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

Return flights

09 Dec - 16 Dec	Air Canada
02 Dec - 09 Dec	Air Canada
03 Dec - 10 Dec	Air Canada
10 Dec - 17 Dec	Air Canada
01 Dec - 08 Dec	Air Canada
08 Dec - 15 Dec	Air Canada
04 Dec - 11 Dec	Delta
07 Dec - 14 Dec	Delta
16 Dec - 23 Dec	Air Canada
11 Dec - 18 Dec	Air Canada
31 Dec - 10 Jan	United
31 Dec - 07 Jan	British Airways
30 Dec - 06 Jan	British Airways
29 Dec - 05 Jan	Air France
25 Dec - 01 Jan	Delta
28 Dec - 04 Jan	British Airways
27 Dec - 03 Jan	British Airways
26 Dec - 02 Jan	British Airways
26 Dec - 04 Jan	British Airways
20 Dec - 05 Jan	British Airways

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

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 December from 454€

Return flights