Cheapest return flights from Seattle to Barcelona in May from $671

Best time to book flights for Seattle (SEA) to Barcelona (BCN) flights at AirHint

AirHint found the following cheapest return flights from Seattle (SEA) to Barcelona (BCN) in May 2025 (see full year).

Return flights

10 May - 14 May Frontier Airlines
07 May - 11 May Icelandair
08 May - 14 May Icelandair
13 May - 25 May WestJet
03 May - 14 May Frontier Airlines
13 May - 20 May Icelandair
06 May - 20 May Icelandair
19 May - 31 May Icelandair
01 May - 05 May Icelandair
25 May - 07 Jun Icelandair
29 May - 08 Jun Icelandair
31 May - 08 Jun Icelandair
22 May - 26 May Icelandair
29 May - 09 Jun Icelandair
29 May - 07 Jun WestJet
31 May - 04 Jun Icelandair
27 May - 10 Jun Icelandair

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

Skyscanner

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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