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Cheapest one-way flights from Philadelphia (PHL) to Lisbon (LIS), September

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Dates, airline, and price
Dates	Airline	Price
26 Sep	Frontier Airlines
27 Sep	Frontier Airlines
01 Sep	jetBlue
21 Sep	Frontier Airlines
16 Sep	Frontier Airlines
05 Sep	jetBlue
02 Sep	jetBlue
21 Sep	American Airlines Direct Flight
28 Sep	United
26 Sep	Finnair Direct Flight

deals for return flights from Philadelphia to Lisbon in September.

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Updated Jul 20, 2026.

About these fares

These results come from our latest search across airlines for your currency. Prices change quickly and are not locked until you complete booking—always confirm the total and fare rules on the partner site.

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Cheapest one-way flights from Philadelphia (PHL) to Lisbon (LIS), September

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