Skip to content
WanderNerd
Check a flight

Flight Reliability

DL 384 · Delta Air Lines

Boston → Seattle (BOS–SEA)

76
Usually Fine
WanderNerd Reliability Score
76%
Arrive within 15 minutes
4 min
Average arrival delay
1.6%
Cancelled
2 min
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

Tuesday is the weak spot.

DL 384 arrived on time 82% of the time on Fridays. On Tuesdays: 68%.

A bit ahead of the BOS–SEA route.

DL 384 arrived on time 76% of the time, versus 71% across the BOS–SEA route.

A bit behind the Delta Air Lines network.

DL 384 arrived on time 76% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon74%(49 flights)
  • Tue68%(50 flights)
  • Wed77%(51 flights)
  • Thu73%(52 flights)
  • Fri82%(51 flights)
  • Sat77%(52 flights)
  • Sun81%(53 flights)
On-time by departure window
  • 6–9 AM76%(353 flights)
  • 9 AM–12 PM—(5 flights)
On-time trend by month
84%
May

Jun 77% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202577%30
July 202579%29
August 202597%31
September 202587%30
October 202581%31
November 202583%30
December 202567%30
January 202667%30
February 202669%26
March 202637%30
April 202683%30
May 202684%31
Departures on time
89%
Diverted
0.3%
Flights flown
358
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.