AirHint found the following cheapest return flights from Athens (ATH) to Lisbon (LIS) in September 2026 (see full year).

Return flights

26 Sep - 30 Sep	TAP	direct
10 Sep - 17 Sep	Air Serbia
12 Sep - 16 Sep	TAP	direct
17 Sep - 22 Sep	Air Serbia
26 Sep - 03 Oct	TAP	direct
24 Sep - 30 Sep	Air Serbia
26 Sep - 29 Sep	TAP
18 Sep - 20 Sep	Air Serbia
18 Sep - 20 Sep	TAP	direct
25 Sep - 29 Sep	Air Serbia
19 Sep - 28 Sep	Air Serbia
28 Sep - 06 Oct	Air Serbia
16 Sep - 04 Oct	Vueling Airlines
28 Sep - 01 Oct	Air Serbia
28 Sep - 04 Oct	TAP	direct
28 Sep - 01 Oct	TAP	direct
16 Sep - 01 Oct	Vueling Airlines
16 Sep - 06 Oct	Vueling Airlines
16 Sep - 03 Oct	Vueling Airlines
29 Sep - 11 Oct	Volotea	direct

Also check the deals for one-way flights from Athens 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 Athens to Lisbon in September from 148€

Return flights