Cheapest return flights from Washington to Madrid in September from $451

AirHint found the following cheapest return flights from Washington (IAD) to Madrid (MAD) in September 2026 (see full year).

Return flights

21 Sep - 29 Sep Finnair direct
02 Sep - 12 Sep TAP
09 Sep - 15 Sep TAP
10 Sep - 24 Sep TAP
18 Sep - 25 Sep Finnair direct
09 Sep - 15 Sep British Airways direct
02 Sep - 12 Sep Iberia direct
04 Sep - 12 Sep TAP
04 Sep - 12 Sep Iberia direct
10 Sep - 24 Sep Finnair direct

Also check the deals for one-way flights from Washington to Madrid in September.

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