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Flight Reliability

DL 3873 · Delta Air Lines

Seattle → LWS (SEA–LWS)

99
Nerd Approved
WanderNerd Reliability Score
92%
Arrive within 15 minutes
7 min early
Average arrival delay
0.3%
Cancelled
14 min early
Median arrival delay

Based on 364 historical flights. Data through May 2026.

What the data says

6–9 PM has a slight edge.

Departures between 6–9 PM arrived on time 93% of the time, against 89% between 9 PM–12 AM.

Thursday is the weak spot.

DL 3873 arrived on time 98% of the time on Tuesdays. On Thursdays: 85%.

Better than the Delta Air Lines network average.

DL 3873 arrived on time 92% of the time, versus 81% across the Delta Air Lines network.

It basically never cancels.

Out of 364 scheduled flights, only 0.3% were cancelled.

The breakdown

On-time by weekday
  • Mon94%(52 flights)
  • Tue98%(51 flights)
  • Wed96%(52 flights)
  • Thu85%(52 flights)
  • Fri90%(52 flights)
  • Sat92%(52 flights)
  • Sun89%(52 flights)
On-time by departure window
  • 6–9 PM93%(266 flights)
  • 9 PM–12 AM89%(97 flights)
On-time trend by month
90%
May

Jun 87% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202587%30
July 202594%31
August 202593%30
September 202597%30
October 202594%31
November 202597%30
December 202594%31
January 202690%30
February 202689%28
March 202697%31
April 202683%30
May 202690%31
Departures on time
92%
Diverted
0%
Flights flown
363
Months covered
12

Keep nerding

Based on 364 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.