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Flight Reliability

DL 558 · Delta Air Lines

Seattle → Cincinnati (SEA–CVG)96% of its flights flew this route. The rest (CVG–SEA) are included in these numbers.

88
Pretty Reliable
WanderNerd Reliability Score
87%
Arrive within 15 minutes
2 min early
Average arrival delay
0.8%
Cancelled
12 min early
Median arrival delay

Based on 362 historical flights. Data through May 2026.

What the data says

The 9 AM–12 PM departure wins.

DL 558 departing between 9 AM–12 PM arrived on time 88% of the time, versus 67% between 6–9 AM.

Sunday scaries are real for this one.

DL 558 arrived on time 96% of the time on Fridays and just 81% on Sundays. That gap is worth planning around.

A bit ahead of the SEA–CVG route.

DL 558 arrived on time 87% of the time, versus 82% across the SEA–CVG route.

A bit ahead of the Delta Air Lines network.

DL 558 arrived on time 87% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon86%(50 flights)
  • Tue83%(52 flights)
  • Wed85%(52 flights)
  • Thu90%(51 flights)
  • Fri96%(49 flights)
  • Sat88%(50 flights)
  • Sun81%(52 flights)
On-time by departure window
  • 6–9 AM67%(15 flights)
  • 9 AM–12 PM88%(341 flights)
On-time trend by month
90%
May

Jun 93% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%30
July 202570%30
August 202583%30
September 202597%30
October 202597%30
November 202589%28
December 202583%30
January 202680%30
February 202689%28
March 202687%30
April 202683%29
May 202690%31
Departures on time
89%
Diverted
0.8%
Flights flown
356
Months covered
12

Same route, other flights

Keep nerding

Based on 362 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.