Cheapest return flights from St. Louis to Barcelona in December from $438

AirHint found the following cheapest return flights from St. Louis (STL) to Barcelona (BCN) in December 2025 (see full year).

Return flights

02 Dec - 09 Dec Delta
03 Dec - 10 Dec United
05 Dec - 12 Dec United
01 Dec - 08 Dec United
29 Dec - 24 Jan Air Canada
12 Dec - 19 Dec British Airways
31 Dec - 07 Jan United
26 Dec - 17 Jan Iberia
26 Dec - 30 Dec Lufthansa
23 Dec - 30 Dec United
25 Dec - 01 Jan United
21 Dec - 28 Dec United
28 Dec - 04 Jan United

Also check the deals for one-way flights from St. Louis to Barcelona in December.

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