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

Return flights

20 Sep - 11 Oct	Spirit Airlines
20 Sep - 23 Sep	Frontier Airlines
19 Sep - 23 Sep	Frontier Airlines
15 Sep - 11 Oct	Spirit Airlines
16 Sep - 23 Sep	Air France
15 Sep - 19 Sep	Air France
17 Sep - 01 Oct	Spirit Airlines
17 Sep - 26 Sep	Spirit Airlines
27 Sep - 04 Oct	Spirit Airlines
17 Sep - 19 Sep	Frontier Airlines
16 Sep - 25 Sep	Spirit Airlines
26 Sep - 28 Sep	Spirit Airlines
18 Sep - 21 Sep	Air Canada
25 Sep - 28 Sep	Delta
19 Sep - 03 Oct	Frontier Airlines
15 Sep - 11 Oct	Icelandair	direct

Also check the deals for one-way flights from Orlando 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 Orlando to Keflavik in September from 344€

Return flights