Cheapest return flights from Philadelphia to Lisbon in September from 561€

Best time to book flights for Philadelphia (PHL) to Lisbon (LIS) flights at AirHint

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

Return flights

17 Sep - 24 Sep Finnair
17 Sep - 24 Sep Finnair direct
25 Sep - 02 Oct United
04 Sep - 11 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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