Cheapest return flights from Seattle to Madrid in May from $538

AirHint found the following cheapest return flights from Seattle (SEA) to Madrid (MAD) in May 2026 (see full year).

Return flights

04 May - 15 May Air Canada
07 May - 14 May Iberia
05 May - 12 May Iberia
04 May - 11 May Iberia
12 May - 19 May Iberia
11 May - 18 May Iberia
06 May - 13 May Iberia
19 May - 26 May Iberia
14 May - 21 May Iberia
03 May - 10 May Iberia
27 May - 03 Jun Iberia
29 May - 05 Jun Iberia
28 May - 04 Jun Iberia
26 May - 02 Jun Iberia
25 May - 01 Jun Iberia
30 May - 06 Jun Iberia
31 May - 07 Jun Iberia

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

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