AirHint found the following cheapest return flights from Washington (DCA) to Dublin (DUB) in September 2025 (see full year).

Return flights

07 Sep - 16 Sep	jetBlue
06 Sep - 27 Sep	jetBlue
06 Sep - 12 Sep	jetBlue
04 Sep - 11 Sep	jetBlue
08 Sep - 15 Sep	jetBlue
11 Sep - 16 Sep	jetBlue
10 Sep - 15 Sep	jetBlue
27 Sep - 07 Oct	jetBlue
05 Sep - 27 Sep	jetBlue
15 Sep - 18 Sep	jetBlue
16 Sep - 19 Sep	jetBlue
21 Sep - 11 Oct	jetBlue
27 Sep - 18 Oct	jetBlue
16 Sep - 11 Oct	jetBlue
18 Sep - 02 Oct	jetBlue
26 Sep - 03 Oct	jetBlue
30 Sep - 13 Oct	jetBlue
22 Sep - 18 Oct	jetBlue
28 Sep - 06 Oct	jetBlue
24 Sep - 09 Oct	jetBlue

Also check the deals for one-way flights from Washington to Dublin in September.

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 Washington to Dublin in September from $505

Return flights