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

Return flights

02 Dec - 14 Dec	Delta
07 Dec - 14 Dec	Delta
15 Dec - 15 Jan	Delta
16 Dec - 15 Jan	Delta
14 Dec - 15 Jan	Delta
14 Dec - 22 Dec	Iberia
09 Dec - 16 Dec	Aer Lingus
01 Dec - 08 Dec	Aer Lingus
05 Dec - 12 Dec	Aer Lingus
11 Dec - 18 Dec	Aer Lingus
22 Dec - 15 Jan	United
23 Dec - 15 Jan	United
21 Dec - 15 Jan	United
17 Dec - 15 Jan	United
18 Dec - 15 Jan	Iberia
13 Dec - 20 Dec	Aer Lingus
19 Dec - 15 Jan	Delta
20 Dec - 15 Jan	Delta
23 Dec - 30 Dec	Aer Lingus
20 Dec - 27 Dec	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 413€

Return flights