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

Return flights

22 Sep - 17 Oct	Lufthansa
23 Sep - 30 Sep	KLM
22 Sep - 30 Sep	Delta
30 Sep - 07 Oct	Air Canada
22 Sep - 08 Oct	British Airways	direct
29 Sep - 10 Oct	Delta
30 Sep - 25 Oct	Iberia
25 Sep - 05 Oct	Lufthansa
25 Sep - 30 Sep	Delta
29 Sep - 25 Oct	Air Canada
24 Sep - 28 Sep	Delta
20 Sep - 29 Sep	Delta
24 Sep - 18 Oct	United
20 Sep - 11 Oct	British Airways
27 Sep - 05 Oct	Iberia
18 Sep - 25 Sep	jetBlue
22 Sep - 25 Sep	Frontier Airlines
15 Sep - 21 Sep	Spirit Airlines
24 Sep - 27 Sep	Frontier Airlines
17 Sep - 30 Sep	jetBlue

Also check the deals for one-way flights from Phoenix to London 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 London in September from 413€

Return flights