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

Return flights

27 Sep - 11 Oct	Finnair
20 Sep - 07 Oct	Finnair
22 Sep - 01 Oct	Finnair
21 Sep - 01 Oct	Finnair
24 Sep - 01 Oct	Finnair
20 Sep - 30 Sep	Finnair
16 Sep - 22 Sep	Finnair
16 Sep - 25 Sep	Finnair
18 Sep - 23 Sep	British Airways
17 Sep - 22 Sep	Finnair
09 Sep - 16 Sep	Finnair
23 Sep - 30 Sep	Finnair
16 Sep - 30 Sep	Finnair
14 Sep - 20 Sep	British Airways
21 Sep - 29 Sep	Finnair
20 Sep - 04 Oct	Finnair
30 Sep - 21 Oct	Finnair
26 Sep - 04 Oct	Finnair
28 Sep - 05 Oct	Finnair
15 Sep - 11 Oct	Finnair

Also check the deals for one-way flights from Delhi 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 Delhi to Lisbon in September from 480€

Return flights