Cheapest return flights from Philadelphia to Lisbon in September from 569€

AirHint found the following cheapest return flights from Philadelphia (PHL) to Lisbon (LIS) in September 2025 (see full year).

Return flights

24 Sep - 30 Sep jetBlue
02 Sep - 30 Sep TAP
27 Sep - 11 Oct TAP
08 Sep - 15 Sep Frontier Airlines
10 Sep - 20 Sep Frontier Airlines
11 Sep - 23 Sep Aer Lingus
11 Sep - 20 Sep TAP
07 Sep - 14 Sep TAP
23 Sep - 05 Oct TAP
02 Sep - 28 Sep jetBlue
23 Sep - 30 Sep United
29 Sep - 06 Oct United
27 Sep - 11 Oct Iberia direct
20 Sep - 27 Sep United

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

Skyscanner

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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