Cheapest return flights from Seattle to Keflavik in October from 580€

Best time to book flights for Seattle (SEA) to Keflavik (KEF) flights at AirHint

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

Return flights

30 Oct - 06 Nov Alaska Airlines
29 Oct - 05 Nov Alaska Airlines
21 Oct - 28 Oct Alaska Airlines
21 Oct - 31 Oct Alaska Airlines
28 Oct - 07 Nov Alaska Airlines
20 Oct - 26 Oct jetBlue
12 Oct - 21 Oct Air France
18 Oct - 25 Oct Alaska Airlines
07 Oct - 17 Oct Alaska Airlines
14 Oct - 23 Oct jetBlue
14 Oct - 24 Oct jetBlue
06 Oct - 15 Oct jetBlue
26 Oct - 01 Nov jetBlue
29 Oct - 04 Nov Alaska Airlines
28 Oct - 03 Nov jetBlue
29 Oct - 08 Nov Alaska Airlines
28 Oct - 04 Nov jetBlue
27 Oct - 06 Nov Alaska Airlines
15 Oct - 25 Oct jetBlue
25 Oct - 04 Nov Alaska Airlines

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

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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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