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

Return flights

14 Oct - 22 Oct	Icelandair	direct
15 Oct - 21 Oct	Icelandair	direct
08 Oct - 17 Oct	Icelandair	direct
07 Oct - 15 Oct	Icelandair	direct
22 Oct - 27 Oct	Icelandair	direct
19 Oct - 23 Oct	Icelandair	direct
04 Oct - 11 Oct	Icelandair	direct
15 Oct - 22 Oct	Icelandair	direct
01 Oct - 05 Oct	Icelandair	direct
08 Oct - 14 Oct	Icelandair	direct
25 Oct - 01 Nov	Icelandair	direct
26 Oct - 02 Nov	Icelandair	direct
27 Oct - 03 Nov	Icelandair	direct

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

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 Washington to Keflavik in October from $299

Return flights