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

Return flights

19 Sep - 29 Sep	TAP	direct
19 Sep - 26 Sep	TAP	direct
21 Sep - 24 Sep	TAP	direct
30 Sep - 07 Oct	TAP	direct
23 Sep - 28 Sep	TAP	direct
17 Sep - 21 Sep	TAP	direct
19 Sep - 22 Sep	TAP	direct
17 Sep - 24 Sep	TAP	direct
24 Sep - 26 Sep	British Airways	direct
15 Sep - 22 Sep	TAP	direct
02 Sep - 09 Sep	British Airways	direct
30 Sep - 23 Oct	TAP

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 164€

Return flights