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

Return flights

18 Sep - 22 Sep	Ryanair
25 Sep - 29 Sep	Ryanair
04 Sep - 09 Sep	Norwegian Air Sweden AOC
05 Sep - 30 Sep	Aer Lingus
22 Sep - 26 Sep	Ryanair
17 Sep - 01 Oct	Ryanair
12 Sep - 15 Sep	Ryanair
30 Sep - 05 Oct	Ryanair
29 Sep - 05 Oct	Vueling Airlines
13 Sep - 29 Sep	Ryanair
16 Sep - 01 Oct	Ryanair
19 Sep - 04 Oct	Ryanair
12 Sep - 19 Sep	Ryanair
11 Sep - 14 Sep	Vueling Airlines
27 Sep - 03 Oct	Ryanair
10 Sep - 13 Sep	Ryanair
29 Sep - 04 Oct	Vueling Airlines
19 Sep - 03 Oct	Ryanair
15 Sep - 03 Oct	Ryanair
14 Sep - 02 Oct	Ryanair

Also check the deals for one-way flights from Lisbon 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 Lisbon to Riga in September from 160€

Return flights