BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
MCI→SEA

Kansas City, MO (MCI) to Seattle, WA (SEA) flight delay odds

82.1% of 1,131 official scheduled MCI-to-SEA flights arrived on time; 9.6% arrived at least 30 minutes late and 1.1% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALLower disruption
82.1%arrived on time
9.6%30+ min late
1.1%cancelled
1,131scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.8%all scheduled flights
120+ minutes late2.1%all scheduled flights
Diverted0.5%did not reach as scheduled
Average arrival+3.5 mincompleted flights

Which departure time was most reliable for MCI to SEA?

Among qualifying MCI-to-SEA departure window results, Early morning had the highest on-time rate: 85.9% of 646 flights. Evening was lowest at 65.4% across 130 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning64685.9%6.5%1.4%
Afternoon35581.1%10.7%0.6%
Evening13065.4%22.3%0.8%

Which weekday was most reliable for MCI to SEA?

Among qualifying MCI-to-SEA weekday results, Tuesday had the highest on-time rate: 87.8% of 156 flights. Friday was lowest at 75.5% across 163 flights.

DayFlightsOn time30+ minCancelled
Monday16685.5%10.2%1.2%
Tuesday15687.8%7.7%0.0%
Wednesday15283.6%9.2%0.7%
Thursday16683.7%9.6%0.0%
Friday16375.5%12.9%1.2%
Saturday15780.9%7.6%3.2%
Sunday17177.8%9.9%1.2%

Which airline was most reliable for MCI to SEA?

Among qualifying MCI-to-SEA airline results, Delta Air Lines had the highest on-time rate: 83.0% of 364 flights. Alaska Airlines was lowest at 82.1% across 745 flights.

AirlineFlightsOn time30+ minCancelled
Alaska Airlines74582.1%9.9%0.8%
Delta Air Lines36483.0%8.0%1.6%
Southwest Airlines2263.6%27.3%0.0%

Which month was most reliable for MCI to SEA?

Among qualifying MCI-to-SEA month results, May 2026 had the highest on-time rate: 89.9% of 109 flights. December 2025 was lowest at 64.7% across 85 flights.

MonthFlightsOn time30+ minCancelled
July 202512776.4%22.0%0.0%
August 202512180.2%10.7%0.8%
September 202511182.0%6.3%1.8%
October 20258876.1%9.1%2.3%
November 20257984.8%6.3%0.0%
December 20258564.7%18.8%2.4%
January 20266877.9%10.3%1.5%
February 20265689.3%7.1%1.8%
March 20267486.5%4.1%1.4%
April 20269087.8%5.6%1.1%
May 202610989.9%6.4%0.9%
June 202612389.4%4.9%0.0%

What drove MCI to SEA delay minutes?

Airline was the largest recorded MCI-to-SEA delay category, accounting for 47.2% of 13,183 BTS-attributed delay minutes during July 2025–June 2026.

Airline47.2%
Late aircraft30.4%
National airspace19.7%
Weather2.8%
Security0.0%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.