Cheapest return flights from Washington to Dublin in September from $409

Best time to book flights for Washington (IAD) to Dublin (DUB) flights at AirHint

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

Return flights

09 Sep - 19 Sep Aer Lingus direct
10 Sep - 24 Sep Aer Lingus direct
03 Sep - 10 Sep Aer Lingus direct
25 Sep - 09 Oct TAP
25 Sep - 04 Oct Icelandair
25 Sep - 02 Oct Icelandair
21 Sep - 27 Sep Icelandair
26 Sep - 29 Sep Icelandair
25 Sep - 16 Oct TAP
29 Sep - 06 Oct Icelandair
04 Sep - 25 Sep Aer Lingus direct
18 Sep - 25 Sep Icelandair
08 Sep - 15 Sep Aer Lingus direct
01 Sep - 06 Sep Icelandair
06 Sep - 15 Sep Icelandair
11 Sep - 02 Oct Icelandair
25 Sep - 09 Oct Aer Lingus direct
28 Sep - 05 Oct Aer Lingus direct
29 Sep - 06 Oct Aer Lingus direct
25 Sep - 02 Oct Aer Lingus direct

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

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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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