Reykjavík (KEF) to Seattle (SEA)
Flight time
≈ 8h 01m
Bearing
303° NW
Reykjavík (KEF) to Seattle (SEA) is 3,611 miles (5,811 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies KEF–SEA
Filed traffic dataIn May 2026, Alaska Airlines was the only carrier flying nonstop KEF–SEA; the Boeing 737 MAX 8 was the most common aircraft at 100% of departures; flights ran 57% full.
Departures
7
May 2026
Seats
1,127
both directions
Passengers
645
both directions
Load factor
57.2%
RPM ÷ ASM
Who flies KEF–SEA?
Alaska Airlines was the only carrier to fly nonstop KEF–SEA in May 2026 (7 departures).
- AS
7 departures · 1,127 seats
Share of departures100.0%57.2%
Load
What plane flies KEF–SEA?
In May 2026, the Boeing 737 MAX 8 flew 100% of KEF–SEA departures.
- Boeing 737 MAX 8
7 departures · 57.2% load
100.0%
How has KEF–SEA traffic changed?
Nonstop KEF–SEA departures fell from 181 in June 2025 to 7 in May 2026.
Monthly nonstop KEF–SEA traffic, trailing 12 months through May 2026. Bars scale to the busiest month; months with no filed service show as zero.
June 2025
181 departures · 26,443 passengers
78.6%
Load
July 2025
186 departures · 29,656 passengers
85.3%
Load
August 2025
184 departures · 28,765 passengers
83.6%
Load
September 2025
146 departures · 22,086 passengers
79.6%
Load
October 2025
106 departures · 15,567 passengers
78.2%
Load
November 2025
60 departures · 9,627 passengers
86.4%
Load
December 2025
62 departures · 10,212 passengers
86.6%
Load
January 2026
62 departures · 9,267 passengers
81.6%
Load
February 2026
56 departures · 8,483 passengers
81.4%
Load
March 2026
70 departures · 7,775 passengers
60.0%
Load
April 2026
116 departures · 15,461 passengers
74.1%
Load
May 2026
7 departures · 645 passengers
57.2%
Load
By direction
Each direction is filed separately — they rarely match.
SEA → KEF
77.6% full
4 departures · 500 passengers
KEF → SEA
30.0% full
3 departures · 145 passengers
Nonstop KEF–SEA traffic has been filed since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through May 2026; filings from 2025. Public domain (US Government work).
The airports
Reykjavík
IS
Keflavik International Airport
Coordinates
63.98°N, 22.61°W
Hemisphere
N · W
Frequently asked
How far is Reykjavík (KEF) from Seattle (SEA)?
KEF to SEA is 3,611 miles (5,811 km / 3,138 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from KEF to SEA?
A nonstop covers the 3,611-mile great-circle distance in roughly 8h 01m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies KEF–SEA?
In May 2026, the Boeing 737 MAX 8 flew the largest share of departures (100.0%).
What mileage do I earn flying KEF–SEA?
Distance-based programs credit off the 3,611-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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