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

Return flights

06 Dec - 10 Dec	Scandinavian Airlines
03 Dec - 10 Dec	British Airways
08 Dec - 15 Dec	British Airways
01 Dec - 08 Dec	British Airways
05 Dec - 12 Dec	Spirit Airlines
06 Dec - 13 Dec	Scandinavian Airlines
04 Dec - 11 Dec	Spirit Airlines
07 Dec - 14 Dec	British Airways
24 Dec - 29 Dec	British Airways
17 Dec - 21 Dec	British Airways
18 Dec - 10 Jan	Frontier Airlines
20 Dec - 01 Jan	Turkish Airlines
30 Dec - 03 Jan	Turkish Airlines

Also check the deals for one-way flights from Atlanta 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 Atlanta to Lisbon in December from $477

Return flights