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Flight Reliability

DL 855 · Delta Air Lines

Atlanta → Boston (ATL–BOS)

90
Nerd Approved
WanderNerd Reliability Score
88%
Arrive within 15 minutes
2 min early
Average arrival delay
1.6%
Cancelled
8 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

Skip Tuesday if you can.

DL 855 arrived on time 94% of the time on Fridays. On Tuesdays: 82%.

Better than the ATL–BOS route average.

DL 855 arrived on time 88% of the time, versus 74% across the ATL–BOS route.

Better than the Delta Air Lines network average.

DL 855 arrived on time 88% of the time, versus 81% across the Delta Air Lines network.

Trending in the right direction.

DL 855 arrived on time 95% of the time over the last three months in the data, compared with 81% in the three months before that.

The breakdown

On-time by weekday
  • Mon84%(50 flights)
  • Tue82%(51 flights)
  • Wed89%(52 flights)
  • Thu92%(52 flights)
  • Fri94%(52 flights)
  • Sat92%(50 flights)
  • Sun85%(52 flights)
On-time by departure window
  • 6–9 AM—(2 flights)
  • 9 AM–12 PM88%(357 flights)
On-time trend by month
97%
May

Jun 86% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202586%29
July 202594%31
August 202597%31
September 202577%30
October 202584%31
November 202593%30
December 202587%31
January 202664%28
February 202692%26
March 202694%31
April 202693%30
May 202697%31
Departures on time
85%
Diverted
0%
Flights flown
359
Months covered
12

Same route, other flights

Keep nerding

Based on 365 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.