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

Return flights

17 Sep - 27 Sep	TAP	direct
25 Sep - 02 Oct	TAP	direct
19 Sep - 29 Sep	Azul Airlines
14 Sep - 27 Sep	TAP	direct
24 Sep - 30 Sep	TAP	direct
24 Sep - 04 Oct	TAP	direct
14 Sep - 11 Oct	TAP	direct
24 Sep - 11 Oct	TAP	direct
24 Sep - 09 Oct	TAP	direct
21 Sep - 09 Oct	TAP	direct
28 Sep - 09 Oct	TAP	direct
18 Sep - 27 Sep	TAP	direct
21 Sep - 30 Sep	TAP	direct
18 Sep - 09 Oct	TAP	direct
18 Sep - 07 Oct	TAP	direct
21 Sep - 02 Oct	TAP	direct
09 Sep - 18 Sep	LATAM Airlines Group
20 Sep - 30 Sep	Azul Airlines
12 Sep - 23 Sep	LATAM Airlines Group
13 Sep - 28 Sep	Azul Airlines

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.

Book a cheap hotel in Lisbon

Cheap car rent in Lisbon

Cheapest return flights from Porto Alegre to Lisbon in September from $703

Return flights