Best Time to Fly SEA to MCI: On-Time Stats by Hour & Airline
Seattle/Tacoma International → Kansas City International
Data through July 2026 · Last updated October 18, 2026
1,131 flights were scheduled from Seattle (SEA) to Kansas City (MCI) in the last 12 months, and 80.2% of those that flew arrived on time, 2.6 points above the US average of 77.6%.
Among 2 airlines, Alaska Airlines led with 83.2% on time and Delta Air Lines was last with 76.3%.
Over 24 months, Tuesday was the most reliable day (81% on time) and July the worst month (67%).
The cancellation rate was 0.9% (US average 1.8%).
SEA to MCI 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 |
|---|---|---|---|---|
| Alaska Airlines | 83.2% | 46 min | 0.5% | 749 |
| Delta Air Lines | 76.3% | 77 min | 1.6% | 364 |
| Southwest Airlines | Limited data | 18 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SEA to MCI
On-time arrival % by scheduled departure hour (local time), 2,275 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 90.3% | 0.0% | 124 |
| 8am–9am | 90.5% | 0.8% | 384 |
| 9am–10am | 80.8% | 0.6% | 179 |
| 10am–11am | Limited data | 8 | |
| 11am–12pm | 58.1% | 0.0% | 31 |
| 12pm–1pm | 48.6% | 0.0% | 35 |
| 1pm–2pm | 72.3% | 0.0% | 217 |
| 2pm–3pm | Limited data | 2 | |
| 3pm–4pm | Limited data | 28 | |
| 4pm–5pm | Limited data | 5 | |
| 5pm–6pm | 77.3% | 1.5% | 472 |
| 6pm–7pm | 75.0% | 0.9% | 789 |
| 11pm–12am | Limited data | 1 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SEA to MCI
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) | 76.3% | -5.4 pts | 0.0% | 38 |
| Christmas & New Year (Dec 20 - Jan 3) | 77.5% | -4.2 pts | 1.1% | 90 |
| Summer peak (Jun 15 - Aug 15) | 68.6% | -13.1 pts | 0.4% | 512 |
| All other days | 81.7% | — | 0.9% | 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).