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Flight Reliability

DL 1998 · Delta Air Lines

Louisville → Atlanta (SDF–ATL)

96
Nerd Approved
WanderNerd Reliability Score
94%
Arrive within 15 minutes
14 min early
Average arrival delay
1.5%
Cancelled
19 min early
Median arrival delay

Based on 195 historical flights. Data through May 2026.

What the data says

Monday is the weak spot.

DL 1998 arrived on time 100% of the time on Thursdays. On Mondays: 86%.

A bit ahead of the SDF–ATL route.

DL 1998 arrived on time 94% of the time, versus 89% across the SDF–ATL route.

Better than the Delta Air Lines network average.

DL 1998 arrived on time 94% of the time, versus 81% across the Delta Air Lines network.

Recent months have been rougher.

DL 1998 arrived on time 88% of the time over the last three months in the data, compared with 98% in the three months before that.

The breakdown

On-time by weekday
  • Mon86%(28 flights)
  • Tue93%(28 flights)
  • Wed93%(28 flights)
  • Thu100%(28 flights)
  • Fri96%(28 flights)
  • Sat96%(26 flights)
  • Sun96%(26 flights)
On-time by departure window
  • 3–6 AM—(1 flights)
  • 6–9 AM94%(191 flights)
On-time trend by month
74%
Dec

Jun 95% → Dec 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202595%21
July 202597%31
August 202597%31
September 2025100%30
October 202597%31
November 202593%29
December 202574%19
Departures on time
96%
Diverted
0%
Flights flown
192
Months covered
7

Same route, other flights

Keep nerding

Based on 195 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.