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

Return flights

26 Oct - 11 Nov	Icelandair
29 Oct - 11 Nov	Icelandair
12 Oct - 23 Oct	Aer Lingus
29 Oct - 22 Nov	Air Canada
30 Oct - 22 Nov	Air Canada
30 Oct - 08 Nov	Air Canada
19 Oct - 08 Nov	Air Canada
22 Oct - 15 Nov	Air Canada
20 Oct - 15 Nov	Air Canada
26 Oct - 15 Nov	Air Canada
31 Oct - 22 Nov	Lufthansa
11 Oct - 21 Oct	Air Canada
04 Oct - 25 Oct	Air Canada
03 Oct - 25 Oct	Aer Lingus
02 Oct - 25 Oct	Lufthansa
13 Oct - 24 Oct	United
06 Oct - 17 Oct	United
04 Oct - 18 Oct	Air Canada
01 Oct - 25 Oct	Air Canada
03 Oct - 06 Oct	Air Canada

Also check the deals for one-way flights from Denver to Barcelona in October.

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 October from $400

Return flights