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Flight Reliability

DL 3855 · Delta Air Lines

Seattle → EUG (SEA–EUG)

97
Nerd Approved
WanderNerd Reliability Score
89%
Arrive within 15 minutes
2 min early
Average arrival delay
0%
Cancelled
12 min early
Median arrival delay

Based on 361 historical flights. Data through May 2026.

What the data says

9 PM–12 AM has a slight edge.

Departures between 9 PM–12 AM arrived on time 89% of the time, against 83% between 6–9 PM.

Monday comes out ahead.

A small edge: 90% on time on Mondays against 84% on Fridays.

A bit ahead of the SEA–EUG route.

DL 3855 arrived on time 89% of the time, versus 84% across the SEA–EUG route.

Better than the Delta Air Lines network average.

DL 3855 arrived on time 89% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon90%(52 flights)
  • Tue90%(52 flights)
  • Wed90%(52 flights)
  • Thu89%(52 flights)
  • Fri84%(51 flights)
  • Sat90%(50 flights)
  • Sun89%(52 flights)
On-time by departure window
  • 3–6 PM—(3 flights)
  • 6–9 PM83%(18 flights)
  • 9 PM–12 AM89%(340 flights)
On-time trend by month
97%
May

Jun 90% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%30
July 202590%31
August 202590%29
September 202587%30
October 202593%30
November 2025100%29
December 202590%31
January 202684%31
February 202686%28
March 202674%31
April 202687%30
May 202697%31
Departures on time
88%
Diverted
0%
Flights flown
361
Months covered
12

Same route, other flights

Keep nerding

Based on 361 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.