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Flight Reliability

DL 5604 · Delta Air Lines

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

95
Nerd Approved
WanderNerd Reliability Score
91%
Arrive within 15 minutes
6 min early
Average arrival delay
1.0%
Cancelled
15 min early
Median arrival delay

Based on 306 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

DL 5604 departing between 6–9 AM arrived on time 93% of the time, versus 81% between 9 AM–12 PM.

Sunday scaries are real for this one.

DL 5604 arrived on time 100% of the time on Fridays and just 84% on Sundays. That gap is worth planning around.

Better than the Delta Air Lines network average.

DL 5604 arrived on time 91% of the time, versus 81% across the Delta Air Lines network.

Ticking up lately.

DL 5604 arrived on time 95% of the time over the last three months in the data, compared with 89% in the three months before that.

The breakdown

On-time by weekday
  • Mon98%(42 flights)
  • Tue88%(43 flights)
  • Wed88%(43 flights)
  • Thu93%(42 flights)
  • Fri100%(39 flights)
  • Sat89%(45 flights)
  • Sun84%(49 flights)
On-time by departure window
  • 6–9 AM93%(267 flights)
  • 9 AM–12 PM81%(36 flights)
On-time trend by month
100%
May

Jun 93% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%30
July 202593%28
August 202593%30
September 202593%30
October 202587%30
November 202586%28
December 202594%31
March 202687%23
April 202697%30
May 2026100%31
Departures on time
94%
Diverted
0%
Flights flown
303
Months covered
12

Keep nerding

Based on 306 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.