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

Return flights

05 Aug - 05 Sep	Spirit Airlines
17 Aug - 24 Aug	Frontier Airlines
04 Aug - 19 Aug	Air Canada
31 Aug - 05 Sep	Frontier Airlines
13 Aug - 19 Aug	Air Canada
10 Aug - 26 Aug	United
04 Aug - 20 Aug	United
12 Aug - 26 Aug	Air Canada
12 Aug - 18 Aug	Air Canada
30 Aug - 04 Sep	Spirit Airlines
19 Aug - 31 Aug	Air Canada
20 Aug - 31 Aug	Spirit Airlines
06 Aug - 12 Aug	Lufthansa
29 Aug - 03 Sep	jetBlue
29 Aug - 15 Sep	Spirit Airlines
30 Aug - 07 Sep	Frontier Airlines
22 Aug - 01 Sep	Frontier Airlines
29 Aug - 01 Sep	Frontier Airlines

Also check the deals for one-way flights from Atlanta to Lisbon in August.

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 August from $607

Return flights