AirHint found the following cheapest return flights from Houston (IAH) to Lisbon (LIS) in August 2025 (see full year).

Return flights

28 Aug - 04 Sep	Spirit Airlines
31 Aug - 14 Sep	Spirit Airlines
31 Aug - 07 Sep	Spirit Airlines
23 Aug - 25 Aug	Spirit Airlines
14 Aug - 19 Aug	British Airways
07 Aug - 14 Aug	Spirit Airlines
11 Aug - 16 Aug	Spirit Airlines

Also check the deals for one-way flights from Houston to Lisbon in August.

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 Lisbon in August from $697

Return flights