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

Return flights

02 Dec - 09 Dec	KLM
01 Dec - 09 Dec	KLM
02 Dec - 10 Dec	KLM
01 Dec - 08 Dec	KLM
03 Dec - 10 Dec	Delta
03 Dec - 11 Dec	Delta
03 Dec - 09 Dec	Delta
14 Dec - 03 Jan	Scandinavian Airlines
09 Dec - 03 Jan	KLM
30 Dec - 02 Jan	Delta
27 Dec - 17 Jan	Air France
25 Dec - 03 Jan	Delta
20 Dec - 27 Dec	Delta
24 Dec - 03 Jan	Delta
23 Dec - 04 Jan	Delta
18 Dec - 10 Jan	KLM
20 Dec - 10 Jan	KLM
19 Dec - 10 Jan	KLM

Also check the deals for one-way flights from Dallas 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 Dallas to Lisbon in December from 419€

Return flights