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

Return flights

11 Dec - 18 Dec	United
01 Dec - 08 Dec	United
02 Dec - 13 Jan	United
01 Dec - 08 Dec	British Airways	direct
31 Dec - 07 Jan	United
02 Dec - 13 Jan	British Airways	direct
15 Dec - 21 Dec	United
11 Dec - 18 Dec	British Airways	direct
12 Dec - 30 Dec	Delta
31 Dec - 07 Jan	British Airways	direct
16 Dec - 23 Dec	Delta
15 Dec - 21 Dec	British Airways	direct
22 Dec - 01 Jan	United
18 Dec - 24 Dec	British Airways
21 Dec - 28 Dec	British Airways
15 Dec - 05 Jan	Delta
21 Dec - 05 Jan	Delta
15 Dec - 05 Jan	British Airways	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 538€

Return flights