AirHint found the following cheapest return flights from Dublin (DUB) to Cologne (CGN) in August 2025 (see full year).

Return flights

31 Aug - 03 Sep	Ryanair
31 Aug - 03 Sep	Ryanair	direct
31 Aug - 10 Sep	Ryanair	direct
31 Aug - 17 Sep	Ryanair	direct
31 Aug - 12 Sep	Ryanair	direct
31 Aug - 14 Sep	Ryanair	direct
29 Aug - 03 Sep	Aer Lingus
30 Aug - 03 Sep	Aer Lingus
31 Aug - 19 Sep	Ryanair	direct
31 Aug - 21 Sep	Ryanair	direct
30 Aug - 31 Aug	Aer Lingus
29 Aug - 31 Aug	Ryanair
29 Aug - 30 Aug	Aer Lingus
29 Aug - 31 Aug	Ryanair	direct

Also check the deals for one-way flights from Dublin to Cologne in August.

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 Dublin to Cologne in August from $147

Return flights