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

Return flights

28 Nov - 10 Dec	Icelandair	direct
29 Nov - 08 Dec	Icelandair	direct
20 Nov - 27 Nov	Icelandair	direct
21 Nov - 28 Nov	Icelandair	direct
23 Nov - 30 Nov	Icelandair	direct
22 Nov - 29 Nov	Lufthansa
22 Nov - 29 Nov	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 379€

Return flights