Alaska AirlinesAS
Flights AS305 08:07 daily
live
Direct flights from Seattle (SEA) to Miami (MIA): 21 nonstop departures observed each week across 3 airlines. 73% of the last 11 tracked flights arrived within 15 minutes of schedule. The median arrival is 23 minutes early. 1 of the 11 tracked flights was cancelled. The nonstop covers 4,379 km, an estimated 6 hours 7 minutes in the air. Measured by Pro Flight Search from live flight boards at Seattle and Miami. Updated 15 November 2026 at 05:22 UTC.
Today, SEA → MIA
Sat 14 Nov · local times- 08:07 AS305Alaska Airlines Departed Landed 16:52 −15
- 08:10 DL506Delta Air Lines On scheduleGate B3 ·
- 21:14 AA2142American Airlines On scheduleGate D9 MIA 06:00scheduled
Checked SEA board 21:22 · MIA board 00:12
SEA
Seattle
disrupted · +63
MIA
Miami
disrupted · +62
4,379 km · ~6h 07m est.
Runs mixed · 3 airlines · 21x weekly · nonstop
73% on time
of the last 11 tracked SEA → MIA flights arrived within 15 minutes
Median arrival delay is −23 min. 1 of 11 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival−23 minacross the last 10 arrivals
Flight time~6h 07mestimated from route distance
Weekly departures21x3 direct airlines on the leg
Cancelled9.1%recent route rate · 1 of 11
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Alaska AirlinesAmerican AirlinesDelta Air Lines
Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.
Who flies it
observed on the boards · 7 daysHistory
operated legs · board outcomesActual board outcomes rather than schedules, paired departure and arrival per flight and day.
Full board history, day by day →
Airports right now
live boardsWeather lens
Conditions are tightest at SEA and MIA: a 31% chance of a 15+ minute delay. In this weather, the more delayed of the two airports is typically about +0 min. Both figures come from the two airports' delay records in similar weather. See live delays → · Weather risk by airport →
next sweep in 120s
How the Seattle to Miami route actually runs
Pro Flight Search records official board updates for nonstop SEA to MIA flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.
Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Cite this data
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Suggested citation
Pro Flight Search: Seattle (SEA) to Miami (MIA) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/SEA-MIA
SEA to MIA questions
Is SEA–MIA running on time right now?
High disruption likely. The departure side at SEA is the weaker end, route health score 17/100. The airports section above carries the live status and delay window at both ends.
Morning or evening flight on SEA–MIA?
Operators schedule morning departures around 08:07 and evening departures around 21:14 from SEA. Earlier flights typically land before destination-airport delays accumulate later in the day; check the MIA delay card to confirm conditions when you'd arrive.
How long is the flight from SEA to MIA?
Great-circle distance is 4,379 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 339–405 min gate-to-gate on this route.
How often does SEA–MIA fly?
3 carriers operate this route, around 21 flights a week between them. Compare carrier days and times in the airline list above.
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