Cheapest return flights from St. Louis to Madrid in August from $639

AirHint found the following cheapest return flights from St. Louis (STL) to Madrid (MAD) in August 2025 (see full year).

Return flights

19 Aug - 26 Aug Air Canada
11 Aug - 26 Aug Air Canada
13 Aug - 20 Aug United
15 Aug - 22 Aug United
31 Aug - 07 Sep Iberia
17 Aug - 24 Aug Iberia
24 Aug - 31 Aug Air Canada
25 Aug - 01 Sep United
05 Aug - 12 Aug United
11 Aug - 18 Aug United
27 Aug - 03 Sep Iberia
07 Aug - 14 Aug Iberia
09 Aug - 16 Aug Iberia
29 Aug - 05 Sep United

Also check the deals for one-way flights from St. Louis to Madrid in August.

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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