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Flight Reliability

DL 340 · Delta Air Lines

Seattle → Kailua-Kona (SEA–KOA)96% of its flights flew this route. The rest (KOA–SEA) are included in these numbers.

76
Usually Fine
WanderNerd Reliability Score
78%
Arrive within 15 minutes
3 min
Average arrival delay
2.1%
Cancelled
7 min early
Median arrival delay

Based on 382 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

DL 340 departing between 12–3 PM arrived on time 82% of the time, versus 57% between 9 PM–12 AM.

Friday is doing you no favors.

DL 340 arrived on time 89% of the time on Wednesdays and just 68% on Fridays. That gap is worth planning around.

A bit ahead of the SEA–KOA route.

DL 340 arrived on time 78% of the time, versus 72% across the SEA–KOA route.

A bit behind the Delta Air Lines network.

DL 340 arrived on time 78% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon78%(54 flights)
  • Tue76%(54 flights)
  • Wed89%(52 flights)
  • Thu78%(54 flights)
  • Fri68%(50 flights)
  • Sat76%(54 flights)
  • Sun78%(55 flights)
On-time by departure window
  • 12–3 PM82%(252 flights)
  • 3–6 PM71%(106 flights)
  • 6–9 PM—(1 flights)
  • 9 PM–12 AM57%(14 flights)
On-time trend by month
77%
May

Jun 87% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202587%30
July 202577%31
August 202587%31
September 202590%30
October 202594%31
November 202572%29
December 202571%38
January 202672%36
February 202657%28
March 202654%28
April 202690%30
May 202677%31
Departures on time
83%
Diverted
0.3%
Flights flown
373
Months covered
12

Same route, other flights

Keep nerding

Based on 382 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.