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Route · SEA → YKM · 2020–2025 BTS data

Seattle to Yakima

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SEA to YKM (Seattle to Yakima) ranks #4269 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

87.1%
On-time
+8.1 pts
vs US avg
53 min
Delay when late
1,337
Flights
#4269 of 4927
Corpus placement

Cancelled

2.0%

Best Month

Apr 2021 98%

Worst Month

Jun 2021 77%

Distance

103 mi

Carriers

1

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2022 31 9 1 0 QX
Oct 2022 31 4 0 0 QX
Sep 2022 35 7 0 0 QX
Aug 2022 62 6 0 0 QX
Jul 2022 62 4 2 0 QX
Jun 2022 60 9 1 0 QX
May 2022 62 7 2 0 QX
Apr 2022 60 8 2 0 QX
Mar 2022 62 6 1 0 QX
Feb 2022 56 6 0 0 QX
Jan 2022 62 13 7 0 QX
Dec 2021 62 14 5 0 QX
Nov 2021 55 9 1 0 QX
Oct 2021 68 3 0 0 QX
Sep 2021 83 6 0 0 QX
Aug 2021 62 12 0 0 QX
Jul 2021 62 11 0 0 QX
Jun 2021 60 14 0 0 QX
May 2021 62 4 1 0 QX
Apr 2021 60 1 0 0 QX
Mar 2021 62 8 0 0 QX
Feb 2021 56 7 4 0 QX
Jan 2021 62 5 0 0 QX

SEA–YKM seasonal on-time pattern

Best: October (92.9%) · weakest: December (75.3%)

70%75%80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 75.3%

Strongest calendar month

October

92.9% on-time · ~50 flights/mo

Busiest calendar month

January

~62 flights/mo avg

Weakest calendar month

December

75.3% on-time · ~47 flights/mo

Cancellation Rate

2.0%

27 of 1,337 flights

Diversion Rate

0.0%

0 of 1,337 flights

Explore origin & destination

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

SEA - Seattle

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

SEA on-time profile

YKM - Yakima

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

YKM on-time profile

Compare the two airports

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

Compare SEA vs YKM

Origin-hub reliability standing

Among SEA's stronger departures

SEA → YKM posts a 87.1% on-time rate, landing in the ≥85% band with 25 of 89 BTS-tracked routes leaving Seattle. The same hub also shows 63 mid-band and 1 challenged departures · fleet-wide on-time rank #620 of 4927 (highest on-time = #1).

What the Data Says About SEA to YKM

Seattle to Yakima (SEA to YKM) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 87.1% on-time rate across 1,337 flights, with delays that do happen averaging 53.3 minutes. The corridor runs roughly 103 miles and is served by 1 carrier. Over the most recent 24 months, 27 of 1,337 flights were cancelled (2.0%) and 0 diverted (0.0%).

The monthly split is wide on this route: Apr 2021 posted the strongest performance at 98% on-time, while Jun 2021 came in at just 77% - a 22-point swing worth factoring into travel timing.

On the multi-year calendar, SEA–YKM peaks in October at 92.9% on-time while January carries the heaviest traffic (~62 flights per month) ; the softest month is December at 75.3%, a 17.6-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SEA to YKM rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SEA to YKM ranks #4269 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 SEA to YKM? ▼
Flights from Seattle to Yakima have a 87.1% on-time rate based on 1,337 flights. The average delay is 53.3 minutes. The best recent month was Apr 2021 with 98% on-time.
What is the cancellation rate for SEA to YKM? ▼
Over the last 24 months, 2.0% of flights on this route were cancelled (27 of 1,337 flights) and 0.0% were diverted.
How far is the flight from SEA to YKM? ▼
The flight distance from Seattle (SEA) to Yakima (YKM) is approximately 103 miles. This route is served by 1 carrier.
When is the best time to fly from SEA to YKM? ▼
The best recent month for on-time performance was Apr 2021 (98% on-time). The worst was Jun 2021 (77% on-time). Consider booking during months with historically better performance.

Airports on this route

SEA Airport

Seattle
YKM Airport

Yakima
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 SEA–YKM data

SEA–YKM runs 8.1 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare SEA and YKM airport profiles: delay causes and top routes differ even on the same corridor. SEA airport
  • If your dates flex, October (92.9% on-time) beats December (75.3%) on this corridor. Seasonal chart
  • 4 other routes post a similar 87.1% 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.