ON TIMEBOARD
Alaska Airlines / SEA → CVG

AS 508 on time

Alaska Airlines 508: Seattle to Cincinnati at 8:39 a.m.; Cincinnati to Seattle at 5:07 p.m. (past 12 months). Figures below the title are for SEA → CVG, its busiest leg

On time
82%
348 flights · likely 78–86%
Cancelled
1.4%
of scheduled flights
Typical arrival
−10 min
median vs schedule
When late
+41 min
average delay
Similar flights
81%
AS, same route & hour

About 1 in 6 AS 508 flights from Seattle arrived 15+ minutes late, diverted or cancelled over the past year (18%); 1.4% were cancelled. The typical flight landed 10 minutes early.

AS 508: SEA → CVG

Scheduled to leave Seattle at 8:39 a.m. local time. Over the past year it arrived on time 82% of the time (348 flights), in line with other AS flights on the route at that hour (81%). Last seen in the data Aug 18, 2026.

Month by month

40%70%100%Sep 2025: 87% on time (30 flights)87SepOct 2025: 84% on time (31 flights)84OctNov 2025: 83% on time (29 flights)83NovDec 2025: 69% on time (29 flights)69DecJan 2026: 71% on time (31 flights)71JanFeb 2026: 89% on time (28 flights)89FebMar 2026: 80% on time (30 flights)80MarApr 2026: 80% on time (30 flights)80AprMay 2026: 84% on time (31 flights)84MayJun 2026: 83% on time (30 flights)83JunJul 2026: 94% on time (31 flights)94JulAug 2026: 78% on time (18 flights)78Aug

By day of week

DayFlightsOn time
Monday5178%
Tuesday5088%
Wednesday5088%
Thursday4984%
Friday5082%
Saturday4885%
Sunday5068%

Why it was late

Airline (crew, maintenance, ops) 48%Late inbound plane 27%Air traffic & airport (NAS) 26%

All flights SEA → CVG · Connecting off AS 508? Check the risk

AS 508: CVG → SEA

Scheduled to leave Cincinnati at 5:07 p.m. local time. Over the past year it arrived on time 71% of the time (278 flights), in line with other AS flights on the route at that hour (69%). Last seen in the data Aug 18, 2026.

Month by month

20%60%100%Aug 2025: 68% on time (31 flights)68AugSep 2025: 90% on time (30 flights)90SepOct 2025: 74% on time (31 flights)74OctNov 2025: 69% on time (29 flights)69NovDec 2025: 31% on time (29 flights)31DecJan 2026: too few flights (6 flights)JanMar 2026: too few flights (14 flights)MarApr 2026: 70% on time (30 flights)70AprMay 2026: 81% on time (31 flights)81MayJun 2026: 77% on time (30 flights)77JunJul 2026: 87% on time (30 flights)87JulAug 2026: 67% on time (18 flights)67Aug

By day of week

DayFlightsOn time
Monday4159%
Tuesday4178%
Wednesday4080%
Thursday3967%
Friday4065%
Saturday3778%
Sunday4068%

Why it was late

Late inbound plane 41%Air traffic & airport (NAS) 29%Airline (crew, maintenance, ops) 27%Severe weather 3%

All flights CVG → SEA · Connecting off AS 508? Check the risk

Questions

How often is AS 508 from SEA to CVG late?

Alaska Airlines 508 from Seattle, WA to Cincinnati, OH arrived 15 or more minutes late, was diverted or was cancelled on 18% of 348 scheduled flights between September 2025 and August 2026. 1.4% were cancelled.

How often is AS 508 from CVG to SEA late?

Alaska Airlines 508 from Cincinnati, OH to Seattle, WA arrived 15 or more minutes late, was diverted or was cancelled on 30% of 278 scheduled flights between September 2025 and August 2026. 1.1% 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.