Cheapest return flights from St. Louis to Madrid in May from $664

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

Return flights

09 May - 27 May British Airways
09 May - 26 May British Airways
09 May - 28 May British Airways
06 May - 15 May KLM
06 May - 10 May Frontier Airlines
09 May - 25 May British Airways
04 May - 11 May Iberia
09 May - 24 May British Airways
09 May - 17 May British Airways
09 May - 23 May British Airways
27 May - 03 Jun Iberia

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

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