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

Return flights

06 Sep - 12 Sep	Frontier Airlines
05 Sep - 08 Sep	Frontier Airlines
04 Sep - 08 Sep	Frontier Airlines
26 Sep - 04 Oct	Spirit Airlines
20 Sep - 27 Sep	Spirit Airlines
11 Sep - 14 Sep	Spirit Airlines
08 Sep - 14 Sep	Spirit Airlines
21 Sep - 30 Sep	Turkish Airlines
01 Sep - 08 Sep	Frontier Airlines
25 Sep - 29 Sep	Spirit Airlines
26 Sep - 29 Sep	Frontier Airlines

Also check the deals for one-way flights from Houston 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 Houston to Dublin in September from $557

Return flights