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

Return flights

27 Jan - 12 Feb	Frontier Airlines
28 Jan - 13 Feb	Air Canada
28 Jan - 04 Feb	Air Canada
27 Jan - 06 Feb	Delta
27 Jan - 11 Feb	Delta
27 Jan - 10 Feb	Delta
28 Jan - 10 Feb	Delta
27 Jan - 09 Feb	Iberia
29 Jan - 13 Feb	Air Canada
27 Jan - 07 Feb	Delta
19 Jan - 26 Jan	Spirit Airlines
22 Jan - 31 Jan	Air Canada
19 Jan - 28 Jan	Frontier Airlines
25 Jan - 28 Jan	Spirit Airlines
19 Jan - 28 Jan	Iberia	direct
19 Jan - 26 Jan	Iberia	direct

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

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 January from 485€

Return flights