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

Return flights

26 Oct - 01 Nov	Icelandair	direct
26 Oct - 30 Oct	Icelandair	direct
31 Oct - 04 Nov	Icelandair	direct
04 Oct - 14 Oct	Frontier Airlines
04 Oct - 12 Oct	Spirit Airlines
13 Oct - 21 Oct	Frontier Airlines
11 Oct - 19 Oct	Spirit Airlines
04 Oct - 11 Oct	Frontier Airlines
05 Oct - 14 Oct	Frontier Airlines
29 Oct - 02 Nov	Spirit Airlines
09 Oct - 14 Oct	Spirit Airlines
01 Oct - 06 Oct	Frontier Airlines
06 Oct - 01 Nov	Air Canada

Also check the deals for one-way flights from Miami 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 Miami to Keflavik in October from $378

Return flights