Route on-time record
MKE to SEA: most on-time flights and the best time to fly
Milwaukee (General Mitchell International Airport) to Seattle (Seattle–Tacoma International Airport). 510 nonstop flights in Jun 2025 to May 2026, 80% arrived within 15 minutes and 0.6% were cancelled. The most reliable flight number was Alaska 1380 at 7:00 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
MKE → SEA
Milwaukee to Seattle: 510 nonstop flights a year
On time (12 months)
80%
Cancelled
0.6%
avg delay 10 min
Best time to leave
Before 9 AM
87% on time vs 74% noon to 3 PM
Most reliable airline
Alaska
79% chance on time
Lowest nonstop fare seen in the next two months: $191 (Alaska 507 on 2026-10-26). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Alaska 1380
7:00 AM → 9:27 AM4h 27m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
- On time (history)
- 97%
- Cancelled
- 0.0%
- Avg arrival delay
- 1 min
- Arrived on time 97% of the time (37 flights, Jun 2025 to May 2026).
- Never cancelled in 37 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 87% on time; Noon to 3 PM: 74%).
Limited track record · 37 flights
Find Alaska 1380 fares Opens this date on Aviasales#2 · Alaska 507
3:10 PM → 5:38 PM4h 28m nonstop
Local times, typical schedule. Last flown 2026-05-31.
77%
chance on time
- On time (history)
- 77%
- Cancelled
- 0.8%
- Avg arrival delay
- 12 min
- Arrived on time 77% of the time (126 flights, Jun 2025 to May 2026).
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Moderate track record · 126 flights
Find Alaska 507 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Alaska Airlines79%
510 flights · 80% on time as flown · 0.6% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM87%
184 flights · avg delay 7 min
- Noon to 3 PM74%
101 flights · avg delay 13 min
- 3 to 6 PM76%
225 flights · avg delay 11 min
Best day: Thursday (87%). Worst: Friday (83%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Airline (crew, maintenance, boarding)41%
- Air traffic control and airport volume35%
- Late-arriving aircraft14%
- Severe weather10%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
MKE to SEA questions
- What time of day is best to fly MKE to SEA?
- Before 9 AM: 87% of flights arrived on time, against 74% for departures noon to 3 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from MKE to SEA?
- Alaska, with a season-adjusted 79% chance of operating and arriving on time over 510 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on MKE to SEA?
- December (77% on time); the best was April (97%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from MKE
- SEA to MKE (return)
- MKE to ORD 67%
- MKE to DEN 78%
- MKE to ATL 89%
- MKE to DTW 81%
- MKE to PHX 79%
- MKE to MSP 82%
- MKE to MCO 76%
- MKE to DCA 75%
- MKE to LAS 82%
- MKE to DFW 74%
- MKE to BNA 82%
- MKE to CLT 79%
Most on-time flights from MKE on every route →
Live status: FAA delays and ground stops