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

Return flights

21 Sep - 09 Oct	TAP	direct
21 Sep - 30 Sep	TAP	direct
24 Sep - 09 Oct	TAP	direct
30 Sep - 13 Oct	LATAM Airlines Group
22 Sep - 14 Oct	Copa
23 Sep - 14 Oct	Copa
25 Sep - 02 Oct	TAP	direct
24 Sep - 30 Sep	TAP	direct
25 Sep - 09 Oct	TAP	direct
28 Sep - 06 Oct	GOL Linhas Aéreas
21 Sep - 27 Sep	TAP	direct
26 Sep - 03 Oct	LATAM Airlines Group
17 Sep - 02 Oct	TAP	direct
18 Sep - 23 Sep	TAP	direct
23 Sep - 30 Sep	Copa
21 Sep - 25 Sep	TAP	direct
26 Sep - 29 Sep	LATAM Airlines Group
20 Sep - 30 Sep	Copa
17 Sep - 19 Sep	TAP
18 Sep - 30 Sep	TAP	direct

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 745€

Return flights