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

Return flights

02 Sep - 15 Sep	Frontier Airlines
09 Sep - 17 Sep	Air Canada
08 Sep - 15 Sep	Frontier Airlines
23 Sep - 06 Oct	Scandinavian Airlines
03 Sep - 24 Sep	Air Canada
09 Sep - 17 Sep	Aer Lingus	direct
03 Sep - 24 Sep	Aer Lingus	direct
09 Sep - 16 Sep	Aer Lingus	direct
04 Sep - 11 Sep	Frontier Airlines
10 Sep - 22 Sep	Aer Lingus	direct
09 Sep - 29 Sep	Iberia
15 Sep - 09 Oct	Scandinavian Airlines
15 Sep - 09 Oct	Aer Lingus	direct
24 Sep - 01 Oct	Aer Lingus	direct
30 Sep - 07 Oct	Aer Lingus	direct
23 Sep - 06 Oct	Aer Lingus	direct

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 477€

Return flights