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

Return flights

10 Dec - 17 Dec	Air Canada
09 Dec - 16 Dec	Air Canada
30 Dec - 13 Jan	British Airways
08 Dec - 15 Dec	Air Canada
10 Dec - 16 Dec	Delta
11 Dec - 18 Dec	Lufthansa
04 Dec - 07 Dec	Lufthansa
29 Dec - 12 Jan	Lufthansa
02 Dec - 09 Dec	Lufthansa
03 Dec - 10 Dec	Lufthansa
16 Dec - 23 Dec	Virgin Atlantic
14 Dec - 21 Dec	Virgin Atlantic
28 Dec - 11 Jan	British Airways
31 Dec - 07 Jan	Air Canada
30 Dec - 06 Jan	Air Canada
15 Dec - 07 Jan	Frontier Airlines
15 Dec - 06 Jan	Frontier Airlines
09 Dec - 06 Jan	United
24 Dec - 10 Jan	British Airways
29 Dec - 05 Jan	Air Canada

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

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 December from 340€

Return flights