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

Return flights

03 Dec - 12 Dec	Icelandair
07 Dec - 14 Dec	Icelandair
03 Dec - 10 Dec	British Airways
08 Dec - 15 Dec	Air Canada
01 Dec - 08 Dec	Iberia
02 Dec - 09 Dec	British Airways
09 Dec - 16 Dec	British Airways
11 Dec - 18 Dec	Lufthansa
10 Dec - 17 Dec	Air Canada
03 Dec - 05 Dec	Delta
23 Dec - 17 Jan	Virgin Atlantic
24 Dec - 10 Jan	Lufthansa
31 Dec - 07 Jan	Lufthansa
30 Dec - 06 Jan	Lufthansa
09 Dec - 06 Jan	United
27 Dec - 06 Jan	Air Canada
29 Dec - 05 Jan	Air Canada
26 Dec - 02 Jan	Turkish Airlines
25 Dec - 01 Jan	Turkish Airlines
28 Dec - 04 Jan	British Airways

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.

Book a cheap hotel in Barcelona

Cheap car rent in Barcelona

Cheapest return flights from Denver to Barcelona in December from $372

Return flights