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

Return flights

09 Mar - 23 Mar	Condor
04 Mar - 11 Mar	Iberia
09 Mar - 16 Mar	Iberia
06 Mar - 13 Mar	Iberia
11 Mar - 18 Mar	Iberia
12 Mar - 04 Apr	Condor
10 Mar - 17 Mar	Iberia
01 Mar - 08 Mar	Iberia
18 Mar - 28 Mar	British Airways
31 Mar - 25 Apr	Turkish Airlines
29 Mar - 18 Apr	Turkish Airlines
25 Mar - 01 Apr	Iberia
16 Mar - 23 Mar	Iberia
23 Mar - 30 Mar	Iberia
28 Mar - 18 Apr	Turkish Airlines
31 Mar - 07 Apr	Iberia
26 Mar - 02 Apr	Iberia
27 Mar - 03 Apr	Iberia
30 Mar - 06 Apr	Iberia
29 Mar - 05 Apr	Iberia

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

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 Madrid in March from $510

Return flights