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

Return flights

27 Sep - 01 Oct	Wizz Air
25 Sep - 28 Sep	Wizz Air
26 Sep - 08 Oct	Finnair
28 Sep - 06 Oct	Wizz Air
28 Sep - 04 Oct	Wizz Air
25 Sep - 29 Sep	Wizz Air
28 Sep - 05 Oct	Wizz Air
29 Sep - 06 Oct	Fly Play
27 Sep - 05 Oct	Wizz Air
21 Sep - 28 Sep	Fly Play
26 Sep - 29 Sep	Finnair
29 Sep - 03 Oct	Fly Play
29 Sep - 05 Oct	Fly Play
29 Sep - 04 Oct	Fly Play
18 Sep - 19 Sep	Wizz Air
25 Sep - 28 Sep	Icelandair	direct
18 Sep - 19 Sep	Icelandair	direct

Also check the deals for one-way flights from Keflavik to Riga 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 Keflavik to Riga in September from 228€

Return flights