Cheapest return flights from Houston to Porto in September from $669

AirHint found the following cheapest return flights from Houston (IAH) to Porto (OPO) in September 2026 (see full year).

Return flights

08 Sep - 15 Sep Turkish Airlines
07 Sep - 14 Sep Air France
18 Sep - 26 Sep Turkish Airlines
06 Sep - 13 Sep Air France
05 Sep - 12 Sep Air Canada

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

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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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