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

Return flights

14 Sep - 24 Sep	SWISS
29 Sep - 25 Oct	Scandinavian Airlines
10 Sep - 17 Sep	jetBlue
28 Sep - 07 Oct	SWISS
16 Sep - 23 Sep	SWISS
17 Sep - 22 Sep	Scandinavian Airlines
14 Sep - 23 Sep	SWISS
17 Sep - 21 Sep	Flair Airlines
16 Sep - 23 Sep	Aer Lingus	direct
15 Sep - 09 Oct	Aer Lingus	direct
22 Sep - 02 Oct	Aer Lingus	direct
22 Sep - 02 Oct	SWISS
25 Sep - 07 Oct	Frontier Airlines
22 Sep - 25 Sep	WestJet
21 Sep - 25 Sep	Frontier Airlines
24 Sep - 30 Sep	Frontier Airlines
29 Sep - 06 Oct	Aer Lingus	direct
28 Sep - 18 Oct	United
22 Sep - 18 Oct	United
24 Sep - 05 Oct	Frontier Airlines

Also check the deals for one-way flights from San Francisco 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 San Francisco to Dublin in September from 514€

Return flights