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

Return flights

30 Dec - 09 Jan	United
08 Dec - 17 Dec	Air France
04 Dec - 08 Dec	United
03 Dec - 10 Dec	Aer Lingus
12 Dec - 19 Dec	Aer Lingus
06 Dec - 13 Dec	Aer Lingus
15 Dec - 22 Dec	Aer Lingus
23 Dec - 31 Dec	United
22 Dec - 28 Dec	Lufthansa
21 Dec - 28 Dec	Iberia
23 Dec - 30 Dec	Iberia
25 Dec - 01 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.

Book a cheap hotel in Dublin

Cheap car rent in Dublin

Cheapest return flights from St. Louis to Dublin in December from 427€

Return flights