Historical on-time performance
Seattle to Kansas City
1,489 miData through Dec 2025Source: US DOT · BTS
Flights on SEA–MCI arrive on time 73% of the time over the last 12 months.
On-time rate73%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled1.3%of scheduled flights
based on 1,051 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- Alaska AirlinesOn-time73%Medianon timep9040 minCancel1.1%Flights744
- Delta Air LinesOn-time75%Medianon timep9060 minCancel2.0%Flights307
Why flights run late
Delay causes
- Airline53%
- Weather3%
- Air traffic (NAS)17%
- Late aircraft27%
- Security0%
Most delay minutes here are attributed to Airline.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly SEA → MCI
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 81% on time.
- Mornings81% on time · p90 25 min · 955 flights
- Evenings75% on time · p90 45 min · 1,935 flights
- Middays70% on time · p90 30 min · 514 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 81% on time.
- Tuesdays81% on time · p90 25 min · 463 flights
- Saturdays78% on time · p90 35 min · 472 flights
- Wednesdays77% on time · p90 30 min · 463 flights
- Mondays76% on time · p90 30 min · 507 flights
- Fridays76% on time · p90 40 min · 511 flights
- Thursdays73% on time · p90 40 min · 503 flights
- Sundays73% on time · p90 45 min · 521 flights
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