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

Return flights

03 Sep - 10 Sep	Virgin Atlantic
04 Sep - 11 Sep	Virgin Atlantic
12 Sep - 24 Sep	Spirit Airlines
07 Sep - 14 Sep	Spirit Airlines
25 Sep - 30 Sep	Frontier Airlines
14 Sep - 27 Sep	Frontier Airlines
01 Sep - 08 Sep	Frontier Airlines
28 Sep - 02 Oct	Spirit Airlines

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

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 September from 402€

Return flights