Best Time to Fly MCI to SEA: On-Time Stats by Hour & Airline
Kansas City International → Seattle/Tacoma International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 85.0% of Kansas City (MCI) to Seattle (SEA) flights arrived on time (1,131 scheduled flights). That is 7.4 points above the national average of 77.6%.
Among 2 airlines, Delta Air Lines led with 86.4% on time and Alaska Airlines was last with 84.6%.
Over 24 months, Tuesday was the most reliable day (88% on time) and December the worst month (79%).
The cancellation rate was 1.1% (US average 1.8%).
MCI to SEA on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Lines | 86.4% | 77 min | 1.6% | 364 |
| Alaska Airlines | 84.6% | 63 min | 0.8% | 749 |
| Southwest Airlines | Limited data | 18 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MCI to SEA
On-time arrival % by scheduled departure hour (local time), 2,275 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 90.8% | 1.1% | 553 |
| 7am–8am | 88.8% | 1.3% | 766 |
| 8am–9am | Limited data | 1 | |
| 9am–10am | Limited data | 8 | |
| 10am–11am | Limited data | 1 | |
| 1pm–2pm | Limited data | 12 | |
| 2pm–3pm | 90.5% | 1.2% | 417 |
| 3pm–4pm | 77.6% | 0.4% | 236 |
| 4pm–5pm | Limited data | 23 | |
| 5pm–6pm | Limited data | 10 | |
| 7pm–8pm | 62.6% | 0.4% | 248 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on MCI to SEA
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 71.0% | -15.4 pts | 0.0% | 38 |
| Christmas & New Year (Dec 20 - Jan 3) | 92.0% | +5.6 pts | 1.1% | 90 |
| Summer peak (Jun 15 - Aug 15) | 80.3% | -6.1 pts | 0.6% | 512 |
| All other days | 86.4% | — | 1.2% | 1,635 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).