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

Return flights

11 Sep - 18 Sep	Spirit Airlines
08 Sep - 13 Sep	Spirit Airlines
27 Sep - 06 Oct	Spirit Airlines
20 Sep - 28 Sep	jetBlue
26 Sep - 05 Oct	Spirit Airlines
22 Sep - 28 Sep	Spirit Airlines
01 Sep - 12 Sep	Frontier Airlines
27 Sep - 08 Oct	Spirit Airlines
25 Sep - 03 Oct	jetBlue
26 Sep - 07 Oct	jetBlue
05 Sep - 16 Sep	jetBlue
11 Sep - 18 Sep	Icelandair	direct
27 Sep - 06 Oct	Icelandair	direct
04 Sep - 14 Oct	Delta
04 Sep - 15 Sep	KLM
04 Sep - 11 Sep	Icelandair	direct
23 Sep - 01 Oct	Spirit Airlines
20 Sep - 28 Sep	Icelandair	direct
27 Sep - 08 Oct	Icelandair	direct
19 Sep - 03 Oct	Air Canada

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 $405

Return flights