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Flights between Reykjavík (KEF) and Seattle (SEA)

Keflavik International Airport, Iceland ↔ Seattle–Tacoma International Airport, United States

A direct route between Reykjavík and Seattle appears in the OpenFlights route network.

Airlines currently operating this route:

Observed from recent schedules · as of 2 Aug 2026 — sampled, not a live timetable; confirm with the airline.

Alaska Airlines (AS)Icelandair (FI)
Distance
5,811 km
3,611 miles
Est. flight time
7h 46m
great-circle estimate
Time difference
~8h
varies with DST
View this route on the live map →Search fares on Skyscanner ↗

Climate

Typical monthly temperatures in Iceland

Jan
3°
8/-2
80mm
Feb
3°
8/-2
70mm
Mar
4°
9/-1
80mm
Apr
6°
11/1
60mm
May
9°
14/4
50mm
Jun
13°
18/8
50mm
Jul
14°
19/9
55mm
Aug
14°
19/9
65mm
Sep
11°
16/6
80mm
Oct
7°
12/2
90mm
Nov
4°
9/-1
80mm
Dec
3°
8/-2
90mm

Mean °C (high/low below), avg. rainfall mm · country-level monthly normals, not airport-specific.

Typical monthly temperatures in United States

Jan
4°
9/-1
70mm
Feb
6°
11/1
60mm
Mar
11°
16/6
75mm
Apr
17°
22/12
80mm
May
23°
28/18
95mm
Jun
28°
33/23
100mm
Jul
30°
35/25
95mm
Aug
29°
34/24
90mm
Sep
25°
30/20
80mm
Oct
18°
23/13
70mm
Nov
11°
16/6
70mm
Dec
5°
10/0
75mm

Mean °C (high/low below), avg. rainfall mm · country-level monthly normals, not airport-specific.

Travel advisories

Iceland: Normal precautions (UK FCDO) ↗United States: Normal precautions (UK FCDO) ↗

Common questions

How far is Reykjavík from Seattle?

Reykjavík (KEF) and Seattle (SEA) are around 5,811 km (3,611 miles) apart — an estimated 7h 46m by air. Distances and flight times are great-circle estimates.

Which airlines have operated the KEF–SEA route?

Airlines recorded operating this route in the OpenFlights network include Alaska Airlines, Icelandair. This reflects historical scheduled service and may be out of date.

What is the time difference between Reykjavík and Seattle?

Time difference ~ 8 hours (varies with daylight-saving).

When is it warmest in United States?

Across United States, the warmest month on average is July, with mean temperatures around 30°C. These are country-level monthly climate normals, not airport-specific.

Are there travel advisories for Iceland and United States?

The UK FCDO currently rates Iceland as Normal precautions; The UK FCDO rates United States as Normal precautions. Check the official sources before you travel.

Distances and flight times are great-circle estimates, not booked block times.