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

Return flights

21 Sep - 01 Oct	Spirit Airlines
10 Sep - 21 Sep	jetBlue
14 Sep - 21 Sep	Spirit Airlines
09 Sep - 14 Sep	jetBlue
10 Sep - 14 Sep	jetBlue
19 Sep - 27 Sep	Spirit Airlines
16 Sep - 25 Sep	jetBlue
16 Sep - 21 Sep	jetBlue
30 Sep - 05 Oct	jetBlue
30 Sep - 06 Oct	FrenchBee
23 Sep - 28 Sep	jetBlue
03 Sep - 10 Sep	jetBlue
12 Sep - 21 Sep	jetBlue
29 Sep - 05 Oct	jetBlue
30 Sep - 09 Oct	jetBlue
30 Sep - 07 Oct	Air France
27 Sep - 02 Oct	jetBlue
20 Sep - 01 Oct	British Airways
24 Sep - 01 Oct	British Airways
27 Sep - 06 Oct	Air Canada

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 $507

Return flights