AirHint found the following cheapest return flights from Lisbon (LIS) to Riga (RIX) in October 2025 (see full year).

Return flights

04 Oct - 07 Oct	Ryanair
18 Oct - 28 Oct	Ryanair
04 Oct - 06 Oct	Ryanair
01 Oct - 06 Oct	Aer Lingus
01 Oct - 07 Oct	Aer Lingus
11 Oct - 14 Oct	Ryanair
04 Oct - 11 Oct	Ryanair
01 Oct - 08 Oct	Aer Lingus
10 Oct - 14 Oct	Ryanair
10 Oct - 13 Oct	Ryanair
08 Oct - 06 Nov	Ryanair
31 Oct - 07 Nov	Ryanair
28 Oct - 01 Nov	airBaltic	direct

Also check the deals for one-way flights from Lisbon to Riga in October.

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 Lisbon to Riga in October from $167

Return flights