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

Return flights

29 Sep - 09 Oct	LATAM Airlines Group
24 Sep - 30 Sep	LATAM Airlines Group
28 Sep - 07 Oct	Azul Airlines
30 Sep - 13 Oct	LATAM Airlines Group
21 Sep - 27 Sep	TAP	direct
25 Sep - 07 Oct	LATAM Airlines Group
26 Sep - 04 Oct	Azul Airlines
23 Sep - 24 Oct	Lufthansa
22 Sep - 06 Oct	Copa
25 Sep - 09 Oct	Azul Airlines
18 Sep - 02 Oct	TAP	direct
17 Sep - 02 Oct	TAP	direct
15 Sep - 23 Sep	Copa
27 Sep - 29 Sep	Copa
18 Sep - 25 Sep	TAP	direct
23 Sep - 30 Sep	Copa
21 Sep - 25 Sep	TAP	direct
20 Sep - 30 Sep	Copa
20 Sep - 27 Sep	Copa
16 Sep - 23 Sep	LATAM Airlines Group

Also check the deals for one-way flights from Porto Alegre to Lisbon 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 Porto Alegre to Lisbon in September from $958

Return flights