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Flight Reliability

DL 5721 · Delta Air Lines

Boston → New York (BOS–LGA)98% of its flights flew this route. The rest (IND–BOS, LGA–GSO) are included in these numbers.

40
Bring Snacks
WanderNerd Reliability Score
68%
Arrive within 15 minutes
14 min
Average arrival delay
8.5%
Cancelled
8 min early
Median arrival delay

Based on 331 historical flights. Data through May 2026.

What the data says

Thursdays have been rough.

DL 5721 arrived on time 92% of the time on Saturdays and just 51% on Thursdays. That gap is worth planning around.

Lagging the BOS–LGA route.

DL 5721 arrived on time 68% of the time, versus 78% across the BOS–LGA route.

Lagging the Delta Air Lines network.

DL 5721 arrived on time 68% of the time, versus 81% across the Delta Air Lines network.

Keep a backup plan handy.

DL 5721 was cancelled 8.5% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon73%(41 flights)
  • Tue74%(43 flights)
  • Wed63%(41 flights)
  • Thu51%(41 flights)
  • Fri67%(42 flights)
  • Sat92%(49 flights)
  • Sun54%(46 flights)
On-time by departure window
  • 9 AM–12 PM—(1 flights)
  • 12–3 PM—(5 flights)
  • 3–6 PM68%(297 flights)
On-time trend by month
73%
May

Jun 65% → May 73% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202565%26
July 202556%25
August 202580%30
September 202570%27
October 202552%29
November 202567%27
December 202579%28
January 202687%15
February 202680%15
March 202648%21
April 202670%30
May 202673%30
Departures on time
67%
Diverted
0%
Flights flown
303
Months covered
12

Same route, other flights

Keep nerding

Based on 331 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.