Alaska AirlinesAS
Flights AS516 varies daily
live
Direct flights from Seattle (SEA) to Fort Lauderdale (FLL): 14 nonstop departures observed each week across 2 airlines. The nonstop covers 4,368 km, an estimated 6 hours 6 minutes in the air. Measured by Pro Flight Search from live flight boards at Seattle and Fort Lauderdale. Updated 14 September 2026 at 16:22 UTC.
SEA
Seattle
busy · +21
FLL
Fort Lauderdale
smooth · +0
4,368 km · ~6h 06m est.
Running clean · 2 airlines · 14x weekly · nonstop
86 / 100
route health from live SEA and FLL delay boards
Flight time~6h 06mestimated from route distance
Weekly departures14x2 direct airlines on the leg
Who flies it
observed on the boards · 7 daysDelta Air LinesDL
Flights DL338 varies daily
Airports right now
live boardsWeather lens
Current conditions put the pressure at FLL: 39% odds of a 15+ minute delay and around +9 min expected when it bites, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →
next sweep in 120s
How the Seattle to Fort Lauderdale route actually runs
Pro Flight Search records official board updates for nonstop SEA to FLL 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 Fort Lauderdale (FLL) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/SEA-FLL
SEA to FLL questions
Is SEA–FLL running on time right now?
Smooth skies ahead. The departure side at SEA is the weaker end, route health score 86/100. The airports section above carries the live status and delay window at both ends.
How long is the flight from SEA to FLL?
Great-circle distance is 4,368 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 338–404 min gate-to-gate on this route.
How often does SEA–FLL fly?
2 carriers operate this route, around 14 flights a week between them. Compare carrier days and times in the airline list above.
What does the route health score measure?
A blend of departure-side delay at SEA and arrival-side delay at FLL, computed from rolling delay windows (refreshed every 40 minutes) with a daily-rollup fallback. Current MVFR, IFR, or LIFR endpoint weather caps the score when flight rules can limit throughput. Higher is healthier: 100 means operations are clean at both ends.
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