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 July 2026, Icelandair operated the most departures, one of 2 carriers flying nonstop KEF–SEA; the Boeing 737 MAX 8 was the most common aircraft at 100% of departures; flights ran 85% full.
Departures
240
July 2026
Seats
38,450
both directions
Passengers
32,772
both directions
Load factor
85.2%
RPM ÷ ASM
Who flies KEF–SEA?
Icelandair operated the most nonstop KEF–SEA departures in July 2026 (178), one of 2 carriers on the route.
- FI
Icelandair
178 departures · 28,480 seats
Share of departures74.2%84.5%
Load
- AS
62 departures · 9,970 seats
Share of departures25.8%87.2%
Load
What plane flies KEF–SEA?
In July 2026, the Boeing 737 MAX 8 flew 100% of KEF–SEA departures.
- Boeing 737 MAX 8
240 departures · 85.2% load
100.0%
How has KEF–SEA traffic changed?
Nonstop KEF–SEA departures rose from 184 in August 2025 to 240 in July 2026.
Monthly nonstop KEF–SEA traffic, trailing 12 months through July 2026. Bars scale to the busiest month; months with no filed service show as zero.
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
June 2026
225 departures · 29,316 passengers
81.3%
Load
July 2026
240 departures · 32,772 passengers
85.2%
Load
By direction
Each direction is filed separately — they rarely match.
KEF → SEA
88.2% full
120 departures · 16,952 passengers
SEA → KEF
82.3% full
120 departures · 15,820 passengers
Nonstop KEF–SEA traffic has been filed since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through July 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 July 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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