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

Return flights

13 Aug - 20 Aug	Finnair	direct
06 Aug - 20 Aug	Finnair
06 Aug - 20 Aug	British Airways	direct
12 Aug - 21 Aug	Delta
17 Aug - 02 Sep	Delta
05 Aug - 21 Aug	Air France
11 Aug - 21 Aug	Delta
19 Aug - 26 Aug	Air France
03 Aug - 19 Aug	Delta
10 Aug - 28 Aug	Air France
06 Aug - 14 Aug	KLM
17 Aug - 02 Sep	British Airways	direct
27 Aug - 03 Sep	British Airways	direct
20 Aug - 03 Sep	Delta
01 Aug - 08 Sep	Virgin Atlantic
17 Aug - 01 Sep	Delta
27 Aug - 08 Sep	KLM
15 Aug - 02 Sep	Delta
17 Aug - 01 Sep	Finnair	direct
25 Aug - 01 Sep	British Airways	direct

Also check the deals for one-way flights from Phoenix to London 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 London in August from 420€

Return flights