Cheapest return ATL–LIS flights, May

AirHint found the following cheapest return flights from Atlanta (ATL) to Lisbon (LIS) in May 2026 (see full year).

Return flights

31 May - 06 Jun Frontier Airlines
23 May - 01 Jun Frontier Airlines
29 May - 02 Jun Air Canada
18 May - 26 May Frontier Airlines
18 May - 06 Jun Frontier Airlines
14 May - 24 May Frontier Airlines
15 May - 22 May Delta
16 May - 23 May Frontier Airlines
22 May - 31 May Frontier Airlines
21 May - 25 May WestJet
20 May - 28 May Frontier Airlines
25 May - 31 May Frontier Airlines

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

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