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Route · MCI → SEA · 2020–2025 BTS data

Kansas City to Seattle

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), MCI to SEA (Kansas City to Seattle) ranks #2158 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

86.7%
On-time
+7.7 pts
vs US avg
71 min
Delay when late
5,802
Flights
#2158 of 4927
Corpus placement

Cancelled

1.3%

Best Month

Oct 2024 98%

Worst Month

Dec 2025 67%

Distance

1,489 mi

Carriers

15

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 85 28 2 0 DL,AS
Nov 2025 79 12 0 0 DL,AS
Oct 2025 88 18 2 1 AS,DL
Sep 2025 111 17 2 1 DL,WN,AS
Aug 2025 121 23 1 0 WN,AS,DL
Jul 2025 127 30 0 0 AS,WN,DL
Jun 2025 124 32 2 0 AS,WN,DL
May 2025 105 15 1 0 AS,DL
Apr 2025 85 7 1 0 DL,AS
Mar 2025 79 12 1 1 AS,DL
Feb 2025 63 16 1 0 AS,DL
Jan 2025 67 7 6 0 AS,DL
Dec 2024 85 7 0 0 AS,DL
Nov 2024 79 7 0 0 AS,DL
Oct 2024 87 2 0 1 AS,DL
Sep 2024 116 12 0 1 WN,AS,DL
Aug 2024 127 22 0 1 AS,DL,WN
Jul 2024 131 27 3 0 AS,DL,WN
Jun 2024 128 32 2 0 AS,DL,WN
May 2024 109 19 0 0 AS,DL
Apr 2024 90 14 0 0 AS,DL
Mar 2024 87 5 0 0 AS,DL
Feb 2024 66 5 0 0 AS,DL
Jan 2024 68 20 7 0 AS,DL

MCI–SEA seasonal on-time pattern

Best: October (90.9%) · weakest: June (82.2%)

80%82%84%86%88%90%92% JanFebMarAprMayJunJulAugSepOctNovDec 83.3%

Strongest calendar month

October

90.9% on-time · ~83 flights/mo

Busiest calendar month

August

~113 flights/mo avg

Weakest calendar month

June

82.2% on-time · ~102 flights/mo

Cancellation Rate

1.3%

31 of 2,307 flights

Diversion Rate

0.3%

6 of 2,307 flights

Explore origin & destination

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

MCI - Kansas City

Full on-time, delay-cause, and seasonal performance for Kansas City, MO.

MCI 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 MCI and SEA side by side on delays, cancellations, and reliability.

Compare MCI vs SEA

Origin-hub reliability standing

Among MCI's stronger departures

MCI → SEA posts a 86.7% on-time rate, landing in the ≥85% band with 14 of 39 BTS-tracked routes leaving Kansas City. The same hub also shows 25 mid-band and 0 challenged departures · fleet-wide on-time rank #710 of 4927 (highest on-time = #1).

What the Data Says About MCI to SEA

Kansas City to Seattle (MCI to SEA) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 86.7% on-time rate across 5,802 flights, with delays that do happen averaging 71.0 minutes. The corridor runs roughly 1,489 miles and is served by 15 carriers. Over the most recent 24 months, 31 of 2,307 flights were cancelled (1.3%) and 6 diverted (0.3%).

The monthly split is wide on this route: Oct 2024 posted the strongest performance at 98% on-time, while Dec 2025 came in at just 67% - a 31-point swing worth factoring into travel timing.

On the multi-year calendar, MCI–SEA peaks in October at 90.9% on-time while August carries the heaviest traffic (~113 flights per month) ; the softest month is June at 82.2%, a 8.7-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does MCI to SEA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, MCI to SEA ranks #2158 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 MCI to SEA? ▼
Flights from Kansas City to Seattle have a 86.7% on-time rate based on 5,802 flights. The average delay is 71.0 minutes. The best recent month was Oct 2024 with 98% on-time.
What is the cancellation rate for MCI to SEA? ▼
Over the last 24 months, 1.3% of flights on this route were cancelled (31 of 2,307 flights) and 0.3% were diverted.
How far is the flight from MCI to SEA? ▼
The flight distance from Kansas City (MCI) to Seattle (SEA) is approximately 1,489 miles. This route is served by 15 carriers.
When is the best time to fly from MCI to SEA? ▼
The best recent month for on-time performance was Oct 2024 (98% on-time). The worst was Dec 2025 (67% on-time). Consider booking during months with historically better performance.

Airports on this route

MCI Airport

Kansas City
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 MCI–SEA data

MCI–SEA runs 7.7 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare MCI and SEA airport profiles: delay causes and top routes differ even on the same corridor. MCI airport
  • If your dates flex, October (90.9% on-time) beats June (82.2%) on this corridor. Seasonal chart
  • 4 other routes post a similar 86.7% 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.