Best Time to Fly MKE to SEA: On-Time Stats by Hour & Airline
General Mitchell International → Seattle/Tacoma International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 80.2% of Milwaukee (MKE) to Seattle (SEA) flights arrived on time (509 scheduled flights). That is 2.6 points above the national average of 77.6%.
Alaska Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Saturday was the most reliable day (89% on time) and December the worst month (68%).
The cancellation rate was 0.4% (US average 1.8%).
MKE 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 |
|---|---|---|---|---|
| Alaska Airlines | 80.2% | 38 min | 0.4% | 509 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MKE to SEA
On-time arrival % by scheduled departure hour (local time), 965 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 91.7% | 1.0% | 194 |
| 7am–8am | 82.2% | 0.0% | 129 |
| 9am–10am | Limited data | 1 | |
| 1pm–2pm | Limited data | 1 | |
| 2pm–3pm | 82.2% | 0.3% | 383 |
| 3pm–4pm | 77.9% | 0.5% | 224 |
| 4pm–5pm | 75.8% | 0.0% | 33 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on MKE 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) | Limited data | 18 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 70.7% | -13.9 pts | 0.0% | 41 |
| Summer peak (Jun 15 - Aug 15) | 82.9% | -1.7 pts | 0.4% | 246 |
| All other days | 84.6% | — | 0.5% | 660 |
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).