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

Return flights

10 Sep - 16 Sep	British Airways	direct
08 Sep - 23 Sep	British Airways	direct
24 Sep - 18 Oct	Iberia
26 Sep - 05 Oct	Frontier Airlines
11 Sep - 25 Sep	Frontier Airlines
23 Sep - 30 Sep	jetBlue
20 Sep - 02 Oct	jetBlue
20 Sep - 29 Sep	jetBlue
10 Sep - 17 Sep	jetBlue
21 Sep - 29 Sep	jetBlue
30 Sep - 25 Oct	jetBlue
30 Sep - 04 Oct	jetBlue
20 Sep - 11 Oct	jetBlue
09 Sep - 04 Oct	jetBlue
07 Sep - 27 Sep	jetBlue
27 Sep - 06 Oct	Frontier Airlines
04 Sep - 10 Sep	jetBlue
13 Sep - 04 Oct	jetBlue
12 Sep - 04 Oct	jetBlue
15 Sep - 27 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 $514

Return flights