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

Return flights

13 Dec - 16 Dec	TAP	direct
10 Dec - 13 Dec	Lufthansa
01 Dec - 31 Dec	British Airways
02 Dec - 01 Jan	British Airways
23 Dec - 27 Dec	Delta
24 Dec - 28 Dec	Delta
23 Dec - 31 Dec	Iberia
18 Dec - 25 Dec	Delta
22 Dec - 30 Dec	Air Canada
02 Dec - 01 Jan	TAP	direct
20 Dec - 03 Jan	British Airways
23 Dec - 27 Dec	TAP	direct
20 Dec - 03 Jan	TAP	direct
19 Dec - 03 Jan	Air France

Also check the deals for one-way flights from Los Angeles 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 Los Angeles to Lisbon in December from 429€

Return flights