MCI (Kansas City) to SEA (Seattle) flights arrive on time 84% of the time. The most reliable airline on this route is Delta Air Lines at 90%. The average delay is 61 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Source: Bureau of Transportation Statistics. Updated March 2026.MCI → SEA
MCI (Kansas City) to SEA (Seattle)
MCI → SEA on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is on time most of the time. About 84% of flights arrive on schedule.
Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Accurate?
Delta Air Lines edges out Alaska Airlines on this route — 90% vs 83% on time.
Airline Comparison
Delta Air Lines leads at 90% on time; Alaska Airlines trails at 83%.
Accurate?
Good to know
Departing from MCI
81% on timeTSA is currently ~22 min. Best time: 4 AM (about 5 min).
Arriving at SEA
82% on timeWhen flights into SEA are late, the average delay is 57 minutes. Build buffer if you have ground plans.
If connecting at SEA: TSA is ~10 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what Delta Air Lines owes you — refund rights, action plan, complaint email. Free.
Free flight briefing
Know before you go
Flying MCI → SEA? We'll brief you before takeoff.
Delay riskDOT stats + live data
TSA waitCurrent checkpoint lines
WeatherBoth airports
Gate & terminalLive updates
Know someone flying soon?
Send them the link — delay data, TSA waits, weather, all free.
Data last updated March 2026. Source: Bureau of Transportation Statistics.