AirHint found the following cheapest return flights from Washington (IAD) to Dublin (DUB) in September 2026 (see full year).

Return flights

03 Sep - 08 Sep	Iberia
03 Sep - 07 Sep	Iberia
04 Sep - 10 Sep	Air France
04 Sep - 07 Sep	Aer Lingus	direct
28 Sep - 10 Oct	Scandinavian Airlines
06 Sep - 13 Sep	United	direct
17 Sep - 25 Sep	Aer Lingus	direct
28 Sep - 10 Oct	Iberia	direct
03 Sep - 08 Sep	United	direct
04 Sep - 10 Sep	Aer Lingus	direct
03 Sep - 07 Sep	United	direct
26 Sep - 10 Oct	KLM
26 Sep - 10 Oct	United	direct

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.

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Cheapest return flights from Washington to Dublin in September from 399€

Return flights