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

Return flights

26 Sep - 30 Sep	easyJet
17 Sep - 22 Sep	easyJet
27 Sep - 06 Oct	easyJet
18 Sep - 22 Sep	easyJet
11 Sep - 15 Sep	easyJet
25 Sep - 05 Oct	easyJet
12 Sep - 15 Sep	easyJet
23 Sep - 30 Sep	easyJet
27 Sep - 05 Oct	easyJet
23 Sep - 06 Oct	easyJet
16 Sep - 30 Sep	easyJet
26 Sep - 28 Sep	easyJet
24 Sep - 27 Sep	easyJet
25 Sep - 28 Sep	easyJet
27 Sep - 04 Oct	easyJet
27 Sep - 11 Oct	easyJet
20 Sep - 04 Oct	easyJet

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 151€

Return flights