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

Return flights

29 Jul - 03 Aug	Spirit Airlines
14 Jul - 22 Jul	Spirit Airlines
17 Jul - 24 Jul	Spirit Airlines
25 Jul - 28 Jul	Spirit Airlines
18 Jul - 29 Jul	Spirit Airlines
18 Jul - 01 Aug	Spirit Airlines
23 Jul - 30 Jul	United

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

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 July from $919

Return flights