Cheapest return PHL–LIS flights, May

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

Return flights

19 May - 26 May jetBlue
28 May - 04 Jun Frontier Airlines
24 May - 31 May Air Canada
21 May - 28 May Sun Country Airlines
24 May - 28 May Frontier Airlines
21 May - 26 May Sun Country Airlines
18 May - 25 May jetBlue
04 May - 10 May Frontier Airlines
23 May - 30 May WestJet
18 May - 22 May Frontier Airlines
22 May - 26 May Frontier Airlines

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

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