PlainFlights

Route · SEA → MCI · 2020–2025 BTS data

Seattle to Kansas City

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SEA to MCI (Seattle to Kansas City) ranks #2157 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

81.5%
On-time
+2.5 pts
vs US avg
60 min
Delay when late
5,803
Flights
#2157 of 4927
Corpus placement

Cancelled

1.1%

Best Month

Jan 2025 91%

Worst Month

Jul 2025 57%

Distance

1,489 mi

Carriers

14

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 85 21 2 0 DL,AS
Nov 2025 79 16 0 0 DL,AS
Oct 2025 88 21 2 0 AS,DL
Sep 2025 111 30 1 1 DL,WN,AS
Aug 2025 121 37 1 0 WN,AS,DL
Jul 2025 127 55 0 1 AS,DL,WN
Jun 2025 124 42 1 1 AS,WN,DL
May 2025 105 25 0 0 AS,DL
Apr 2025 85 12 1 1 DL,AS
Mar 2025 78 7 0 0 AS,DL
Feb 2025 63 11 1 0 AS,DL
Jan 2025 68 6 5 1 AS,DL
Dec 2024 85 22 0 0 AS,DL
Nov 2024 79 14 0 0 AS,DL
Oct 2024 87 10 0 0 AS,DL
Sep 2024 116 28 0 0 WN,AS,DL
Aug 2024 127 30 0 1 AS,DL,WN
Jul 2024 131 36 3 1 AS,DL,WN
Jun 2024 128 32 1 0 AS,DL,WN
May 2024 109 21 0 0 AS,DL
Apr 2024 90 27 0 0 AS,DL
Mar 2024 87 11 0 1 AS,DL
Feb 2024 67 12 0 0 AS,DL
Jan 2024 67 16 7 0 AS,DL

SEA–MCI seasonal on-time pattern

Best: March (87.6%) · weakest: June (74.2%)

70%75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 77.2%

Strongest calendar month

March

87.6% on-time · ~74 flights/mo

Busiest calendar month

August

~113 flights/mo avg

Weakest calendar month

June

74.2% on-time · ~102 flights/mo

Cancellation Rate

1.1%

25 of 2,307 flights

Diversion Rate

0.3%

8 of 2,307 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

MCI - Kansas City

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

MCI on-time profile

Compare the two airports

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

Compare SEA vs MCI

Origin-hub reliability standing

Mid-pack among SEA departures

From SEA, this corridor sits with 63 other 75–85% on-time routes out of 89 tracked departures, not the hub's reliability leaders (25 at ≥85%) and not the softest ( 1 below 75%). Destination: Kansas City · fleet on-time rank #2558 of 4927.

What the Data Says About SEA to MCI

5,803 tracked flights put the SEA to MCI pairing (Seattle to Kansas City) at a 81.5% on-time rate, squarely in line with the wider network. Delays that do occur run 60.0 minutes on average. Across the 1,489-mile route and its 14 carriers, the trailing 24 months show 1.1% cancelled and 0.3% diverted (2,307 flights sampled).

The monthly split is wide on this route: Jan 2025 posted the strongest performance at 91% on-time, while Jul 2025 came in at just 57% - a 35-point swing worth factoring into travel timing.

On the multi-year calendar, SEA–MCI peaks in March at 87.6% on-time while August carries the heaviest traffic (~113 flights per month) ; the softest month is June at 74.2%, a 13.4-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SEA to MCI rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SEA to MCI ranks #2157 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 MCI? ▼
Flights from Seattle to Kansas City have a 81.5% on-time rate based on 5,803 flights. The average delay is 60.0 minutes. The best recent month was Jan 2025 with 91% on-time.
What is the cancellation rate for SEA to MCI? ▼
Over the last 24 months, 1.1% of flights on this route were cancelled (25 of 2,307 flights) and 0.3% were diverted.
How far is the flight from SEA to MCI? ▼
The flight distance from Seattle (SEA) to Kansas City (MCI) is approximately 1,489 miles. This route is served by 14 carriers.
When is the best time to fly from SEA to MCI? ▼
The best recent month for on-time performance was Jan 2025 (91% on-time). The worst was Jul 2025 (57% on-time). Consider booking during months with historically better performance.

Airports on this route

SEA Airport

Seattle
MCI Airport

Kansas City
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–MCI data

SEA–MCI is mid-pack at 81.5% on-time; month and carrier mix move more than the corridor headline.

  • Compare SEA and MCI airport profiles: delay causes and top routes differ even on the same corridor. SEA airport
  • If your dates flex, March (87.6% on-time) beats June (74.2%) on this corridor. Seasonal chart
  • 4 other routes post a similar 81.5% 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.