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

Return flights

29 Sep - 10 Oct	Finnair
28 Sep - 08 Oct	Finnair
27 Sep - 10 Oct	Finnair
28 Sep - 13 Oct	Finnair
22 Sep - 08 Oct	Finnair
11 Sep - 15 Sep	KLM
25 Sep - 30 Sep	Finnair
11 Sep - 18 Sep	Finnair
30 Sep - 08 Oct	Finnair
10 Sep - 17 Sep	Air France
14 Sep - 20 Sep	British Airways
08 Sep - 16 Sep	Finnair
28 Sep - 06 Oct	Finnair
09 Sep - 23 Sep	Finnair
08 Sep - 15 Sep	Finnair
10 Sep - 27 Sep	Finnair
26 Sep - 30 Sep	Finnair
15 Sep - 11 Oct	Finnair
25 Sep - 05 Oct	Lufthansa
21 Sep - 17 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 $554

Return flights