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Flight Reliability

DL 5321 · Delta Air Lines

ROA → New York (ROA–LGA)100% of its flights flew this route. The rest (DTW–GRR) are included in these numbers.

70
Usually Fine
WanderNerd Reliability Score
87%
Arrive within 15 minutes
5 min
Average arrival delay
6.1%
Cancelled
15 min early
Median arrival delay

Based on 311 historical flights. Data through May 2026.

What the data says

Thursday comes out ahead.

A small edge: 89% on time on Thursdays against 86% on Sundays.

Well ahead of the ROA–LGA route.

DL 5321 arrived on time 87% of the time, versus 72% across the ROA–LGA route.

A bit ahead of the Delta Air Lines network.

DL 5321 arrived on time 87% of the time, versus 81% across the Delta Air Lines network.

Keep a backup plan handy.

DL 5321 was cancelled 6.1% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon89%(44 flights)
  • Tue87%(45 flights)
  • Wed87%(47 flights)
  • Thu89%(46 flights)
  • Fri87%(46 flights)
  • Sat86%(14 flights)
  • Sun86%(49 flights)
On-time by departure window
  • 6–9 AM88%(282 flights)
  • 9 AM–12 PM—(8 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
90%
May

Jun 84% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202584%25
July 202596%22
August 202596%26
September 202596%26
October 202589%26
November 202583%24
December 202565%17
January 202685%20
February 202682%22
March 202689%26
April 202686%28
May 202690%29
Departures on time
89%
Diverted
0.3%
Flights flown
291
Months covered
12

Same route, other flights

Keep nerding

Based on 311 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.