KEF → SEAReykjavík to Seattle

live

Direct flights from Reykjavík (KEF) to Seattle (SEA): 14 nonstop departures observed each week across 2 airlines. 75% of the last 8 operated flights arrived within 15 minutes of schedule. The median arrival is 5 minutes late. No cancellations were recorded across the 8 tracked flights. The nonstop covers 5,811 km, an estimated 7 hours 57 minutes in the air. Measured by Pro Flight Search from live flight boards at Reykjavík and Seattle. Updated 13 September 2026 at 18:22 UTC.

KEF Reykjavík smooth · +9
SEA Seattle smooth · +0
5,811 km · ~7h 57m est.
dep bank 10:40–19:4514x weekly
Runs mixed · 2 airlines · 14x weekly · nonstop
75% on time

of the last 8 operated KEF → SEA flights arrived within 15 minutes

Median arrival delay is +5 min. 0 of 8 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →

Median arrival+5 minacross the last 8 operated legs
Flight time~7h 57mestimated from route distance
Weekly departures14x2 direct airlines on the leg

The week

scheduled departures · origin local time
06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Alaska AirlinesIcelandair

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 days
Alaska AirlinesAS

Flights AS355 12:45 daily

IcelandairFI75% on time

Flights FI685 10:40 daily · FI681 16:50 daily · FI683 19:45 Mo Tu We Th Fr Sa

History

operated legs · board outcomes
09-13FI681dep +29 → arr+17
09-13FI685dep +22 → arr−1
09-12FI681departed+5
09-12FI683departed+5
09-12FI685departed+4
09-11FI681departed+3
09-11FI683departed+18
09-11FI685departed−7

Actual board outcomes rather than schedules, paired departure and arrival per flight and day.

Full board history, day by day →

Airports right now

live boards
KEFReykjavík +9 min smooth 🌤 mostly cloudy · E 24 kt Full KEF delay board →
SEASeattle +0 min smooth 🌫 overcast · S 9 kt Full SEA delay board →

Weather lens

Current conditions put the pressure at KEF: 30% odds of a 15+ minute delay and around +6 min expected when it bites, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →

How the Reykjavík to Seattle route actually runs

Pro Flight Search records official board updates for nonstop KEF 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 — Reykjavík (KEF) to Seattle (SEA) route reliability, measured from operated flights on official airport boards.

Canonical URL
https://proflightsearch.com/search-flights/KEF-SEA
How we measure this →

KEF to SEA questions

Is KEF–SEA running on time right now?

Smooth skies ahead. The departure side at KEF is the weaker end, route health score 93/100. The airports section above carries the live status and delay window at both ends.

Morning or evening flight on KEF–SEA?

Operators schedule morning departures around 10:40 and evening departures around 19:45 from KEF. 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 KEF to SEA?

Great-circle distance is 5,811 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 440–528 min gate-to-gate on this route.

How often does KEF–SEA fly?

2 carriers operate this route, around 27 flights a week between them. Compare carrier days and times in the airline list above.