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

Return flights

02 Dec - 10 Dec	United
08 Dec - 17 Dec	Air France
30 Dec - 09 Jan	Iberia
02 Dec - 09 Dec	Aer Lingus
05 Dec - 12 Dec	Aer Lingus
08 Dec - 15 Dec	Aer Lingus
11 Dec - 18 Dec	Aer Lingus
14 Dec - 21 Dec	Aer Lingus
28 Dec - 04 Jan	Aer Lingus

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

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 St. Louis to Dublin in December from $487

Return flights