Alaska AirlinesAS
Flights AS305 18:18 daily
live
Direct flights from Miami (MIA) to Seattle (SEA): 31 nonstop departures observed each week across 3 airlines. 1 of the 10 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 Miami and Seattle. Updated 5 November 2026 at 20:38 UTC.
Today, MIA → SEA
Thu 5 Nov · local times- 18:10 AS305Alaska On scheduleGate E6 · TE SEA est. 21:53sched 21:54
- 18:15 DL368Delta Air Lines On scheduleGate H3 · TH SEA est. 21:40sched 22:00
- 20:14 AA2363American On scheduleGate D45 · TD SEA 23:59scheduled
Checked MIA board 15:38 · SEA board 12:09
MIA
Miami
busy · +16
SEA
Seattle
smooth · +0
4,379 km · ~6h 07m est.
Running clean · 3 airlines · 31x weekly · nonstop
89 / 100
route health from live MIA and SEA delay boards
1 of 10 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Flight time~6h 07mestimated from route distance
Weekly departures31x3 direct airlines on the leg
Cancelled10.0%recent route rate · 1 of 10
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 MIA and SEA: 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 Miami to Seattle route actually runs
Pro Flight Search records official board updates for nonstop MIA to SEA 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: Miami (MIA) to Seattle (SEA) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/MIA-SEA
MIA to SEA questions
Is MIA–SEA running on time right now?
Smooth skies ahead. The departure side at MIA is the weaker end, route health score 89/100. The airports section above carries the live status and delay window at both ends.
Morning or evening flight on MIA–SEA?
Operators schedule evening departures around 18:15 from MIA. Earlier flights typically land before destination-airport delays accumulate later in the day; check the SEA delay card to confirm conditions when you'd arrive.
How long is the flight from MIA to SEA?
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 MIA–SEA fly?
3 carriers operate this route, around 31 flights a week between them. Compare carrier days and times in the airline list above.
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