AirHint found the following cheapest return flights from Denver (DEN) to Barcelona (BCN) in August 2025 (see full year).

Return flights

12 Aug - 22 Aug	Icelandair
23 Aug - 06 Sep	Aer Lingus
15 Aug - 22 Aug	Iberia
24 Aug - 28 Aug	Aer Lingus
20 Aug - 03 Sep	Icelandair
01 Aug - 15 Aug	Icelandair
23 Aug - 30 Aug	Icelandair
30 Aug - 06 Sep	Frontier Airlines
29 Aug - 09 Sep	Icelandair
07 Aug - 14 Aug	United
27 Aug - 03 Sep	United
08 Aug - 11 Aug	Air France
25 Aug - 01 Sep	United

Also check the deals for one-way flights from Denver to Barcelona 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 Denver to Barcelona in August from 408€

Return flights