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

Return flights

16 Sep - 23 Sep	Pegasus Airlines
25 Sep - 30 Sep	easyJet
18 Sep - 29 Sep	easyJet
30 Sep - 07 Oct	easyJet
30 Sep - 14 Oct	Ryanair
29 Sep - 06 Oct	TAP
29 Sep - 04 Oct	TAP
24 Sep - 03 Oct	easyJet
30 Sep - 08 Oct	Ryanair
23 Sep - 06 Oct	easyJet
11 Sep - 16 Sep	easyJet
16 Sep - 22 Sep	easyJet
17 Sep - 18 Sep	Ryanair
24 Sep - 27 Sep	easyJet
22 Sep - 06 Oct	Vueling Airlines
12 Sep - 16 Sep	easyJet
17 Sep - 23 Sep	Pegasus Airlines
25 Sep - 27 Sep	easyJet
20 Sep - 07 Oct	easyJet
16 Sep - 16 Oct	Pegasus Airlines

Also check the deals for one-way flights from Lisbon to Istanbul 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 Lisbon to Istanbul in September from 172€

Return flights