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Route · KOA → SEA · 2020–2025 BTS data

Kona to Seattle

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), KOA to SEA (Kona to Seattle) ranks #1742 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

83.6%
On-time
+4.6 pts
vs US avg
69 min
Delay when late
7,238
Flights
#1742 of 4927
Corpus placement

Cancelled

2.4%

Best Month

Nov 2024 93%

Worst Month

May 2024 79%

Distance

2,688 mi

Carriers

3

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 123 21 6 0 DL,AS
Nov 2025 118 13 7 0 AS,DL
Oct 2025 122 18 4 0 AS,DL
Sep 2025 111 15 1 0 DL,AS
Aug 2025 121 10 3 0 AS,DL
Jul 2025 123 12 3 0 AS,DL
Jun 2025 120 20 2 1 AS,DL
May 2025 124 22 0 0 AS,DL
Apr 2025 120 23 0 0 AS,DL
Mar 2025 124 14 2 0 AS,DL
Feb 2025 111 15 1 0 AS,DL
Jan 2025 123 21 4 0 AS,DL
Dec 2024 108 13 2 0 AS,DL
Nov 2024 98 7 0 1 AS,DL
Oct 2024 123 22 1 0 AS,DL
Sep 2024 120 12 0 0 AS,DL
Aug 2024 124 15 1 0 AS,DL
Jul 2024 124 14 1 0 AS,DL
Jun 2024 120 11 1 0 AS,DL
May 2024 112 23 0 1 AS,DL
Apr 2024 106 10 2 0 AS,DL
Mar 2024 121 24 2 0 AS,DL
Feb 2024 104 20 3 1 AS,DL
Jan 2024 109 16 21 0 AS,DL

KOA–SEA seasonal on-time pattern

Best: September (88.7%) · weakest: December (78.6%)

75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 78.6%

Strongest calendar month

September

88.7% on-time · ~114 flights/mo

Busiest calendar month

July

~123 flights/mo avg

Weakest calendar month

December

78.6% on-time · ~107 flights/mo

Cancellation Rate

2.4%

67 of 2,809 flights

Diversion Rate

0.1%

4 of 2,809 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

KOA - Kona

Full on-time, delay-cause, and seasonal performance for Kona, HI.

KOA on-time profile

SEA - Seattle

Full on-time, delay-cause, and seasonal performance for Seattle, WA.

SEA on-time profile

Compare the two airports

See KOA and SEA side by side on delays, cancellations, and reliability.

Compare KOA vs SEA

Origin-hub reliability standing

Mid-pack among KOA departures

From KOA, this corridor sits with 4 other 75–85% on-time routes out of 13 tracked departures, not the hub's reliability leaders (9 at ≥85%) and not the softest ( 0 below 75%). Destination: Seattle · fleet on-time rank #1723 of 4927.

What the Data Says About KOA to SEA

Bureau of Transportation Statistics records show Kona to Seattle (KOA to SEA) running a 83.6% on-time rate over 7,238 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 68.5 minutes. The 2,688-mile corridor is served by 3 carriers, and over the last 24 months 2.4% of 2,809 flights were cancelled, 0.1% diverted.

Monthly performance varies moderately here: Nov 2024 was the strongest month at 93% on-time versus May 2024 at 79%, a 13-point difference.

On the multi-year calendar, KOA–SEA peaks in September at 88.7% on-time while July carries the heaviest traffic (~123 flights per month) ; the softest month is December at 78.6%, a 10.1-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does KOA to SEA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, KOA to SEA ranks #1742 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from KOA to SEA? ▼
Flights from Kona to Seattle have a 83.6% on-time rate based on 7,238 flights. The average delay is 68.5 minutes. The best recent month was Nov 2024 with 93% on-time.
What is the cancellation rate for KOA to SEA? ▼
Over the last 24 months, 2.4% of flights on this route were cancelled (67 of 2,809 flights) and 0.1% were diverted.
How far is the flight from KOA to SEA? ▼
The flight distance from Kona (KOA) to Seattle (SEA) is approximately 2,688 miles. This route is served by 3 carriers.
When is the best time to fly from KOA to SEA? ▼
The best recent month for on-time performance was Nov 2024 (93% on-time). The worst was May 2024 (79% on-time). Consider booking during months with historically better performance.

Airports on this route

KOA Airport

Kona
SEA Airport

Seattle
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using KOA–SEA data

KOA–SEA runs 4.6 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare KOA and SEA airport profiles: delay causes and top routes differ even on the same corridor. KOA airport
  • If your dates flex, September (88.7% on-time) beats December (78.6%) on this corridor. Seasonal chart
  • 4 other routes post a similar 83.6% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.