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Flight Reliability

DL 817 · Delta Air Lines

Boston → Raleigh–Durham (BOS–RDU)94% of its flights flew this route. The rest (ATL–MEM, AGS–ATL) are included in these numbers.

44
Bring Snacks
WanderNerd Reliability Score
57%
Arrive within 15 minutes
31 min
Average arrival delay
2.6%
Cancelled
2 min
Median arrival delay

Based on 307 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

DL 817 departing between 9 AM–12 PM arrived on time 93% of the time, versus 55% between 6–9 PM.

Thursdays have been rough.

DL 817 arrived on time 65% of the time on Mondays and just 42% on Thursdays. That gap is worth planning around.

Well behind the BOS–RDU route.

DL 817 arrived on time 57% of the time, versus 77% across the BOS–RDU route.

Well behind the Delta Air Lines network.

DL 817 arrived on time 57% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon65%(48 flights)
  • Tue59%(51 flights)
  • Wed63%(48 flights)
  • Thu42%(48 flights)
  • Fri60%(48 flights)
  • Sat—(8 flights)
  • Sun48%(48 flights)
On-time by departure window
  • 9 AM–12 PM93%(15 flights)
  • 6–9 PM55%(284 flights)
On-time trend by month
64%
May

Jun 69% → May 64% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%26
July 202540%25
August 202548%25
September 202532%25
October 202524%25
November 202570%20
December 202569%26
January 202683%24
February 202668%25
March 202656%27
April 202665%26
May 202664%25
Departures on time
55%
Diverted
0%
Flights flown
299
Months covered
12

Same route, other flights

Keep nerding

Based on 307 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.