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

Return flights

24 Dec - 07 Jan	jetBlue
29 Dec - 05 Jan	Allegiant Air
30 Dec - 05 Jan	Frontier Airlines
27 Dec - 08 Jan	Frontier Airlines
31 Dec - 04 Jan	Allegiant Air
23 Dec - 28 Dec	Frontier Airlines
29 Dec - 04 Jan	Brussels Airlines
27 Dec - 03 Jan	jetBlue
26 Dec - 04 Jan	jetBlue
27 Dec - 04 Jan	jetBlue
24 Dec - 04 Jan	Frontier Airlines
26 Dec - 28 Dec	Delta
23 Dec - 26 Dec	KLM
23 Dec - 28 Dec	British Airways	direct
23 Dec - 26 Dec	Finnair	direct

Also check the deals for one-way flights from Phoenix to London in December.

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 December from 836€

Return flights