AirHint found the following cheapest return flights from Seattle (SEA) to Keflavik (KEF) in November 2025 (see full year).

Return flights

10 Nov - 17 Nov	Icelandair	direct
04 Nov - 11 Nov	Icelandair	direct
12 Nov - 19 Nov	Icelandair	direct
16 Nov - 23 Nov	Icelandair	direct
28 Nov - 05 Dec	Icelandair	direct
02 Nov - 09 Nov	Icelandair	direct
13 Nov - 20 Nov	Icelandair	direct
14 Nov - 21 Nov	Icelandair	direct
08 Nov - 15 Nov	Icelandair	direct
11 Nov - 18 Nov	Icelandair	direct
20 Nov - 04 Dec	Lufthansa
20 Nov - 27 Nov	Icelandair	direct
20 Nov - 04 Dec	Icelandair	direct

Also check the deals for one-way flights from Seattle to Keflavik in November.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Seattle to Keflavik in November from $370

Return flights