Cheapest return flights from Houston to Porto in September from $470

AirHint found the following cheapest return flights from Houston (HOU) to Porto (OPO) in September 2025 (see full year).

Return flights

22 Sep - 29 Sep Spirit Airlines
23 Sep - 30 Sep Spirit Airlines
24 Sep - 01 Oct Spirit Airlines
17 Sep - 24 Sep Spirit Airlines
30 Sep - 07 Oct Spirit Airlines
16 Sep - 23 Sep Spirit Airlines
25 Sep - 02 Oct Spirit Airlines
09 Sep - 16 Sep Spirit Airlines
15 Sep - 22 Sep Spirit Airlines
18 Sep - 25 Sep Spirit Airlines
21 Sep - 28 Sep Spirit Airlines
08 Sep - 15 Sep Spirit Airlines
29 Sep - 06 Oct Spirit Airlines
10 Sep - 17 Sep Spirit Airlines
27 Sep - 04 Oct Spirit Airlines
26 Sep - 03 Oct Spirit Airlines
28 Sep - 05 Oct Spirit Airlines

Also check the deals for one-way flights from Houston to Porto 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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