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

Return flights

07 Dec - 14 Dec	Icelandair
07 Dec - 12 Dec	Icelandair
11 Dec - 14 Dec	TAP
02 Dec - 10 Dec	TAP
09 Dec - 16 Dec	TAP
01 Dec - 09 Dec	TAP
01 Dec - 09 Dec	Lufthansa	direct
09 Dec - 16 Dec	Lufthansa	direct
02 Dec - 10 Dec	Lufthansa	direct
05 Dec - 12 Dec	Icelandair
12 Dec - 10 Jan	Lufthansa
12 Dec - 09 Jan	Lufthansa
13 Dec - 11 Jan	Frontier Airlines
13 Dec - 10 Jan	Frontier Airlines
15 Dec - 11 Jan	Icelandair
15 Dec - 08 Jan	Icelandair
27 Dec - 10 Jan	Aer Lingus
07 Dec - 05 Jan	TAP
25 Dec - 08 Jan	SWISS
14 Dec - 02 Jan	Aer Lingus

Also check the deals for one-way flights from Washington 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 Washington to Barcelona in December from $424

Return flights