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Flight Reliability

DL 554 · Delta Air Lines

Seattle → Atlanta (SEA–ATL)86% of its flights flew this route. The rest (ATL–AGS, BWI–ATL) are included in these numbers.

82
Pretty Reliable
WanderNerd Reliability Score
82%
Arrive within 15 minutes
2 min
Average arrival delay
0.6%
Cancelled
5 min early
Median arrival delay

Based on 352 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

DL 554 departing between 6–9 AM arrived on time 96% of the time, versus 81% between 9 AM–12 PM.

Saturdays have been rough.

DL 554 arrived on time 94% of the time on Wednesdays and just 69% on Saturdays. That gap is worth planning around.

Slipping a little lately.

DL 554 arrived on time 79% of the time over the last three months in the data, compared with 86% in the three months before that.

The breakdown

On-time by weekday
  • Mon80%(51 flights)
  • Tue85%(48 flights)
  • Wed94%(46 flights)
  • Thu88%(50 flights)
  • Fri86%(50 flights)
  • Sat69%(49 flights)
  • Sun75%(51 flights)
On-time by departure window
  • 6–9 AM96%(23 flights)
  • 9 AM–12 PM81%(297 flights)
  • 6–9 PM84%(25 flights)
On-time trend by month
71%
May

Jun 79% → May 71% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202579%28
July 202583%30
August 202587%30
September 202590%30
October 202577%30
November 202583%29
December 202574%31
January 202688%24
February 202695%21
March 202681%31
April 202687%30
May 202671%31
Departures on time
82%
Diverted
1.4%
Flights flown
345
Months covered
12

Same route, other flights

Keep nerding

Based on 352 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.