MCI to SEA flight delays & on-time performance
Nonstop flights from Kansas City International Airport to Seattle–Tacoma International Airport · 1,490 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at MCI or SEA right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Kansas City (MCI) to Seattle (SEA) arrived on time 85% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 1.1% were cancelled, and 4% arrived an hour or more late.
- Delta Air Lines was the most punctual airline here (86% on time); Alaska Airlines was the least (85%).
- Departures scheduled around 2pm did best (91% on time); around 7pm did worst (71%).
- Monday was the most reliable day to fly (88% on time) and Friday the least (78%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (49%).
Which airline is most on time from MCI to SEA?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Delta Air Lines | 86% | 1.6% | 11 min | 3.7% | 364 |
| Alaska Airlines | 85% | 0.8% | 11 min | 3.8% | 749 |
| Southwest Airlines | 72% | 0.0% | 14 min | 5.6% | 18 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am89%182 flights
- 7am88%468 flights
- 2pm91%220 flights
- 3pm72%128 flights
- 7pm71%120 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday88%1.2% cancelled
- Tuesday86%0.0% cancelled
- Wednesday88%0.7% cancelled
- Thursday87%0.0% cancelled
- Friday78%1.2% cancelled
- Saturday86%3.1% cancelled
- Sunday81%1.2% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Airline (crew, maintenance, cleaning, fueling)49%
- Late-arriving aircraft27%
- Air traffic control & airport congestion21%
- Extreme weather3%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)92%
- Extreme weather8%
- Air traffic control & airport congestion0%
- Security0%
MCI to SEA: common questions
- How often are MCI to SEA flights on time?
- 85% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Kansas City to Seattle cancelled?
- 1.1% of scheduled flights were cancelled (12 of 1,131).
- How long are typical delays?
- Across all flights the average arrival delay was 11 min (early arrivals count as zero). Flights that were late arrived 66 min behind schedule on average, and 3.8% of flights were an hour or more late.
- How long is taxi time at MCI?
- Flights on this route spent 18 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SEA to MCI — 80% on time
More flights from Kansas City
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: MCI → SEA, nonstop flights by US airlines that report to the DOT. How we calculate this.