AirHint found the following cheapest return flights from Seattle (SEA) to Barcelona (BCN) in January 2026 (see full year).

Return flights

13 Jan - 20 Jan	Air Canada
20 Jan - 27 Jan	Air Canada
23 Jan - 30 Jan	Icelandair
27 Jan - 03 Feb	Air Canada
19 Jan - 26 Jan	Air Canada
22 Jan - 29 Jan	Air Canada
12 Jan - 19 Jan	Air Canada
26 Jan - 02 Feb	Air Canada
14 Jan - 21 Jan	Air Canada
21 Jan - 28 Jan	Air Canada
28 Jan - 04 Feb	Air Canada
18 Jan - 03 Feb	Lufthansa
24 Jan - 31 Jan	Air Canada
25 Jan - 01 Feb	Air Canada
29 Jan - 05 Feb	Air Canada
15 Jan - 22 Jan	Air Canada
30 Jan - 06 Feb	Icelandair
31 Jan - 07 Feb	Air Canada
22 Jan - 05 Feb	Lufthansa
20 Jan - 14 Feb	United

Also check the deals for one-way flights from Seattle to Barcelona in January.

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 Seattle to Barcelona in January from 325€

Return flights