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Flight Reliability

DL 5203 · Delta Air Lines

Atlanta → Knoxville (ATL–TYS)96% of its flights flew this route. The rest (TYS–ATL) are included in these numbers.

75
Usually Fine
WanderNerd Reliability Score
74%
Arrive within 15 minutes
15 min
Average arrival delay
1.1%
Cancelled
6 min early
Median arrival delay

Based on 368 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

DL 5203 departing between 3–6 PM arrived on time 87% of the time, versus 72% between 6–9 PM.

Friday is doing you no favors.

DL 5203 arrived on time 90% of the time on Saturdays and just 64% on Fridays. That gap is worth planning around.

A bit behind the ATL–TYS route.

DL 5203 arrived on time 74% of the time, versus 79% across the ATL–TYS route.

Lagging the Delta Air Lines network.

DL 5203 arrived on time 74% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon74%(54 flights)
  • Tue64%(50 flights)
  • Wed77%(51 flights)
  • Thu79%(53 flights)
  • Fri64%(52 flights)
  • Sat90%(50 flights)
  • Sun72%(54 flights)
On-time by departure window
  • 12–3 PM83%(12 flights)
  • 3–6 PM87%(45 flights)
  • 6–9 PM72%(307 flights)
On-time trend by month
71%
May

Jun 53% → May 71% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202553%30
July 202571%31
August 202571%31
September 202583%30
October 202590%30
November 202579%28
December 202577%43
January 202682%33
February 202670%20
March 202659%27
April 202680%30
May 202671%31
Departures on time
74%
Diverted
0%
Flights flown
364
Months covered
12

Same route, other flights

Keep nerding

Based on 368 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.