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

Return flights

19 Aug - 27 Aug	Spirit Airlines
31 Aug - 14 Sep	Spirit Airlines
20 Aug - 27 Aug	Spirit Airlines
31 Aug - 22 Sep	Spirit Airlines
12 Aug - 19 Aug	Air Canada
10 Aug - 21 Aug	Turkish Airlines
03 Aug - 21 Aug	Turkish Airlines
31 Aug - 07 Sep	Spirit Airlines
17 Aug - 24 Aug	Spirit Airlines
14 Aug - 19 Aug	Air Canada
29 Aug - 06 Sep	Spirit Airlines
01 Aug - 09 Aug	Frontier 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 $676

Return flights