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

Return flights

25 Sep - 29 Sep	easyJet
17 Sep - 22 Sep	easyJet
30 Sep - 06 Oct	easyJet
22 Sep - 29 Sep	Wizz Air
18 Sep - 22 Sep	easyJet
29 Sep - 05 Oct	TAP
30 Sep - 07 Oct	easyJet
30 Sep - 08 Oct	Ryanair
17 Sep - 23 Sep	easyJet
17 Sep - 27 Sep	easyJet
26 Sep - 29 Sep	easyJet
23 Sep - 06 Oct	easyJet
24 Sep - 01 Oct	easyJet
22 Sep - 25 Sep	Wizz Air
09 Sep - 16 Sep	Pegasus Airlines
20 Sep - 15 Oct	Pegasus Airlines
29 Sep - 04 Oct	Ryanair
24 Sep - 27 Sep	easyJet
30 Sep - 04 Oct	Ryanair
29 Sep - 10 Oct	Ryanair

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 $201

Return flights