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

Return flights

26 Sep - 28 Sep	airBaltic	direct
01 Sep - 15 Sep	airBaltic	direct
12 Sep - 12 Sep	airBaltic	direct
19 Sep - 25 Sep	airBaltic	direct
29 Sep - 08 Oct	airBaltic	direct
05 Sep - 11 Sep	airBaltic	direct
12 Sep - 15 Sep	airBaltic	direct
17 Sep - 20 Sep	airBaltic	direct
19 Sep - 22 Sep	airBaltic	direct
29 Sep - 05 Oct	airBaltic	direct
15 Sep - 22 Sep	Finnair	direct

Also check the deals for one-way flights from Helsinki 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 Helsinki to Riga in September from $89

Return flights