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

Return flights

29 Sep - 06 Oct	Iberia
28 Sep - 22 Oct	Frontier Airlines
30 Sep - 23 Oct	Air France
09 Sep - 16 Sep	United
16 Sep - 30 Sep	Delta
27 Sep - 03 Oct	British Airways
12 Sep - 04 Oct	Frontier Airlines
08 Sep - 04 Oct	British Airways
05 Sep - 12 Sep	United
05 Sep - 27 Sep	Frontier Airlines
11 Sep - 04 Oct	British Airways
11 Sep - 18 Sep	United
15 Sep - 22 Sep	United
25 Sep - 02 Oct	United
07 Sep - 14 Sep	United
23 Sep - 30 Sep	United
17 Sep - 24 Sep	United
13 Sep - 20 Sep	United

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

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 September from 576€

Return flights