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

Return flights

16 Sep - 23 Sep	Norwegian Air Sweden AOC
09 Sep - 30 Sep	Norwegian Air Sweden AOC
26 Sep - 30 Sep	airBaltic
26 Sep - 04 Oct	airBaltic
05 Sep - 13 Sep	airBaltic	direct
25 Sep - 29 Sep	Lufthansa
01 Sep - 13 Sep	airBaltic	direct
01 Sep - 13 Sep	Ryanair
26 Sep - 30 Sep	airBaltic	direct
01 Sep - 30 Sep	airBaltic	direct
26 Sep - 04 Oct	airBaltic	direct

Also check the deals for one-way flights from Riga to Thessaloniki 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 Riga to Thessaloniki in September from $185

Return flights