AirHint found the following cheapest return flights from Rio De Janeiro (GIG) to Keflavik (KEF) in September 2025 (see full year).

Return flights

17 Sep - 25 Sep	Copa
19 Sep - 25 Sep	Copa
17 Sep - 27 Sep	Copa
20 Sep - 25 Sep	Copa
17 Sep - 24 Sep	Copa
19 Sep - 24 Sep	Copa
17 Sep - 26 Sep	Copa
20 Sep - 27 Sep	Copa
20 Sep - 24 Sep	Copa
18 Sep - 26 Sep	Avianca
30 Sep - 10 Oct	Iberia
28 Sep - 09 Oct	TAP

Also check the deals for one-way flights from Rio De Janeiro 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 Rio De Janeiro to Keflavik in September from 766€

Return flights