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

Return flights

28 Sep - 15 Oct	TAP	direct
29 Sep - 08 Oct	TAP	direct
28 Sep - 23 Oct	TAP	direct
28 Sep - 09 Oct	TAP	direct
30 Sep - 15 Oct	Vueling Airlines
29 Sep - 01 Oct	TAP	direct
29 Sep - 10 Oct	TAP	direct
28 Sep - 01 Oct	TAP	direct
28 Sep - 07 Oct	TAP
29 Sep - 07 Oct	TAP	direct
28 Sep - 30 Sep	TAP	direct
29 Sep - 30 Sep	TAP	direct
27 Sep - 30 Sep	TAP	direct
30 Sep - 30 Sep	TAP	direct
24 Sep - 30 Sep	Air France
28 Sep - 29 Sep	TAP
29 Sep - 29 Sep	TAP
23 Sep - 30 Sep	TAP	direct
26 Sep - 30 Sep	Brussels Airlines
23 Sep - 29 Sep	Vueling Airlines

Also check the deals for one-way flights from London 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 London to Lisbon in September from 159€

Return flights