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Flight Reliability

DL 4820 · Delta Air Lines

CHO → Atlanta (CHO–ATL)85% of its flights flew this route. The rest (ATL–XNA, CVG–DTW) are included in these numbers.

85
Pretty Reliable
WanderNerd Reliability Score
84%
Arrive within 15 minutes
0 min
Average arrival delay
1.9%
Cancelled
14 min early
Median arrival delay

Based on 208 historical flights. Data through May 2026.

What the data says

Thursdays have been rough.

DL 4820 arrived on time 97% of the time on Wednesdays and just 78% on Thursdays. That gap is worth planning around.

A bit ahead of the Delta Air Lines network.

DL 4820 arrived on time 84% of the time, versus 81% across the Delta Air Lines network.

Recent months have been rougher.

DL 4820 arrived on time 81% of the time over the last three months in the data, compared with 90% in the three months before that.

The breakdown

On-time by weekday
  • Mon78%(32 flights)
  • Tue88%(32 flights)
  • Wed97%(31 flights)
  • Thu78%(32 flights)
  • Fri84%(32 flights)
  • Sat85%(13 flights)
  • Sun81%(32 flights)
On-time by departure window
  • 9 AM–12 PM85%(192 flights)
  • 12–3 PM—(6 flights)
  • 3–6 PM—(5 flights)
  • 6–9 PM—(1 flights)
On-time trend by month
88%
Feb

Jun 64% → Feb 88% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202564%25
July 202593%27
August 202592%26
September 202592%26
October 202587%30
November 202583%29
December 202572%18
February 202688%17
Departures on time
82%
Diverted
0%
Flights flown
204
Months covered
9

Same route, other flights

Keep nerding

Based on 208 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.