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

Return flights

19 Aug - 26 Aug	Air Canada
21 Aug - 29 Aug	Frontier Airlines
21 Aug - 30 Aug	Spirit Airlines
21 Aug - 25 Aug	Spirit Airlines
01 Aug - 15 Aug	Air France
15 Aug - 18 Aug	Air Canada
29 Aug - 01 Sep	Frontier Airlines
01 Aug - 10 Aug	Norse Atlantic Airways (UK)

Also check the deals for one-way flights from Miami to Keflavik in August.

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 August from 504€

Return flights