AirHint found the following cheapest return flights from Phoenix (PHX) to Lisbon (LIS) in August 2025 (see full year).

Return flights

18 Aug - 03 Sep	Air Canada
19 Aug - 26 Aug	Air Canada
13 Aug - 20 Aug	Lufthansa
11 Aug - 21 Aug	Air Canada
09 Aug - 20 Aug	British Airways
19 Aug - 31 Aug	Iberia
18 Aug - 25 Aug	United
07 Aug - 12 Aug	United
30 Aug - 13 Sep	Delta
14 Aug - 21 Aug	United
26 Aug - 02 Sep	United
12 Aug - 19 Aug	United
20 Aug - 27 Aug	United
29 Aug - 08 Sep	WestJet
30 Aug - 06 Sep	United
28 Aug - 04 Sep	United

Also check the deals for one-way flights from Phoenix to Lisbon in August.

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 Phoenix to Lisbon in August from $641

Return flights