Historical on-time performance
Kansas City to Seattle
1,489 miData through Dec 2025Source: US DOT · BTS
Flights on MCI–SEA arrive on time 79% of the time over the last 12 months.
On-time rate79%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled1.8%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
- Delta Air LinesbestOn-time84%Medianon timep9025 minCancel2.0%Flights307
- Alaska AirlinesOn-time77%Medianon timep9040 minCancel1.7%Flights744
Why flights run late
Delay causes
- Airline47%
- Weather5%
- Air traffic (NAS)18%
- Late aircraft30%
- 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 MCI → SEA
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 — 89% on time.
- Mornings89% on time · p90 10 min · 2,032 flights
- Afternoons78% on time · p90 30 min · 827 flights
- Middays77% on time · p90 30 min · 136 flights · limited
- Evenings67% on time · p90 40 min · 423 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 80% to 87% on time.
- Tuesdays87% on time · p90 20 min · 468 flights
- Mondays85% on time · p90 25 min · 508 flights
- Saturdays84% on time · p90 20 min · 475 flights
- Thursdays83% on time · p90 25 min · 495 flights
- Wednesdays82% on time · p90 30 min · 465 flights
- Fridays82% on time · p90 25 min · 493 flights
- Sundays80% on time · p90 25 min · 535 flights
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