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

Return flights

12 Sep - 13 Oct	Ryanair
15 Sep - 19 Oct	Wizz Air Malta
24 Sep - 29 Oct	Wizz Air Malta
24 Sep - 30 Oct	Wizz Air Malta
04 Sep - 17 Sep	SWISS
25 Sep - 25 Oct	Ryanair
03 Sep - 24 Oct	Lufthansa
17 Sep - 22 Oct	Lufthansa
19 Sep - 10 Oct	Lufthansa
19 Sep - 05 Oct	Lufthansa
24 Sep - 31 Oct	Wizz Air Malta
12 Sep - 28 Sep	SWISS
05 Sep - 18 Sep	Lufthansa
01 Sep - 15 Sep	TAP
01 Sep - 10 Sep	TAP
07 Sep - 12 Sep	SWISS

Also check the deals for one-way flights from Porto to Delhi 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 Porto to Delhi in September from $579

Return flights