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

Return flights

08 Jul - 15 Jul	Frontier Airlines
12 Jul - 20 Jul	Frontier Airlines
30 Jul - 04 Aug	jetBlue
16 Jul - 23 Jul	jetBlue
23 Jul - 29 Jul	Frontier Airlines
24 Jul - 01 Aug	Spirit Airlines
11 Jul - 19 Jul	Spirit Airlines
18 Jul - 23 Jul	Frontier Airlines
22 Jul - 30 Jul	Frontier Airlines
31 Jul - 08 Aug	Spirit Airlines
10 Jul - 16 Jul	Spirit Airlines
19 Jul - 27 Jul	Spirit Airlines
04 Jul - 12 Jul	Spirit Airlines
28 Jul - 02 Aug	Spirit Airlines
27 Jul - 01 Aug	Spirit Airlines

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

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 July from $462

Return flights