)
On-time by departure window
  • 3–6 PM—(1 flights)
  • 6–9 PM67%(61 flights)
  • 9 PM–12 AM67%(276 flights)
On-time trend by month
77%
May

Jun 40% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202540%30
July 202543%28
August 202571%31
September 202573%30
October 202567%30
November 202573%30
December 202558%19
January 202679%24
February 202669%26
March 202687%30
April 202667%30
May 202677%30
Departures on time
65%
Diverted
0%
Flights flown
338
Months covered
12

Same route, other flights

Keep nerding

Based on 349 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.