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Route Reliability

Kailua-Kona → Seattle

KOA–SEA · 2,688 miles · Ellison Onizuka Kona International Airport to Seattle–Tacoma International Airport

85
Pretty Reliable
WanderNerd Reliability Score
87%
Arrive within 15 minutes
4 min early
Average arrival delay
2.3%
Cancelled
1,422
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.Delta Air Lines92%365 flights
  2. 2.Alaska Airlines85%1,057 flights

What the data says

The late departure is the smart one here.

KOA–SEA flights departing between 6–9 PM arrived on time 91% of the time, versus 74% between 12–3 PM.

Tuesday has been the better bet.

A small edge: 90% on time on Tuesdays against 84% on Sundays.

Delta Air Lines has a slight edge here.

Delta Air Lines arrived on time 92% of the time on this route; Alaska Airlines managed 85%.

Ticking up lately.

KOA–SEA flights arrived on time 89% of the time over the last three months in the data, compared with 84% in the three months before that.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon84%(200 flights)
  • Tue90%(192 flights)
  • Wed89%(196 flights)
  • Thu88%(200 flights)
  • Fri89%(196 flights)
  • Sat86%(199 flights)
  • Sun84%(206 flights)
On-time by departure window
  • 6–9 AM89%(270 flights)
  • 9 AM–12 PM84%(329 flights)
  • 12–3 PM74%(83 flights)
  • 6–9 PM91%(163 flights)
  • 9 PM–12 AM89%(544 flights)
On-time trend by month
86%
May

Jun 83% → May 86% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%117
July 202592%120
August 202592%118
September 202586%110
October 202585%118
November 202588%111
December 202582%117
January 202683%124
February 202687%111
March 202687%121
April 202694%110
May 202686%112

Keep nerding

Based on 1,422 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.