About 1 in 3 AS 305 flights from Miami arrived 15+ minutes late, diverted or cancelled over the past year (34%); 1.4% were cancelled. The typical flight landed 1 minutes late.
AS 305: MIA → SEA
Scheduled to leave Miami at 6:20 p.m. local time. Over the past year it arrived on time 66% of the time (281 flights), worse than other AS flights on the route at that hour (70%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 41 | 61% |
| Tuesday | 39 | 74% |
| Wednesday | 39 | 72% |
| Thursday | 39 | 69% |
| Friday | 41 | 59% |
| Saturday | 41 | 71% |
| Sunday | 41 | 59% |
Why it was late
All flights MIA → SEA · Connecting off AS 305? Check the risk
AS 305: SEA → MIA
Scheduled to leave Seattle at 8:12 a.m. local time. Over the past year it arrived on time 79% of the time (264 flights), in line with other AS flights on the route at that hour (78%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 38 | 74% |
| Tuesday | 37 | 89% |
| Wednesday | 38 | 87% |
| Thursday | 37 | 84% |
| Friday | 38 | 68% |
| Saturday | 38 | 74% |
| Sunday | 38 | 76% |
Why it was late
All flights SEA → MIA · Connecting off AS 305? Check the risk
Questions
How often is AS 305 from MIA to SEA late?
Alaska Airlines 305 from Miami, FL to Seattle, WA arrived 15 or more minutes late, was diverted or was cancelled on 34% of 281 scheduled flights between September 2025 and August 2026. 1.4% were cancelled.
How often is AS 305 from SEA to MIA late?
Alaska Airlines 305 from Seattle, WA to Miami, FL arrived 15 or more minutes late, was diverted or was cancelled on 21% of 264 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.