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

Return flights

04 Aug - 15 Aug	KLM
24 Aug - 06 Sep	Delta
19 Aug - 26 Aug	American Airlines
15 Aug - 05 Sep	Spirit Airlines
25 Aug - 29 Aug	Spirit Airlines
06 Aug - 20 Aug	KLM
15 Aug - 19 Aug	American Airlines
27 Aug - 10 Sep	Frontier Airlines
29 Aug - 01 Sep	Frontier Airlines
28 Aug - 10 Sep	Spirit Airlines
08 Aug - 17 Aug	Frontier Airlines
01 Aug - 14 Aug	Frontier Airlines
27 Aug - 09 Sep	American Airlines
22 Aug - 14 Sep	Sun Country Airlines
01 Aug - 09 Aug	Alaska Airlines
01 Aug - 03 Aug	Spirit Airlines
01 Aug - 10 Aug	Icelandair

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 $481

Return flights