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Flight Reliability

DL 5103 · Delta Air Lines

New York → Raleigh–Durham (JFK–RDU)92% of its flights flew this route. The rest (BUF–JFK, JFK–BUF) are included in these numbers.

40
Bring Snacks
WanderNerd Reliability Score
72%
Arrive within 15 minutes
17 min
Average arrival delay
8.7%
Cancelled
10 min early
Median arrival delay

Based on 379 historical flights. Data through May 2026.

What the data says

Sunday scaries are real for this one.

DL 5103 arrived on time 81% of the time on Fridays and just 61% on Sundays. That gap is worth planning around.

A bit behind the JFK–RDU route.

DL 5103 arrived on time 72% of the time, versus 76% across the JFK–RDU route.

Lagging the Delta Air Lines network.

DL 5103 arrived on time 72% of the time, versus 81% across the Delta Air Lines network.

Keep a backup plan handy.

DL 5103 was cancelled 8.7% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon68%(47 flights)
  • Tue80%(50 flights)
  • Wed65%(49 flights)
  • Thu67%(51 flights)
  • Fri81%(48 flights)
  • Sat78%(51 flights)
  • Sun61%(49 flights)
On-time by departure window
  • 12–3 PM71%(14 flights)
  • 3–6 PM71%(14 flights)
  • 6–9 PM71%(313 flights)
  • 9 PM–12 AM—(4 flights)
On-time trend by month
63%
May

Jun 50% → May 63% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202550%26
July 202555%22
August 202570%30
September 202586%29
October 202573%30
November 202585%27
December 202566%38
January 202682%28
February 202692%25
March 202667%30
April 202670%30
May 202663%30
Departures on time
70%
Diverted
0.3%
Flights flown
345
Months covered
12

Same route, other flights

Keep nerding

Based on 379 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.