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Alaska Airlines / MKE → SEA

AS 507 on time

Alaska Airlines 507: Milwaukee to Seattle at 2:59 p.m.; Seattle to Milwaukee at 8:06 a.m. (past 12 months). Figures below the title are for MKE → SEA, its busiest leg

On time
78%
218 flights · likely 72–83%
Cancelled
0.5%
of scheduled flights
Typical arrival
−3 min
median vs schedule
When late
+39 min
average delay
Similar flights
75%
AS, same route & hour

About 1 in 5 AS 507 flights from Milwaukee arrived 15+ minutes late, diverted or cancelled over the past year (22%); 0.5% were cancelled. The typical flight landed 3 minutes early.

AS 507: MKE → SEA

Scheduled to leave Milwaukee at 2:59 p.m. local time. Over the past year it arrived on time 78% of the time (218 flights), better than other AS flights on the route at that hour (75%). Last seen in the data Aug 31, 2026.

Usually Alaska Airlines's last flight of the day from Milwaukee to Seattle (62% of days). Alaska Airlines's last MKE–SEA flight was cancelled 0.0% of the time, against 0.6% for its earlier ones. If it's cancelled, the next Alaska Airlines flight is usually around 6:02 a.m. the next morning.

Month by month

40%70%100%Dec 2025: too few flights (11 flights)DecJan 2026: 68% on time (19 flights)68JanFeb 2026: 78% on time (18 flights)78FebMar 2026: 62% on time (26 flights)62MarApr 2026: 100% on time (26 flights)100AprMay 2026: 81% on time (27 flights)81MayJun 2026: 77% on time (30 flights)77JunJul 2026: 80% on time (30 flights)80JulAug 2026: 84% on time (31 flights)84Aug

By day of week

DayFlightsOn time
Monday3773%
Tuesday2458%
Wednesday2584%
Thursday3577%
Friday3778%
Saturday2391%
Sunday3784%

Why it was late

Air traffic & airport (NAS) 33%Airline (crew, maintenance, ops) 26%Late inbound plane 20%Severe weather 18%Security 2%

All flights MKE → SEA · Connecting off AS 507? Check the risk

AS 507: SEA → MKE

Scheduled to leave Seattle at 8:06 a.m. local time. Over the past year it arrived on time 94% of the time (187 flights), in line with other AS flights on the route at that hour (92%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Dec 2025: too few flights (14 flights)DecJan 2026: too few flights (6 flights)JanMar 2026: too few flights (14 flights)MarApr 2026: 97% on time (30 flights)97AprMay 2026: 87% on time (31 flights)87MayJun 2026: 93% on time (30 flights)93JunJul 2026: 87% on time (31 flights)87JulAug 2026: 100% on time (31 flights)100Aug

By day of week

DayFlightsOn time
Monday27100%
Tuesday2688%
Wednesday26100%
Thursday2793%
Friday2793%
Saturday2793%
Sunday2789%

Why it was late

Air traffic & airport (NAS) 42%Airline (crew, maintenance, ops) 30%Late inbound plane 26%Security 2%

All flights SEA → MKE · Connecting off AS 507? Check the risk

Questions

How often is AS 507 from MKE to SEA late?

Alaska Airlines 507 from Milwaukee, WI to Seattle, WA arrived 15 or more minutes late, was diverted or was cancelled on 22% of 218 scheduled flights between September 2025 and August 2026. 0.5% were cancelled.

How often is AS 507 from SEA to MKE late?

Alaska Airlines 507 from Seattle, WA to Milwaukee, WI arrived 15 or more minutes late, was diverted or was cancelled on 6% of 187 scheduled flights between September 2025 and August 2026. 0.0% were cancelled.

Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Alaska Airlines for today's flight. Method.