Best Time to Fly SEA to MKE: On-Time Stats by Hour & Airline
Seattle/Tacoma International → General Mitchell International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 85.6% of Seattle (SEA) to Milwaukee (MKE) flights arrived on time (509 scheduled flights). That is 7.9 points above the national average of 77.6%.
Alaska Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Friday was the most reliable day (89% on time) and August the worst month (76%).
The cancellation rate was 0.2% (US average 1.8%).
SEA to MKE 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 | 85.6% | 36 min | 0.2% | 509 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SEA to MKE
On-time arrival % by scheduled departure hour (local time), 965 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 91.1% | 0.4% | 281 |
| 8am–9am | 91.3% | 0.0% | 276 |
| 9am–10am | 83.2% | 0.9% | 114 |
| 11am–12pm | Limited data | 1 | |
| 5pm–6pm | Limited data | 3 | |
| 6pm–7pm | 73.4% | 0.0% | 289 |
| 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 MKE
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 | 17 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 85.4% | -1.4 pts | 0.0% | 41 |
| Summer peak (Jun 15 - Aug 15) | 80.3% | -6.5 pts | 0.0% | 246 |
| All other days | 86.8% | — | 0.3% | 661 |
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).