AirHint found the following cheapest return flights from Riga (RIX) to Keflavik (KEF) in August 2025 (see full year).

Return flights

28 Aug - 01 Sep	Norwegian Air Sweden AOC
29 Aug - 06 Sep	Norwegian Air Sweden AOC
19 Aug - 20 Aug	Finnair
23 Aug - 26 Aug	Ryanair
20 Aug - 27 Aug	Finnair
22 Aug - 24 Aug	Finnair
22 Aug - 25 Aug	Finnair
20 Aug - 21 Aug	Finnair
29 Aug - 06 Sep	airBaltic	direct
24 Aug - 26 Aug	Finnair
27 Aug - 30 Aug	Finnair
27 Aug - 30 Aug	Icelandair	direct
18 Aug - 19 Aug	LOT

Also check the deals for one-way flights from Riga to Keflavik in August.

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 Riga to Keflavik in August from 267€

Return flights