Skip to content
WanderNerd
Check a flight

Flight Reliability

DL 3678 · Delta Air Lines

Boise → Seattle (BOI–SEA)88% of its flights flew this route. The rest (CLE–DTW, DTW–CLE) are included in these numbers.

98
Nerd Approved
WanderNerd Reliability Score
93%
Arrive within 15 minutes
13 min early
Average arrival delay
0%
Cancelled
19 min early
Median arrival delay

Based on 385 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

DL 3678 departing between 6–9 AM arrived on time 94% of the time, versus 79% between 3–6 PM.

Skip Thursday if you can.

DL 3678 arrived on time 98% of the time on Fridays. On Thursdays: 87%.

Better than the BOI–SEA route average.

DL 3678 arrived on time 93% of the time, versus 82% across the BOI–SEA route.

Better than the Delta Air Lines network average.

DL 3678 arrived on time 93% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon96%(55 flights)
  • Tue98%(54 flights)
  • Wed89%(54 flights)
  • Thu87%(55 flights)
  • Fri98%(56 flights)
  • Sat90%(52 flights)
  • Sun89%(56 flights)
On-time by departure window
  • 6–9 AM94%(338 flights)
  • 9 AM–12 PM—(5 flights)
  • 12–3 PM85%(20 flights)
  • 3–6 PM79%(19 flights)
On-time trend by month
82%
May

Jun 100% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 2025100%30
July 202594%31
August 202597%31
September 2025100%30
October 202587%31
November 202597%30
December 202597%30
January 202690%30
February 202696%28
March 202687%31
April 202693%30
May 202682%50
Departures on time
94%
Diverted
0.8%
Flights flown
382
Months covered
12

Same route, other flights

Keep nerding

Based on 385 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.