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Flight Reliability

DL 5273 · Delta Air Lines

Raleigh–Durham → Newark (RDU–EWR)96% of its flights flew this route. The rest (FAY–ATL, DCA–CVG) are included in these numbers.

69
Usually Fine
WanderNerd Reliability Score
72%
Arrive within 15 minutes
13 min
Average arrival delay
2.3%
Cancelled
3 min early
Median arrival delay

Based on 303 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

DL 5273 departing between 12–3 PM arrived on time 84% of the time, versus 69% between 9 AM–12 PM.

Wednesday is the weak spot.

DL 5273 arrived on time 78% of the time on Thursdays. On Wednesdays: 69%.

Lagging the Delta Air Lines network.

DL 5273 arrived on time 72% of the time, versus 81% across the Delta Air Lines network.

Recent months have been rougher.

DL 5273 arrived on time 70% of the time over the last three months in the data, compared with 77% in the three months before that.

The breakdown

On-time by weekday
  • Mon71%(49 flights)
  • Tue73%(51 flights)
  • Wed69%(49 flights)
  • Thu78%(46 flights)
  • Fri71%(49 flights)
  • Sat—(9 flights)
  • Sun70%(43 flights)
On-time by departure window
  • 6–9 AM71%(17 flights)
  • 9 AM–12 PM69%(223 flights)
  • 12–3 PM84%(55 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
80%
May

Jun 74% → May 80% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202574%19
July 202576%25
August 202560%25
September 202580%25
October 202565%26
November 202575%24
December 202558%26
January 202692%24
February 202681%21
March 202664%28
April 202664%28
May 202680%25
Departures on time
74%
Diverted
0%
Flights flown
296
Months covered
12

Same route, other flights

Keep nerding

Based on 303 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.