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

Return flights

04 Jul - 09 Jul	TAP
15 Jul - 31 Jul	TAP
10 Jul - 16 Jul	jetBlue
18 Jul - 30 Jul	jetBlue
25 Jul - 27 Jul	Spirit Airlines
16 Jul - 23 Jul	TAP
10 Jul - 17 Jul	jetBlue
09 Jul - 13 Jul	Spirit Airlines
04 Jul - 11 Jul	TAP
17 Jul - 31 Jul	jetBlue
29 Jul - 05 Aug	United
25 Jul - 01 Aug	United
27 Jul - 03 Aug	United
31 Jul - 07 Aug	United

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

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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Cheapest return flights from Philadelphia to Lisbon in July from $876

Return flights