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Flight Reliability

DL 812 · Delta Air Lines

Seattle → Detroit (SEA–DTW)

95
Nerd Approved
WanderNerd Reliability Score
93%
Arrive within 15 minutes
5 min early
Average arrival delay
1.1%
Cancelled
14 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 6–9 AM arrived on time 94% of the time, against 89% between 3–6 AM.

Friday is doing you no favors.

DL 812 arrived on time 96% of the time on Mondays. On Fridays: 87%.

Better than the SEA–DTW route average.

DL 812 arrived on time 93% of the time, versus 84% across the SEA–DTW route.

Better than the Delta Air Lines network average.

DL 812 arrived on time 93% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon96%(52 flights)
  • Tue96%(50 flights)
  • Wed90%(51 flights)
  • Thu92%(52 flights)
  • Fri87%(52 flights)
  • Sat92%(52 flights)
  • Sun94%(51 flights)
On-time by departure window
  • 3–6 AM89%(78 flights)
  • 6–9 AM94%(282 flights)
On-time trend by month
87%
May

Jun 97% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202597%30
July 202589%28
August 202584%31
September 202593%30
October 202597%31
November 2025100%30
December 202584%31
January 202694%31
February 202696%28
March 202693%30
April 202697%30
May 202687%30
Departures on time
94%
Diverted
0.3%
Flights flown
360
Months covered
12

Same route, other flights

Keep nerding

Based on 365 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.