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Flight Reliability

DL 518 · Delta Air Lines

Atlanta → Boston (ATL–BOS)95% of its flights flew this route. The rest (MCO–BOS, BOS–LGA) are included in these numbers.

54
A Little Dicey
WanderNerd Reliability Score
59%
Arrive within 15 minutes
26 min
Average arrival delay
1.1%
Cancelled
9 min
Median arrival delay

Based on 280 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

DL 518 departing between 3–6 PM arrived on time 60% of the time, versus 25% between 6–9 PM.

Tuesdays have been rough.

DL 518 arrived on time 75% of the time on Saturdays and just 43% on Tuesdays. That gap is worth planning around.

Well behind the ATL–BOS route.

DL 518 arrived on time 59% of the time, versus 74% across the ATL–BOS route.

Well behind the Delta Air Lines network.

DL 518 arrived on time 59% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon60%(47 flights)
  • Tue43%(37 flights)
  • Wed71%(35 flights)
  • Thu65%(43 flights)
  • Fri50%(46 flights)
  • Sat75%(24 flights)
  • Sun53%(45 flights)
On-time by departure window
  • 9 AM–12 PM—(1 flights)
  • 3–6 PM60%(264 flights)
  • 6–9 PM25%(12 flights)
On-time trend by month
70%
May

Jun 62% → May 70% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202562%21
July 202543%28
August 202580%30
September 202550%22
October 202550%28
November 202563%30
December 202561%28
January 202646%13
March 202643%21
April 202650%20
May 202670%27
Departures on time
60%
Diverted
0%
Flights flown
277
Months covered
12

Same route, other flights

Keep nerding

Based on 280 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.