Milwaukee (MKE) to Seattle (SEA): On-Time Performance
Data through July 2026
When you fly MKE to SEA matters as much as anything else about the booking: the route swung from 100% on-time in May 2025 to just 56% in December 2025. Across the full period the route averages 83% on-time against a national 78%.
- On-time
- 83%
- arrived <15 min late
- Avg delay
- 8 min
- completed flights
- Cancelled
- 0.4%
- Flights/day
- 1.4
- last 12 months
- Duration
- 4h 26m
- scheduled
- Distance
- 1,694 mi
Monthly on-time trend
Best time to fly from MKE to SEA
Aim for departures around 6 a.m. (92% on-time); avoid 4 p.m. departures (76%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 84% | 6 min |
| Tuesday | 77% | 9 min |
| Wednesday | 81% | 9 min |
| Thursday | 85% | 7 min |
| Friday | 83% | 9 min |
| Saturdaybest | 90% | 4 min |
| Sunday | 84% | 9 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft15%
- Airline operations36%
- National airspace system40%
- Weather8%
- Security2%
Frequently asked questions
- How often are flights from MKE to SEA delayed?
- 17% of MKE–SEA flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 8 minutes.
- What is the best time of day to fly from MKE to SEA?
- Departures around 6 a.m. have the best record (92% on-time), while departures around 4 p.m. have the worst (76%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from MKE to SEA?
- The scheduled MKE–SEA flight time averages 4h 26m over 1,694 miles. Actual arrival times vary — flights on this route land 15+ minutes late 17% of the time.
- How often are MKE to SEA flights cancelled?
- 0.4% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from MKE to SEA?
- December 2025 was the roughest month in this dataset, with only 56% of arrivals on time. The best was May 2025 at 100%. If your dates are flexible, that 44-point gap is worth planning around.
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Based on 1,027 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.