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

Return flights

30 Sep - 06 Oct	Vueling Airlines
25 Sep - 02 Oct	Vueling Airlines
11 Sep - 30 Sep	Ryanair
25 Sep - 30 Sep	Vueling Airlines
24 Sep - 29 Sep	Vueling Airlines
25 Sep - 28 Sep	Vueling Airlines
30 Sep - 05 Oct	Vueling Airlines
17 Sep - 22 Sep	Ryanair
17 Sep - 24 Sep	Ryanair
18 Sep - 21 Sep	Ryanair
30 Sep - 04 Oct	Vueling Airlines
10 Sep - 24 Sep	Ryanair	direct
03 Sep - 24 Sep	Ryanair	direct
03 Sep - 09 Sep	Ryanair
26 Sep - 01 Oct	Ryanair
10 Sep - 01 Oct	Ryanair	direct
27 Sep - 01 Oct	Ryanair
17 Sep - 04 Oct	Ryanair	direct
17 Sep - 01 Oct	Ryanair	direct
24 Sep - 04 Oct	Ryanair	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 129€

Return flights