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

Return flights

11 Sep - 17 Sep	Wizz Air
11 Sep - 16 Sep	Wizz Air
25 Sep - 10 Oct	Wizz Air
13 Sep - 17 Sep	Wizz Air
20 Sep - 24 Sep	Fly Play
15 Sep - 17 Sep	easyJet
25 Sep - 10 Oct	airBaltic	direct
13 Sep - 20 Sep	Fly Play
11 Sep - 14 Sep	Wizz Air
29 Sep - 05 Oct	Fly Play
16 Sep - 18 Sep	Wizz Air
10 Sep - 14 Sep	Wizz Air
12 Sep - 16 Sep	Finnair
27 Sep - 03 Oct	easyJet
28 Sep - 05 Oct	Fly Play
27 Sep - 03 Oct	airBaltic	direct
29 Sep - 05 Oct	airBaltic	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 $264

Return flights