Cheapest return flights from Miami to Keflavik in September from $454

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

Return flights

29 Sep - 06 Oct Frontier Airlines
30 Sep - 07 Oct Frontier Airlines
12 Sep - 24 Sep Frontier Airlines
28 Sep - 05 Oct Frontier Airlines
08 Sep - 15 Sep Frontier Airlines
21 Sep - 25 Sep Frontier Airlines
24 Sep - 01 Oct Spirit Airlines
18 Sep - 11 Oct Spirit Airlines
06 Sep - 13 Sep Frontier Airlines
20 Sep - 27 Sep Frontier Airlines
27 Sep - 04 Oct Frontier Airlines
25 Sep - 02 Oct Spirit Airlines
22 Sep - 29 Sep Spirit Airlines
17 Sep - 19 Sep Spirit Airlines
21 Sep - 28 Sep Frontier Airlines
23 Sep - 30 Sep Spirit Airlines
26 Sep - 03 Oct Frontier Airlines

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

Skyscanner

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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