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

Return flights

24 Sep - 29 Sep	Vueling Airlines
24 Sep - 01 Oct	Vueling Airlines
23 Sep - 28 Sep	Vueling Airlines
25 Sep - 29 Sep	Ryanair
24 Sep - 27 Sep	Ryanair
18 Sep - 22 Sep	Ryanair
16 Sep - 28 Sep	Vueling Airlines
25 Sep - 28 Sep	Vueling Airlines
17 Sep - 22 Sep	Vueling Airlines
27 Sep - 30 Sep	Ryanair
18 Sep - 28 Sep	Ryanair
22 Sep - 08 Oct	Vueling Airlines
24 Sep - 01 Oct	Ryanair	direct
30 Sep - 01 Oct	easyJet
26 Sep - 01 Oct	Vueling Airlines
30 Sep - 04 Oct	easyJet
30 Sep - 05 Oct	easyJet
30 Sep - 07 Oct	easyJet
30 Sep - 06 Oct	easyJet
22 Sep - 08 Oct	Eurowings	direct

Also check the deals for one-way flights from Lisbon to Cologne 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 Cologne in September from $161

Return flights