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Flight Reliability

DL 900 · Delta Air Lines

Boston → Atlanta (BOS–ATL)86% of its flights flew this route. The rest (DTW–ORD, ORD–DTW) are included in these numbers.

63
A Little Dicey
WanderNerd Reliability Score
66%
Arrive within 15 minutes
15 min
Average arrival delay
2.1%
Cancelled
7 min early
Median arrival delay

Based on 242 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

DL 900 departing between 6–9 PM arrived on time 68% of the time, versus 57% between 9 PM–12 AM.

Thursdays have been rough.

DL 900 arrived on time 75% of the time on Mondays and just 56% on Thursdays. That gap is worth planning around.

Lagging the BOS–ATL route.

DL 900 arrived on time 66% of the time, versus 79% across the BOS–ATL route.

Well behind the Delta Air Lines network.

DL 900 arrived on time 66% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon75%(44 flights)
  • Tue58%(19 flights)
  • Wed75%(24 flights)
  • Thu56%(41 flights)
  • Fri65%(43 flights)
  • Sat65%(23 flights)
  • Sun65%(43 flights)
On-time by departure window
  • 12–3 PM68%(34 flights)
  • 6–9 PM68%(161 flights)
  • 9 PM–12 AM57%(42 flights)
On-time trend by month
67%
May

Jun 44% → May 67% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202544%18
July 202553%19
August 202556%16
September 202558%12
October 202581%16
November 202557%14
December 202568%28
January 202666%44
February 202691%11
March 202681%16
April 202672%25
May 202667%18
Departures on time
63%
Diverted
0%
Flights flown
237
Months covered
12

Same route, other flights

Keep nerding

Based on 242 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.