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

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

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

Return flights

29 Sep - 22 Oct Scandinavian Airlines
04 Sep - 24 Sep Scandinavian Airlines
10 Sep - 01 Oct Scandinavian Airlines
05 Sep - 24 Sep Scandinavian Airlines
01 Sep - 10 Sep Icelandair
03 Sep - 24 Sep Scandinavian Airlines
09 Sep - 01 Oct Scandinavian Airlines
11 Sep - 25 Sep Scandinavian Airlines
12 Sep - 21 Sep Scandinavian Airlines
11 Sep - 15 Sep Scandinavian Airlines
26 Sep - 29 Sep Icelandair
01 Sep - 08 Sep Icelandair
23 Sep - 27 Sep Icelandair
09 Sep - 01 Oct Aer Lingus direct
10 Sep - 01 Oct Aer Lingus direct
29 Sep - 22 Oct Aer Lingus direct

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

Skyscanner

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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